Carpenter Electrification Blog

High-Strength Hiperco® with Low Core Loss: Meeting the Demands of High-Speed Motor Design

Carpenter Electrification — Wed, 15 Apr 2026 14:30:00 GMT

The challenge of high-speed electric motor design: choosing between electrical efficiency and mechanical strength. New high strength with low cores loss motor stacks, Hiperco® Prime and Hiperco® Prime Plus eliminate this compromise with dual materials from a single strip, one optimized for stators with 30% lower core loss, another for rotors with >400 MPa yield strength.

The Result: 2-5% higher continuous power and 100°F lower operating temperatures.

The electrification revolution continues accelerating across industries, from aerospace to automotive, and from defense to industrial applications. As designers push the boundaries of what's possible with electric motors, a fundamental materials challenge has emerged: the need for stator and rotor stacks that can deliver exceptional electrical efficiency and the mechanical strength required for high-speed and high-torque operation.

The Materials Challenge in Power Dense Motor Design

Traditional electric motor design has forced engineers to make difficult trade-offs. They could choose materials with excellent motor design for high power density motors to maximize efficiency, but with insufficient mechanical strength for high-speed rotors. Alternatively, they could opt for materials with adequate yield strength but compromised efficiency. This compromise directly impacts power output, operational temperatures, and ultimately, the performance envelope of the entire system.

This compromise has become increasingly untenable for applications where every percentage of efficiency and every gram of weight matters. The movement toward high power density motors has created a critical need for high-strength soft magnetic materials, specifically those with yield strength exceeding 400 MPa for rotor stack components.

Understanding Hiperco® Technology

Carpenter Electrification's Hiperco® family represents the gold standard for high-induction soft magnetic alloys. These iron-cobalt alloys consistently deliver approximately 25% higher torque density and 25% higher power density for motors and generators compared to silicon steel alternatives.

However, even industry-leading materials face limitations: Grades that deliver very low core loss typically cannot provide the >400 MPa yield strength required for rotor integrity. This limitation can constrain the potential of next-generation power dense motor designs.

Prime and Prime Plus: Two Specialized Grades from One Material

Recent advances have led to the development of two specialized products. Hiperco® Prime and Hiperco® Prime Plus, created from the same strip material through a proprietary manufacturing process. This cutting-edge technology tailors the material's properties to specific application requirements.

Hiperco Prime Plus - Stator-Optimized Stacks: These stacks deliver approximately 30% lower core loss compared to stators produced with standard Hiperco®. The reduced loss translates directly to increased power density and significantly cooler operating temperatures, critical advantages for maintaining system reliability and extending component life.
Hiperco Prime - Rotor-Optimized Stacks: These complementary stacks provide yield strength exceeding 400 MPa and up to 500 MPa, delivering the mechanical robustness essential for reliable high-speed operation. This enables motors to operate at higher rotational speeds and higher torque, extracting more power from the same form factor.

Both stator and rotor stacks maintain Hiperco®'s signature high induction properties, ensuring that designers don't sacrifice the fundamental magnetic advantages that have made these materials indispensable in high-performance solutions.

Measurable Performance Advantages

The performance benefits of High-Strength Hiperco® grades are quantifiable and significant:

2-5% higher continuous motor power — extracting more output from the same motor size
Approximately 30% lower core loss — significantly improving motor efficiency
100°F lower motor operational temperature — enhancing reliability and extending component life
Enhanced mechanical strength for high torque and high rotational speeds — enabling operation in previously unattainable performance regimes

These advantages translate to real-world benefits across diverse applications:

Aerospace and eVTOL: Higher power density means increased passenger capacity and extended flight range without adding battery weight, critical factors in the emerging urban air mobility market.
Defense Systems: Significantly lower operating temperatures enhance reliability in mission-critical applications where failure is not an option, while reduced weight and volume create cascading benefits throughout the platform.
Medical Systems: Surgical robots and surgical power tools incorporate miniaturized motors that often operate at very high rotational speeds.

Proprietary Advanced Processing Methodology

The key to this breakthrough lies in the proprietary processing and stack level testing used to manufacture and certify Hiperco Prime and Hiperco Prime Plus. This innovative manufacturing approach creates two specialized grades from the same material, each optimized for its specific role within the electromagnetic system.

By precisely controlling the thermal and mechanical properties during processing, the lamination stacks can be tailored to maximize yield strength or minimize core losses, depending on the application requirements.

This dual-grade approach ensures perfect compatibility between stator and rotor components while eliminating the traditional compromise between mechanical strength, core loss, and efficiency. The ability to produce variations from the same material streamlines supply chains and ensures consistent quality from a single source.

Our unique finished stack testing methodology ensures stators and rotors perform as designed, a significant advancement from ASTM loose ring testing standard in the industry.

Implementation Considerations

The implementation of High-Strength Hiperco® grades requires thoughtful design consideration to realize their full potential:

For Stator Applications — The low-loss grade maximizes efficiency in stator stacks, reducing waste heat and enabling more compact designs with enhanced cooling requirements. This is particularly valuable in applications where thermal management is a critical design constraint.
For Rotor Applications — The high-strength grade maintains mechanical integrity at elevated speeds and under high loads, enabling reliable operation in power dense motor designs that extract maximum performance from the system. This is especially important for aerospace and defense applications where rotational speeds moving to higher frequency designs can exceed 20,000 RPM.

Technical Expertise and Support

Hiperco® Prime and Hiperco Prime Plus stacks are the result of over 80 years of specialized expertise in soft magnetics. These innovative stators and rotors represent more than just raw materials; they offer comprehensive solutions from concept to scale-up. Our technical experts are available to provide guidance and support at every stage of the process, ensuring successful implementation and optimal performance.

The vertical integration in production ensures consistent quality from melt to final product, with advanced vacuum induction melting capacity, state-of-the-art processing equipment and novel stack testing capabilities - supporting these materials' development and production.

Looking Ahead

Hiperco® Prime and Hiperco® Prime Plus rotor stacks represent a significant milestone in the evolution of electric motor design. By eliminating the traditional compromise between electrical efficiency and mechanical strength, these materials enable the next generation of high-performance motors and generators.

Hiperco® Prime Plus: Redefining Stator Efficiency in High-Performance Motors

Carpenter Electrification — Wed, 01 Apr 2026 14:00:02 GMT

As electric motors push into higher power densities, thermal management has become the critical bottleneck limiting performance. Every watt lost to core losses becomes heat that must be managed, directly impacting system reliability and efficiency. In aerospace, defense, and medical and advanced industrial applications, thermal constraints often determine the ultimate performance ceiling.

The challenge intensifies at higher frequencies and flux densities. Most designers opt for alloys such as Carpenter Electrification’s Hiperco 50 for power dense motors. In motors and generators, these iron-cobalt grades have been proven to offer 25% higher torque density and 25% higher power density as compared to silicon-iron grades. However, despite their impressive performance, iron-cobalt grades with very low loss were limited in yield strength. This limitation posed a challenge for applications requiring both high strength and low loss. Hiperco Prime, produced using proprietary processing methods, resolves this limitation for stator stack components.

Understanding Core Loss and Its Impact

Core loss represents wasted energy that manifests as heat in the stator core. These losses increase with operating frequency and magnetic flux density. Even minor improvements in core loss yield significant benefits in power density, efficiency, and thermal management.

For stator applications, minimizing core loss is paramount. The stator experiences the full alternating magnetic field at operating frequency, making it the primary source of magnetic losses. A material that maintains high magnetic induction while dramatically reducing these losses represents a breakthrough in motor design.

Hiperco® Prime Plus: A New Benchmark for Stator Materials

Hiperco® Prime Plus is a specialized iron-cobalt alloy engineered for stator applications where efficiency and thermal performance are critical. This material delivers approximately 30% lower core loss compared to standard Hiperco® grades while maintaining high magnetic induction properties.

Hiperco® Prime Plus is manufactured using proprietary processing techniques that result in optimal properties. This new alloy provides the required yield strength for stators and significantly reduces both hysteresis and eddy current losses without compromising magnetic saturation.

Quantifiable Performance Advantages

The performance improvements of Hiperco® Prime Plus translate directly to measurable benefits:

Efficiency Gains: 25% reduction in core loss means more electrical energy converts to mechanical power. This translates to 2-5% higher continuous power output from the same form factor, as compared to standard Hiperco at the same yield strength.
Power Density: Prime Plus supports higher speed and higher frequency applications. The core loss benefits translate to 2-5% higher continuous power output and ~25% more torque density from the same form factor.
Thermal Benefits: Lower losses mean lower motor temperatures, with up to 100F reduction in operating temperatures, with cascading benefits in higher continuous power and reduced cooling requirements.
Reliability: Cooler operation directly improves reliability and component life. Reduced thermal cycling stress can extend maintenance intervals.

Application Specific Benefits

Hiperco® Prime Plus creates transformative improvements across multiple industries:

Aerospace and eVTOL: Enables compact generator and motor designs with reduced cooling requirements. Improved propulsion motor performance directly impacts range and payload capacity. For eVTOL applications, efficiency improvements extend flight time or increase passenger capacity.
Defense Systems: Enables high-speed generators and motors for aircraft, weaponry, and naval power systems where performance is non-negotiable.
Medical Systems: Surgical robots and surgical power tools incorporate miniaturized motors that often operate at very high rotational speeds.

Design Considerations for Implementation

Several factors maximize the benefits of Hiperco® Prime Plus:

Lamination Thickness: Available in various thicknesses to optimize the balance between eddy current losses and manufacturing. Thinner laminations further reduce high-frequency losses.
Stacking Factors: Excellent process control of lamination surface quality, staking and adhesive enables high stacking factors, maximizing active magnetic material.
Thermal Design: While Prime Plus reduces heat generation, thermal design should still be optimized to leverage cooler operation. Thermal management with either passive or active cooling approaches may be possible, depending upon motor design.
Frequency Optimization: Low-loss characteristics are particularly advantageous at higher frequencies, ideal for high-speed motor designs.

Manufacturing and Quality Considerations

Hiperco® Prime Plus is produced through controlled processes, ensuring consistent properties. The proprietary manufacturing process creates an alloy with optimal combination of magnetic and mechanical performance.

The material maintains excellent punchability and fabrication characteristics for complex stator geometries. Compatibility with standard manufacturing processes allows scale-up without significant production changes.

Our proprietary finished stack testing methodology ensures stators and rotors perform as designed. This approach represents a significant advancement over ASTM loose ring testing commonly used in the industry to certify material properties.

The Path Forward

Hiperco® Prime Plus advances stator material technology, enabling designs previously constrained by thermal limitations. By reducing core losses while maintaining high induction, and the required tensile strength, this material opens new possibilities across industries, from aerospace propulsion to defense systems to advanced medical and industrial applications providing the foundation for more powerful motors that run cooler, more efficiently, and more reliably.

Hiperco Prime Plus advances the state-of-the-art in power dense motor performance, with 30% lower core loss and ~25% higher torque density as compared to standard Hiperco.

Hiperco® Prime: Engineering High-Strength Solutions for High-Speed Rotor Applications

Carpenter Electrification — Thu, 19 Mar 2026 16:00:00 GMT

In today's rapidly evolving technological landscape, the demand for high-speed motors with increased power density is on the rise. This shift is driven by the need for more efficient and powerful machines that can meet the growing demands of various industries.

The pursuit of higher power density drives motors and generators to rotational speeds beyond 20,000 RPM. At these speeds, centrifugal forces create extreme demands on material strength. Materials must maintain excellent magnetic properties while withstanding mechanical stresses.

Most designers opt for alloys such as Carpenter Electrification’s Hiperco® 50 for power dense motors. In motors and generators, these iron-cobalt grades have been proven to offer 25% higher torque density and 25% higher power density as compared to silicon-iron grades. However, despite their impressive performance, iron-cobalt grades with very low loss had limitations in yield strength beyond 400MPa. This limitation posed a challenge for applications requiring both high strength and low loss. Hiperco® Prime, produced using proprietary processing methods, resolves this limitation for rotor stack components.

Understanding Rotor Stress in High-Speed Motors

Centrifugal forces increase with the square of rotational speed, creating tensile stresses exceeding conventional materials' yield strength. Stresses peak at the rotor's outer diameter and in bridge or web sections.

The critical threshold for advanced designs is yield strength exceeding 400 MPa. This enables reliable operation at speeds that extract maximum power from a given frame size, crucial where weight and volume are at a premium.

Hiperco® Prime: Strength Meets Magnetic Excellence

Hiperco® Prime delivers yield strength exceeding 400 MPa and up to 550 MPa, while maintaining the superior magnetic properties of iron-cobalt alloys. This specialized grade is engineered for rotor applications where mechanical integrity at high speeds is paramount.

Hiperco® Prime is manufactured using proprietary processing techniques that result in optimal alloy properties. The material withstands extreme mechanical stresses while enhancing the magnetic characteristics essential for motor performance.

Our proprietary finished stack testing methodology ensures stators and rotors perform as designed. This approach represents a significant advancement over ASTM loose ring testing commonly used in the industry to certify material properties.

Performance Capabilities and Benefits

Hiperco® Prime delivers multiple performance advantages:

Mechanical Performance: Yield strength >400 MPa enables safe operation at high rotational speeds, providing a substantial safety margin for critical applications.
Magnetic Properties: Maintains high magnetic induction and delivers 30%-35% lower core loss in combination with the exceptional strength.
Speed and Power Density: Higher speeds translate to increased power density—motors operating at higher RPM deliver more power in the same frame size. Hiperco® Prime provides an additional 2%-5% of power density in rotor stacks as compared to standard Hiperco®.

Application Advantages Across Industries

The combination of strength and magnetic performance delivers benefits across diverse sectors:

Aerospace: Enables more compact, lighter electrical power generators and eVTOL propulsion motors. The performance benefits can be realized in either high speed or high torque motor designs.
Defense Systems: Enables high-speed generators and motors for aircraft, weaponry, and naval power systems where performance is non-negotiable.
Medical Systems: Surgical robots and surgical power tools incorporate miniaturized motors that often operate at very high rotational speeds.

Design Implementation Strategies

Successful implementation requires consideration of key factors:

Rotor Architecture: High strength enables aggressive designs that optimize magnetic performance while maintaining mechanical integrity.
Speed Rating: The >400 MPa yield strength should be considered with proper safety factors. FEA optimizes geometry while maintaining safety margins.
Thermal Management: Managing heat is a significant challenge in power dense motors. High strength materials with low core loss help minimize heat generation, simplifying motor cooling requirements.
Manufacturing Precision: Proprietary processing steps support the tight dimensional tolerances required for high-speed operation and high rotor-stator induction. Tight tolerance are critical to power dense motor performance.

Enabling the Future

Hiperco® Prime is an enabling technology for next-generation high-speed electric machines. Breaking through 400 MPa while enhancing magnetic properties removes fundamental constraints on motor performance. As power density demands intensify, this material becomes an essential building block for advanced electrification, positioning designers to push boundaries in electric motor technology.

The Future of Air Travel: What 2025 Taught Us — and What’s Ahead in 2026

Carpenter Electrification — Fri, 12 Dec 2025 03:33:25 GMT

As 2025 comes to a close, the aviation industry finds itself at a meaningful inflection point. The past year brought real progress toward electrification, sustainability, and smarter aircraft design — while also revealing the practical challenges that still stand in the way of widespread adoption.

From electric aircraft development to new materials, propulsion systems, and manufacturing capabilities, air travel is no longer evolving in theory. It’s evolving in practice.

Here’s a look at what we learned in 2025 — and what’s shaping the future of air travel in 2026 and beyond.

2025 Industry Milestones

The electric aviation sector is poised for significant advancement in 2025, with several major milestones on the horizon. Leading manufacturers like Joby Aviation and Archer Aviation are finalizing certification processes for their commercial eVTOL aircraft, with expected launches in key urban markets by the end of this year. These certifications represent a crucial step toward the mainstream adoption of electric aviation. Companies in the regional air mobility sector are making substantial progress on electric aircraft designed for routes under 250 miles. Beta Technologies' ALIA eCTOL aircraft is scheduled for commercial service implementation across multiple cities.

The supply chain is rapidly evolving to support this growth, with major aerospace manufacturers increasing their investment in electrification. Industry data suggests a 40% year-over-year increase in the adoption of electric propulsion systems throughout the aerospace supply chain. Safran recently obtained EASA certification for a 120kW electric motor to replace the gas engine for propeller airplanes and is working on larger motors. Specialized manufacturing facilities for electric aircraft components are expected to double by 2025. This acceleration is particularly evident in motor and battery production, where new facilities are explicitly optimized for aviation-grade electric components.

Our advanced alloys, strip processing expertise, and stack production capability
enable these transformations, providing the foundation for lighter, more efficient electric aircraft. Our Hiperco® alloy technology is already integrated into several pioneering aircraft designs, supporting their certification processes through superior motor performance and reliability. The material's unique properties have proven essential for achieving the power density requirements necessary for commercial viability, while our optimized manufacturing processes are helping scale production to meet growing industry demand.

What to Know About eVTOLs

Let’s circle back to discuss this type of aviation in more detail. eVTOL aircraft use electric propulsion to take off and land vertically (like a helicopter), eliminating the need for extensive runway infrastructure. This technology is advancing aviation by making it more efficient, convenient, and environmentally friendly.

The electric motors in these aircraft, particularly those built with high-induction soft magnetic alloys and stacks, have a high power-to-weight ratio, making eVTOL aircraft highly efficient during power-intensive phases like takeoff, hover, and landing. After takeoff, eVTOLs transition into an efficient cruise mode like an airplane. This combination of features makes them ideal for short-range transit in dense urban environments that airplanes cannot access and where helicopters have been too disruptive to gain wide popularity.

One of the most notable features of electric aircraft is their quiet operation. Traditional aircraft powered by combustion engines generate a lot of noise due to the explosion of fuel and air mixture in the cylinders and the high-speed exhaust gasses. Electric motors are virtually silent, with most of the noise generated by air disturbance from the propellers. This significantly reduces noise pollution, making electric aircraft ideal for urban environments where noise can be a significant issue. Furthermore, using multiple smaller motors and propellers in eVTOLs, a concept known as distributed propulsion, can further reduce noise levels compared to a single large motor and propeller system.

Electric aircraft also stand out for their reduced maintenance needs, energy efficiency, flexibility in design, and potential for regenerating energy in flight. With significantly fewer moving parts than combustion engines, electric motors experience low wear and tear, leading to low maintenance costs and high reliability. They are often used in direct drive configurations, eliminating the complexity and weight of a gearbox —their high-efficiency results in less energy waste and lower operating costs. The compact and flexible nature of the electric motors allows for innovative aircraft designs, enhancing functionality and efficiency. Lastly, the potential for regenerating energy in-flight could further increase the efficiency of electric aircraft by using the electric motor as a generator during cruise in some aircraft designs.

For manufacturers developing next-generation aircraft for 2025 and beyond, Carpenter Electrification's soft magnetic alloys and optimized stack processing are critical enablers (as noted earlier). Our Hiperco® alloys directly address key challenges in electric aviation, particularly in power density and efficiency. For detailed technical specifications, visit our comprehensive datasheets for electric aircraft applications.

Hiperco®, a high cobalt alloy used in stators and rotors, is ideal for aircraft propulsion systems. This alloy strikes the essential balance between power and weight for electric motors, providing 30% higher power density and increased motor efficiency by up to 3%. This means an identically sized motor can have 25% higher torque than other alloys, or the same torque and power output can be achieved with a 30% reduced footprint. This is a significant advancement in electric aviation, promising more efficient, quieter, and sustainable air travel.

Watch Video: The Motor Putting the Electrification Revolution in Motion

Things to Consider for Future Impact

As we look toward the future of air travel, several factors must be considered.

Infrastructure and Charging Solutions

The scaling of electric aviation requires robust charging infrastructure, with current projections indicating a need for over 1,000 vertiports globally by 2028. Key challenges include developing standardized charging protocols capable of delivering megawatt-level power and ensuring sufficient grid capacity at vertiports.

This includes the development of infrastructure such as vertiports for vertical takeoffs and landings, as well as charging stations for electric aircraft. The transition to electric aviation will require a significant overhaul of existing airport infrastructure. Still, the benefits of reduced noise pollution, lower operating costs, and environmental sustainability make it a worthwhile investment. New vertiport facilities will open within cities, promising quick and convenient access to downtown locations. Existing airports will likely feature dedicated eVTOL landing pads and charging stations in the future, transforming the air travel landscape. Moreover, the development of fast-charging technologies will be crucial to ensure the efficient operation of these electric aircraft.

Public Perception

Public acceptance of eVTOLs will be crucial for their success. Recent market research indicates that many urban commuters would consider using air taxis if safety and reliability standards match traditional aviation. Current challenges include addressing range anxiety and establishing trust in autonomous flight systems. Companies also plan to keep prices low — around the cost of a premium Uber Black car ride. Major airlines like United, American Airlines, and Delta have already invested in eVTOL start-ups to develop this, indicating a growing acceptance of this technology. As more people become aware of the advantages of eVTOLs, public perception will likely continue to improve. Education and awareness campaigns will play a key role in shaping public opinion and fostering acceptance of this new form of air travel.

Environmental Impact

One of the most significant benefits of eVTOLs is their environmental sustainability. As they are electric, they do not produce carbon emissions during flight, making them more environmentally friendly than conventional aircraft that rely on fossil fuels. Current estimates suggest that the widespread adoption of electric aircraft could reduce aviation-related carbon emissions by up to 40% by 2035. The shift to electric and hybrid electric aviation, from either a battery or hydrogen energy source, is paramount given the 2% of total greenhouse gas emissions that air travel currently contributes yearly. However, challenges remain in battery production sustainability and end-of-life recycling, areas where advanced materials and manufacturing processes are driving improvements.

Government Laws and Regulations

Government regulations will play a crucial role in developing and deploying eVTOLs. Regulatory bodies must establish safety and operational guidelines for these new aircraft types. This will involve a careful balance between fostering innovation and ensuring passenger safety. As eVTOL technology continues to evolve, so will the laws and regulations governing its use. This will be critical to successfully integrating eVTOLs into mainstream air travel. Collaboration between industry stakeholders, regulatory bodies, and governments will be vital in creating a regulatory environment supporting electric aviation's growth and development.

What is the Future of Air Travel for eVTOL?

Looking to the future, electric aviation promises significant changes in air mobility. eVTOL urban air mobility will alter travel within cities, improving transit times and lowering congestion. Regional air mobility solutions will connect cities with 15-30 passenger aircraft covering distances up to 250 miles. Carpenter Electrification's high-induction Hiperco® and stator and rotor stacks improve electric propulsion unit (EPU) performance for eVTOL and electric and hybrid electric airplanes. Our materials directly address key power density and motor challenges through improved efficiency. Modeling of various eVTOL designs has shown that Hiperco®-powered motors can increase payload capacity by one passenger, a significant improvement in profitability for airline operators.

As we look even deeper into the future, we can expect to see a sky filled with quiet, efficient, and environmentally friendly electric aircraft — primarily due to the vast potential applications of eVTOLs. They could serve as air taxis in urban areas, providing a quick and convenient mode of transportation that bypasses ground traffic. Flights will be shorter, averaging around 28 minutes, with one to six passengers and the pilot. Vertiports — the landing pads for eVTOLs — are much smaller than airports and will be located in multiple spots within a city. The benefits of eVTOLS will be most significant in large metropolitan areas with high traffic and frequent gridlock. eVTOLs, due to their unique takeoff and ability to land in remote areas, could also play a significant role in emergency services, providing rapid response capabilities when time is of the essence.

The commercialization of electric aircraft will transform air travel, bringing people worldwide more flexible, convenient, and clean transportation. This includes eVTOL aircraft, hybrid and full-electric airplanes for regional air mobility, and e-copters. We might even see the advent of flying cars and hoverbikes in the not-so-distant future.

Electric aircraft will need high-output motors and generators with lightweight and compact form factors for large-scale electrification to become a reality. Carpenter Electrification's high-induction Hiperco® alloys give e-motor designers the materials they need to achieve high power density, high torque density, and reduced size and weight. Our advanced stator and rotor stack manufacturing capabilities enable thin Hiperco® laminations, which are ideal for high-speed motors and generators, ensuring low core loss, continuous power operation, and lower operating temperatures.

Reach Out to Discuss Electric Aircraft

Carpenter Electrification is at the forefront of this revolution, providing industry-leading soft magnetic alloys and stacks to optimize the performance of motors used in electric aircraft. To explore how our advanced materials can support your 2026 electrification needs or discuss partnership opportunities, connect with our team of experts today.

You can also visit our technical resource center for detailed insights into electric aircraft materials and sustainable air travel solutions. And if you're ready to revolutionize flight, our team is here to help address your motor design needs for current and future electric airplanes and eVTOLs.

The Science Behind Thin Laminations for High-Frequency Motor Applications

Carpenter Electrification — Tue, 09 Dec 2025 14:42:09 GMT

The push for higher power density and improved efficiency in electric motors spans virtually every industry. Engineers face mounting pressure to deliver motors that are smaller, lighter, and more efficient, enabled by advances in silicon carbide (SiC) and gallium nitride (GaN) power electronics that allow motor drives to operate at previously impractical frequencies.

However, these higher switching frequencies introduce new challenges.

Traditional lamination thicknesses become a significant limitation when operating above 800 Hz, as the relationship between operating frequency, lamination thickness, and core losses becomes increasingly critical. Let’s explore in more detail.

Why Traditional Designs Fall Short

As switching frequencies rise beyond traditional ranges, core loss mechanisms undergo a dramatic shift. What works efficiently at 400 Hz can become a significant source of losses at 1500 Hz or higher, primarily due to increased eddy current losses when using traditional lamination thicknesses.

This challenge is particularly acute across today's electrification landscape. Electric vehicles must match the high switching frequencies of their SiC inverters. Hybrid and electric aircraft demand the extreme power density that only high-frequency operations can deliver. Defense systems, drones, and precision medical equipment all push beyond what's possible with traditional motor designs.

Understanding Frequency-Induced Losses in Motor Cores

Motor core losses consist of two primary components that behave very differently as frequency increases. Understanding these loss mechanisms is essential for selecting the appropriate lamination thickness.

Eddy Current Physics at High Frequencies

Eddy current losses in laminations increase proportionally to the square of both the operating frequency and the lamination thickness. This quadratic relationship indicates that as frequencies increase, the impact of lamination thickness on overall losses becomes increasingly pronounced.

At standard operating frequencies below 400 Hz, eddy current losses may represent a manageable portion of total core losses. However, as frequencies climb into the kilohertz range, these losses can quickly dominate.

The physics relates to induced currents that circulate within the conductive lamination material when exposed to alternating magnetic fields. Thinner laminations restrict the paths available for these currents, effectively reducing their magnitude and the associated losses.

The Crossover Point

A critical concept in high-frequency motor design is the crossover point—the frequency at which eddy current losses begin to exceed hysteresis losses. Operating above this crossover frequency without adjusting lamination thickness results in rapidly escalating losses that can compromise motor performance.

Our analysis of Hiperco® 50 demonstrates this principle. The crossover point shifts to higher frequencies as lamination thickness decreases, providing a wider operational range before eddy currents dominate. This relationship underscores why traditional lamination thicknesses become inadequate for high-frequency applications.

Modern Applications Driving Ultra-Thin Lamination Demand

The push toward higher operating frequencies stems from specific advantages that directly address modern engineering challenges.

SiC/GaN Inverter Requirements

Silicon carbide and gallium nitride power electronics have revolutionized motor drive capabilities, enabling switching frequencies from 20 kHz to over 100 kHz. These advanced semiconductors offer significant advantages:

Lower switching losses that maintain efficiency at high frequencies
Higher temperature operation capability, reducing cooling requirements
Faster switching transitions that enable more precise motor control
Smaller passive components due to higher switching frequencies

However, realizing their full potential requires motor designs that can handle elevated frequencies without excessive core losses. Standard lamination thicknesses become significant bottlenecks when paired with SiC or GaN devices.

Additional High-Frequency Applications Across Industries

Modern applications across industries are pushing frequency boundaries based on unique performance requirements, including:

Electric aircraft propulsion - Distributed propulsion systems operate at 2000-4000 Hz to achieve critical power density for flight, where every gram of weight reduction matters.
High-speed industrial machinery - Compressors and turbo equipment run at 1500-3000 Hz to minimize footprint while maintaining efficiency in challenging environments.
Medical and surgical devices - Precision tools and imaging equipment push into ultrasonic frequencies, demanding compact size with absolute reliability.
Defense systems - Military applications require operation at extreme frequencies while maintaining performance in harsh conditions.

These diverse applications share a common need: achieving maximum performance from minimal size and weight, making optimized thin laminations essential for meeting their demanding specifications.

Calculating Optimal Thickness

Selecting the appropriate lamination thickness requires balancing multiple factors, with operating frequency being the primary driver.

Frequency Bands and Recommendations

Based on extensive analysis of hysteresis and eddy current loss contributions in our Hiperco® alloys, we've established optimal thickness ranges:

For 300-800 Hz applications, 0.15 mm Hiperco® laminations deliver an optimal balance of performance and manufacturability. As frequencies increase to 800-1800 Hz, transitioning to 0.10 mm laminations becomes necessary. The reduction in thickness results in a significant decrease in eddy current losses, which more than compensates for any increase in processing complexity.
For applications exceeding 1800 Hz, even thinner laminations are recommended. Some extreme applications may benefit from laminations as thin as 0.05 mm, though these require specialized handling and processing techniques.

Using Loss Data for Selection

The core loss data table provides quantitative guidance for material selection. At 0.10 mm thickness, Hiperco® 50 shows core losses of 19 W/kg at 400 Hz, increasing to 52 W/kg at 1000 Hz. Comparing this to 0.25 mm thickness at the same frequencies (24 W/kg and 102 W/kg, respectively) demonstrates the substantial benefit of thickness reduction at higher frequencies.

Material Processing Advances for High-Frequency Performance

Achieving optimal performance from thin laminations requires more than just reducing thickness. The magnetic and mechanical properties of our alloys can be fine-tuned through processing techniques that directly impact high-frequency performance.

Our controlled processing approach optimizes materials for specific frequency ranges:

Thermal treatment optimization - Precise heat treatment modifies grain structure, allowing us to shift the optimal frequency range for a given thickness.
Stress relief protocols - Controlled stress relief improves permeability and can reduce core losses by up to 20% in high-frequency applications.
Surface finish refinement - Specialized finishing processes minimize losses while maintaining proper insulation integrity.
Advanced coating systems - Our coatings achieve a consistent thickness of 1-2 microns while maintaining breakdown voltages for high-frequency operation.

This processing flexibility proves valuable when balancing performance against cost. Through optimization, we can extend the frequency range of standard thickness laminations, avoiding the premium of ultra-thin materials when peak performance isn't essential.

Manufacturing Challenges: Producing Ultra-Thin Laminations at Scale

The production of ultra-thin laminations presents unique manufacturing challenges. Stamping tolerances become critical as thickness decreases, and the inherent growth of iron-cobalt alloys like our Hiperco® materials must be carefully predicted and compensated for in die design.

Edge quality control is paramount in high-frequency applications — burrs or deformation can create shorting paths that dramatically increase losses. Advanced cutting techniques must be optimized for each thickness range to maintain quality while achieving production efficiency.

Stack assembly complexity increases with thinner laminations as more layers require precise handling and alignment. Automated stacking systems become essential for maintaining quality at production volumes while minimizing the risk of damage during assembly.

Cost vs. Performance: When Thinner Isn't Always Better

While thinner laminations generally provide better high-frequency performance, the relationship between thickness reduction and system-level benefits isn't always linear. The cost implications extend beyond raw material expenses to include increased processing complexity, reduced manufacturing yields, and longer assembly times.

A motor operating at 600 Hz, for example, may show only marginal loss improvement when moving from 0.15 mm to 0.10 mm laminations, but the thinner material could increase stack costs by 30-40%. Understanding these trade-offs enables designers to optimize for total system value rather than pursuing maximum technical performance at any cost.

Partnering for High-Frequency Motor Excellence

The transition to high-frequency motor operation represents both a challenge and an opportunity. Success requires a deep understanding of the relationships between operating frequency, lamination thickness, and core losses, combined with expertise in material processing and manufacturing techniques.

We combine materials expertise, processing knowledge, and manufacturing capabilities to support the development of high-frequency motors. Our Hiperco® alloys, developed and refined over decades, provide the foundation for superior high-frequency performance. Our application engineers understand the complex trade-offs involved in lamination selection and can help identify the optimal combination of alloy grade, thickness, and processing approach for your specific application.

Ready to optimize your high-frequency motor design? Contact our team today.

Past to Future: The Electric Powertrain Revolution Reshaping Performance Cars

Carpenter Electrification — Sun, 12 Oct 2025 12:12:39 GMT

The electric vehicle landscape has undergone a dramatic transformation since 2017, when high-performance electric vehicles (EVs) first surpassed the 700-horsepower threshold. What seemed revolutionary then — Tesla producing 40,000 cars with 700+ hp — now represents the baseline for premium electric performance. Today's EVs can routinely exceed 1,000 horsepower, with manufacturers pushing boundaries that would have seemed impossible just a few years ago.

This evolution reflects more than incremental improvements. The convergence of 800V architectures, silicon carbide inverters, and advanced motor designs has fundamentally redefined what's possible in electric powertrains. But at the heart of this transformation lies a crucial component: the soft magnetic materials in the motor — the core of the EV powertrain — that enable unprecedented power density and efficiency.

The Evolution of Electric Vehicle Performance

The journey from niche environmental statement (with over one million EVs sold globally in 2017, most under 500 hp) to performance benchmark (with over 17 million globally, ranging from 200 to 1000+ hp) occurred faster than most industry observers predicted.

In 2020, vehicles with more than 500 hp accounted for just 4.1% of total EV sales. Current data indicate that this segment has experienced significant expansion with absolute volumes increasing even more dramatically as overall EV adoption accelerates.

The high-performance EV market, comprising EVs with 500 hp or more, is projected to reach approximately 25 million units by 2030. The global luxury electric vehicle market, including those with powerful drivetrains, was estimated to be worth $223.05 billion as of the end of 2024.

From Pioneers to Today's 1000+ HP Capabilities

The performance (and luxury) ceiling has risen consistently. Lucid's Air Sapphire delivers 1,234 hp, while Rimac's Nevera delivers with 1,888 hp, and Porsche's Taycan Turbo GT achieves 1,019 hp using advanced motor design materials.

But reaching these power levels creates competing demands. Engineers need motors that are simultaneously more powerful, more efficient, and smaller—all while managing extreme thermal loads. This is where material science becomes critical.

The Advanced Magnetic Materials Advantage

Three critical factors determine electric motor performance: power density, torque, and efficiency. Traditional electrical steel reaches its practical limits below 2.0 Tesla saturation, constraining what is achievable.

Advanced soft magnetic alloys, such as Carpenter Electrification's Hiperco® 50, achieve saturation levels of up to 2.4 Tesla, providing the high induction, fast response, and low core losses necessary for superior stator and rotor stacks (what’s used to power the electric motor) performance in these EV powertrains.

This delivers measurable improvements across all three critical factors:

Power Density and Motor Size

The higher magnetic saturation of advanced alloys enables engineers to achieve more power from less material. This fundamental advantage transforms motor design possibilities:

Up to 20-30% higher power density
Up to 20-30% reduction in motor size
Enables lighter, more compact powertrain designs

Torque and Acceleration

Advanced magnetic materials allow motors to generate stronger magnetic fields without proportionally increasing current draw. This translates directly to improved vehicle performance:

Up to 15-25% torque increase
Faster acceleration response, sometimes up to 20% faster (most mainstream EVs have 0-60 mph times in the 4-7 second range)
Maintained performance at high switching frequencies (20+ kHz with SiC inverters)

Efficiency and Range

Lower core losses and improved magnetic response reduce energy waste throughout the motor's operating range. These efficiency gains compound to deliver real-world benefits:

Up to 3% efficiency increase
Significant reduction in energy consumption during city driving
Industry-leading efficiency for extended range

System-Level Benefits

These motor improvements cascade throughout the entire powertrain:

Battery size reduction while maintaining range
Lower thermal stress with operating temperatures reduced by up to 60°C
Increased powertrain reliability through reduced heat generation
Significant cost savings from downsized components
Weight reduction from smaller motors and batteries

The Road Ahead: 2025 and Beyond

Higher performance targets from manufacturers mean intensifying demands on motor technology. Electric aviation represents another frontier, with eVTOL aircraft targeting 20 kW/kg at the motor level. Commercial vehicle electrification presents different challenges, requiring sustained high torque while managing thermal constraints.

The sustainability narrative increasingly influences purchase decisions in premium segments. Improved motor efficiency reduces lifetime energy consumption, while smaller motors require less raw material. Advanced magnetic materials enable the more efficient use of critical materials, such as rare earth magnets and copper, demonstrating superior lifecycle performance through improved efficiency, reduced size, and extended operating life.

As 2025 progresses, the convergence of performance demands, efficiency requirements, and environmental considerations will continue driving innovation in motor materials. The manufacturers who leverage these advanced material capabilities will define the next generation of electric vehicle performance .

Ready to Push the Boundaries of Electric Motor Performance?

The industry's push toward more ambitious targets makes advanced soft magnetic alloys increasingly critical. Our team can help you leverage advanced soft magnetic alloys to create motors that deliver exceptional power density, torque, and efficiency. Contact our experts today to discuss how Hiperco® 50 and our complete portfolio of soft magnetic materials can transform the motor at the heart of your next EV powertrain.

Choosing the Right Alloy: Comparing Magnetic Materials for Electric Motors

Carpenter Electrification — Wed, 06 Aug 2025 15:00:00 GMT

The selection of magnetic materials for electric motors has become increasingly critical as industries demand higher efficiency, greater power density, and enhanced performance in compact packages.

With options ranging from traditional electrical steel to advanced alloys like Hiperco® and Hypocore®, understanding how material properties impact motor performance is essential for next-generation electric motors. Let's dive in.

Understanding Magnetic Material Requirements

In electric motors, soft magnetic alloys provide the medium for electromagnetic energy conversion, converting electrical input into mechanical output. Their selection is one of the most fundamental decisions in motor design.

These materials directly influence critical parameters through their inherent properties, including:

Maximum torque and power output within size constraints
Motor dimensions and weight for system integration
Operational efficiency and heat generation
Performance stability across varying conditions
Manufacturing complexity and production costs
Long-term reliability over the product lifecycle

Comparing Material Options

Let's examine how today's material options stack up, from conventional silicon steel to cutting-edge alloys that are reshaping motor design possibilities.

Silicon Steel (electrical steel)

Silicon steel, the most widely used magnetic material in conventional electric motors, offers an economical balance between cost and performance. Adding silicon to iron significantly increases electrical resistivity and reduces eddy current losses while maintaining reasonable saturation properties at a competitive price point.

Silicon steel typically comes in two primary varieties with distinct processing and performance characteristics:

Non-oriented electrical steel: 2-3.5% silicon with uniform magnetic properties in all directions
Grain-oriented electrical steel: 3-4.5% silicon with enhanced properties in one direction

While silicon steel offers good magnetic properties at a reasonable cost, it encounters significant limitations in demanding applications:

Magnetic saturation limited to ~20 kilogauss
Higher core losses compared to premium alternatives
Diminishing performance at high frequencies
Lower permeability characteristics

Hiperco® Alloys

Our Hiperco® family of iron-cobalt soft magnetic alloys represents the premium tier, offering exceptional magnetic performance for the most demanding applications. These specialized alloys combine carefully balanced compositions with sophisticated processing to achieve unmatched properties.

Hiperco® alloys provide several distinctive performance advantages that directly translate to enhanced motor capabilities:

Highest magnetic saturation (up to 24 kilogauss) commercially available
Superior permeability for maximum electromagnetic efficiency
25% higher magnetic induction than electrical steel
30% lower core losses
Available in 0.1-0.5mm thicknesses

These enhanced material properties translate to substantial real-world performance benefits:

25% greater torque density
30% improvement in power density
Up to 30% size reduction potential
Enhanced thermal characteristics
Extended motor lifespan

Hypocore® Alloys

Hypocore® represents a strategically positioned intermediate option between premium Hiperco® and conventional silicon steel. This low-cobalt alternative offers superior magnetic characteristics compared to standard electrical steel while maintaining a favorable cost structure for high-volume applications.

Key performance characteristics of Hypocore® include:

Low coercivity, high permeability, increased electrical resistivity
3-4% higher magnetic induction than electrical steel
15-20% lower core losses
Magnetic saturation of 21 kilogauss
Optimized composition for electrical resistivity

Material Selection Framework

Selecting the optimal magnetic core material requires a systematic evaluation of application requirements against material properties, manufacturing considerations, and economic factors. The following framework offers a structured approach to material selection.

1. Performance Requirements Assessment

Begin the selection process by clearly defining what your motor needs to achieve. Account for these critical performance parameters:

Required torque and power density within dimensional constraints
Operating frequency range
Efficiency targets and acceptable losses
Size and weight limitations
Thermal management capabilities
Environmental conditions and service life

2. Frequency Considerations

The frequency at which your motor operates determines which materials will maintain efficiency and minimize losses. Here's how different frequency ranges align with material choices:

Low-Frequency (50-60 Hz): Silicon steel may suffice for cost-sensitive applications
Medium Frequency (400 – 800 Hz): Hiperco® offers substantial advantages and Hypocore® is an economical alternative with lower losses than silicon steel
High-Frequency (>1kHz): Hiperco® with thin laminations delivers exceptional performance

3. Size and Weight Constraints

When every gram and millimeter counts, material selection becomes critical. Different industries and applications face varying levels of constraint, as shown below:

Aerospace/eVTOL: Hiperco® enables critical size/weight reductions
Automotive: Hypocore® balances performance and economics
Industrial: Silicon steel is adequate where constraints are less restrictive

4. Thermal Management Considerations

The ability of a material to manage heat effectively directly affects motor reliability and performance. High-performance alloys (like Hiperco®) offer several thermal advantages, including the following:

High-performance magnetic alloys generate substantially less heat through reduced core losses
Advanced materials enable higher continuous power operation without excessive temperature rise
Reduced thermal stress extends component life by minimizing thermal cycling

5. Economic Considerations

True material value extends beyond the initial purchase price to encompass the total cost of ownership, including all associated expenses. Consider these economic factors:

Material acquisition costs, including raw materials and processing
Manufacturing complexity and associated production costs
Performance advantages that translate to operational benefits
Lifetime operational savings through reduced energy consumption
Warranty and maintenance implications affecting total cost of ownership

Application-Specific Material Selection

Different industries prioritize different performance characteristics based on their unique constraints and requirements. For example:

Aerospace & eVTOL: Weight and size constraints make Hiperco® stand out, delivering 12-20% increased flight range, 20% higher payload capacity, and enhanced reliability for safety-critical systems.
Electric Vehicles: Premium EVs use Hiperco® for maximum torque density, mid-range EVs benefit from Hypocore®'s balanced performance and cost, while commercial EVs may leverage enhanced materials for improved range.
Industrial Applications: Where reliability matters most, advanced iron-cobalt materials like Hiperco® and Hypocore® reduce energy consumption, extend motor life, and enable smaller footprints, delivering substantial lifetime savings that justify higher initial costs.

Manufacturing Considerations

Material selection decisions cannot be separated from manufacturing capabilities, as advanced magnetic materials require specialized processing expertise to realize their performance potential.

Traditional manufacturing methods encounter the following limitations when working with high-performance alloys:

Dimensional changes during heat treatment
Achieving tight tolerances requires expensive post-processing
Conventional stacking methods compromise copper fill factors
EDM cutting limits production volume and increases costs

Our integrated manufacturing approach overcomes these limitations through the following process optimizations:

Precision strip hot rolling with dimensional stability controls
Engineered heat treating and bonding processes
Advanced lamination techniques ensuring consistent performance
Automated stacking methods in controlled environments
Comprehensive testing protocols at every production stage

Quality Assurance Framework

Maintaining consistent material performance requires comprehensive quality control throughout the production process. Our framework includes the following critical measures:

Advanced material property verification throughout production
Real-time dimensional monitoring systems
Statistical process control for early deviation detection
Complete production traceability
Automated inspection systems
Controlled environmental conditions during critical stages

Additionally, our AS9100 certification meets aerospace industry standards, ensuring consistent performance in applications where reliability is paramount.

The Path to Superior Performance

Selecting the right magnetic material directly impacts your electric motor's power density, efficiency, and overall performance. As applications become increasingly demanding, advanced materials like Hiperco® and Hypocore® alloys deliver the exceptional magnetic properties needed to meet these challenges while enabling smaller, lighter, and more efficient motor designs.

Want to learn more? Access our datasheets to learn how Hiperco® can optimize your electric motor performance. Contact Carpenter Electrification to discuss your specific application needs.

Transforming Electric Motors Through Advanced Materials

Carpenter Electrification — Tue, 29 Jul 2025 12:57:10 GMT

Motion is the key to the electrification revolution. As electric motors power everything from electric vehicles and aircraft to industrial equipment and consumer electronics at an accelerating rate, material selection has emerged as the critical differentiator in achieving breakthrough performance.

High-performance soft magnetic alloys, particularly Carpenter Electrification's Hiperco® iron cobalt family, are transforming motor capabilities by enabling unprecedented improvements in power density, torque, and efficiency, creating new possibilities for motor designers across industries.

Understanding the Motor Optimization Tradeoff

For decades, engineers designing electric motors have navigated an inherent challenge: optimizing for one performance factor typically meant compromising on others. The three fundamental factors are inextricably linked:

Power Density: The amount of power a motor can deliver relative to its size and weight
Torque: The rotational force generated by the motor
Efficiency: How effectively the motor converts electrical energy to mechanical energy

Conventional electrical steels imposed strict limitations on this balancing act — increasing power density often required sacrificing efficiency, while maximizing torque might mean accepting a larger motor. These trade-offs have traditionally defined the boundaries of what is possible in motor design.

How Material Selection Shifts the Balance

The soft magnetic materials used in a motor's stator and rotor fundamentally determine its magnetic properties and performance envelope. By offering superior magnetic induction, permeability, and reduced core losses, advanced alloys like Hiperco® are expanding what's possible in motor design.

These materials don't just incrementally improve performance; they significantly enhance it. They fundamentally alter the optimization equation, enabling designers to achieve previously unattainable combinations of power density, torque, and efficiency. The performance improvements are substantial and measurable:

Up to 30% higher power density
Up to 25% increased torque as a drop-in solution
Up to 3% improvement in motor efficiency

These gains create new possibilities across industries — from extended electric vehicle range to enhanced electric aircraft payload capacity.

The Material Science Behind High-Performance Motors

Today's dramatic motor performance improvements stem from advances in soft magnetic alloys that surpass the conventional electrical steels used for decades. While these traditional materials have been adequate for many applications, they impose inherent limitations on magnetic saturation, core losses, and permeability.

Hiperco®, a family of iron-cobalt soft magnetic alloys, breaks through these barriers with:

Nearly 25% higher magnetic induction (saturation)
Superior permeability for better magnetic flux
Up to 30% lower core losses, especially at higher frequencies
Better thermal conductivity for heat dissipation

These properties enable smaller, more powerful, and more efficient motors than ever before. The Hiperco® family includes several variations optimized for different applications — from aerospace motors to high-torque electric vehicle drives — revealing how specialized material science and manufacturing processes create today's breakthrough performance.

The Manufacturing Process: From Alloy to Motor Stack

Converting these advanced alloys into high-performance motor components requires specialized expertise. The journey from raw alloy to finished motor stack involves several critical steps:

Precision Melt Processing: Controlled vacuum induction melting to ensure exact alloy composition
Specialized Rolling: Advanced hot and cold rolling techniques to achieve desired thickness and grain structure
Custom Heat Treatment: Precise thermal processing to optimize magnetic properties
Laminations: Cutting thin strips, as thin as 0.004", into stator and rotor shapes at high tolerance, high volume, and with high yield
Lamination Stacking: Assembly with tight tolerances to enable reduced motor component air gaps and proper insulation to minimize stack core loss
Final Processing: Quality control and testing to ensure performance specifications of fully assembled stator and rotor stacks

Inadequate processing can significantly diminish Hiperco®'s performance benefits, making stack manufacturing expertise as crucial as the alloys themselves.

Optimizing for Power Density

In today's high-performance applications, from defense vehicles to eVTOLs and electric aircraft, generating more power from smaller, lighter motors is a game-changing advantage. Power density optimization enables designers to reduce weight, conserve space, and enhance system-level performance; however, it necessitates the use of specialized materials and design approaches to overcome the thermal and magnetic challenges associated with compact, high-output motors.

Material Solutions for Compact Motor Design

Power density, the ratio of power output to motor size and weight, is particularly critical in applications where space and weight are at a premium. Hiperco® alloys enable substantial improvements through:

Higher magnetic saturation, allowing more magnetic flux in a given volume
Reduced core losses, minimizing wasted energy
Better thermal properties, enabling more compact designs with simplified cooling

These properties allow designers to increase power output within the same motor envelope or reduce motor size while maintaining performance, providing valuable flexibility in system design.

Thermal Management Considerations

As power density increases, thermal management becomes increasingly critical. The superior thermal properties of advanced soft magnetic alloys help address this challenge by:

Generating less heat through reduced core losses
Providing better thermal conductivity for heat dissipation
Maintaining consistent magnetic properties across a broader temperature range

Motors using Hiperco® alloys typically run 10-20°C cooler than conventional materials, allowing for more compact designs with simplified thermal management systems.

Maximizing Torque Output

Torque, the rotational force that enables a motor to perform work, is a critical performance metric that directly impacts acceleration, load-carrying capacity, and overall system capability. Enhanced torque can transform performance in applications ranging from electric vehicles to industrial machinery.

Material Properties That Enhance Torque Generation

Torque is directly related to the magnetic field strength within the motor. The superior magnetic properties of Hiperco® alloys enhance torque generation through higher magnetic saturation that produces stronger magnetic fields, improved permeability allowing more complete magnetization, and lower losses that convert more energy into useful torque rather than waste heat.

Performance Data: Torque Improvements with Hiperco®

Real-world testing demonstrates substantial torque advantages:

Up to 25% higher torque as a direct drop-in replacement in existing motor designs
Improved torque density (torque per unit volume) by up to 30%
Enhanced continuous torque capabilities due to better thermal performance
More consistent torque delivery across operating conditions

These improvements directly translate into enhanced acceleration, climbing ability, and load-carrying capacity in electric vehicles, as well as increased thrust capabilities in electric aircraft. Applications particularly benefiting from enhanced torque include electric supercars for instant acceleration, heavy-duty vehicles requiring high starting torque, eVTOL aircraft during critical flight phases, and industrial machinery for efficient material handling.

Enhancing Motor Efficiency

As energy costs rise and battery capacity remains a limiting factor in mobile applications, motor efficiency has become increasingly critical. Even minor efficiency improvements can yield significant benefits — extending range, reducing operating costs, and enabling longer run times.

How Material Selection Affects Energy Conversion

Efficiency in electric motors refers to how effectively they convert electrical energy into mechanical output. Losses occur primarily through:

Core losses (eddy currents and hysteresis)
Copper losses in the windings
Mechanical losses (friction and windage)

Advanced soft magnetic alloys like Hiperco® primarily address core losses, which can account for a significant portion of total motor losses, especially at higher frequencies.

Reducing Core Losses Through Advanced Alloys

Core losses in motor laminations occur through hysteresis losses during magnetic field reversal and eddy current losses from induced circulating currents. Hiperco® alloys reduce these losses through optimized metallurgical structure, higher resistivity, and precise control of impurities, resulting in up to 30% lower core losses compared to conventional electrical steels.

Making the Right Material Choice for Your Application

Selecting soft magnetic materials for electric motors is no longer a one-size-fits-all decision. Today's advanced alloys enable designers to precisely target the performance attributes most critical for their specific application.

For aerospace applications where weight is critical, the higher power density of Hiperco® alloys can enable significant system-level weight savings. For electric vehicles seeking to maximize range and performance, combining higher torque and improved efficiency offers compelling advantages. For industrial applications with continuous duty cycles, the reduced heat generation and extended service life can justify the investment in premium materials.

As electrification continues to transform industries worldwide, advanced soft magnetic alloys will play an increasingly vital role in enabling the next generation of high-performance electric motors, pushing the boundaries of what's possible in power density, torque, and efficiency.

Advanced Techniques for Enhancing Electric Motor Performance and Efficiency

Carpenter Electrification — Thu, 01 May 2025 14:00:00 GMT

The electric revolution demands motors that deliver maximum performance within increasingly challenging constraints. Whether you're designing for aerospace, automotive, or industrial applications, the fundamental question remains: How do you optimize your motor for the specific demands of your application?

Do you need increased torque within a restricted volume? Are you looking to extend vehicle range through improved efficiency? Or perhaps you need to reduce motor size while maintaining performance? The answers lie in material selection and implementation expertise.

Key Performance Parameters in Electric Motors

Successful electric motor design requires balancing three critical parameters that define performance in electrified applications.

Power Density Requirements

Power density — the ratio of power output to motor volume — has become the north-star metric for next-generation motor designs. Higher power density translates directly to system-level benefits such as faster acceleration, reduced weight, extended range, increased payload capacity, and improved economics in weight-sensitive applications like aerospace.

Carpenter Electrification's Hiperco® soft magnetic alloys deliver up to 30% more power density than conventional electrical steels. This improvement creates a cascade of benefits throughout the system design, from battery sizing to thermal management.

Torque Specifications

Torque delivery determines how your motor performs under load —affecting everything from acceleration in EVs to precision in robotics. Traditional motor designs often struggle with torque-to-weight ratios, especially in space-constrained applications.

Our soft magnetic alloys offer up to 25% higher torque as a drop-in solution in current motor designs. This performance advantage doesn't require complete redesign—simply upgrading to Hiperco® alloys can transform existing architectures with minimal changes to manufacturing processes.

Motor Efficiency

Every percentage point of efficiency improvement in an electric motor translates to extended range, reduced battery requirements, and lower operating costs over the product lifecycle. In commercial applications, these efficiency gains are compounded into significant operational advantages.

With lower core losses, our soft magnetic alloys can increase motor efficiency by up to 3% — a substantial improvement in a field where engineers typically fight for fractions of a percent. These efficiency improvements directly impact system-level performance.

Material Innovations Driving Motor Performance

The foundation of electric motor performance lies in material selection, particularly the soft magnetic materials used in stator and rotor constructions.

Soft Magnetic Alloys and Power Density Gains

Hiperco® alloys provide 25% higher induction, better permeability, and 30% lower losses than conventional electrical steel. These properties create options for designers to optimize their approach based on application priorities:

Increase torque without altering your current motor design
Increase power without re-sizing your motor
Decrease your motor size without sacrificing torque

This flexibility allows engineers to focus on their specific design constraints rather than forcing compromises that undermine overall system performance.

How Material Selection Influences Torque

Torque production in electric motors is directly influenced by magnetic flux density. Hiperco® alloys achieve higher saturation induction (up to 2.4T), allowing motors to generate more torque from the same volume.

For design engineers, this creates opportunities to either boost performance within existing envelope constraints or maintain performance while reducing motor dimensions up to 30% — a critical advantage in space-constrained applications.

Core Loss Reduction

Energy wasted as heat in the magnetic core represents one of the primary efficiency limitations in electric motors. Our engineered soft magnetic materials minimize these losses through an optimized microstructure and precise processing.

The result is motors that run 10-20°C coolers during operation, offering better thermal management options and improved motor life. This temperature reduction compounds the efficiency advantages while simultaneously extending the components' lifespan.

Thermal Management: The Critical Fourth Parameter

While power density, torque, and efficiency receive the most attention, thermal management has emerged as an equally critical parameter in motor design. Heat generation limits peak performance and accelerates component degradation.

Our soft magnetic alloys address this challenge directly. Motors utilizing our materials run coolers at 10-20°C during operation, which is more than conventional designs. This temperature reduction provides several cascading benefits:

Extended component lifespan
Higher sustained power output
Reduced cooling system requirements
Improved reliability in high-temperature environments

This thermal advantage is helpful in weight-sensitive vehicles where the weight of the thermal management system must be minimized or those requiring sustained high-power operation.

Measuring and Quantifying Performance Improvements

The advantages of advanced soft magnetic materials translate into measurable performance gains that impact both technical specifications and business outcomes.

Technical Specs and Business Impact

Our engineering partnerships deliver quantifiable improvements across key performance metrics:

Power Density: Up to 30% improvement
Torque: Up to 25% increase as a drop-in solution
Efficiency: Up to 3% improvement
Thermal Performance: 10-20°C cooler operation
Size Reduction: Up to 30% smaller footprint possible without performance loss

These technical advantages translate to business benefits, including extended range, reduced battery requirements, lower warranty costs, and improved product differentiation.

Implementing Advanced Motor Optimization

Maximizing the benefits of high-performance soft magnetic alloys requires expertise beyond material selection. Processing techniques must be optimized for magnetic performance, dimensional tolerance, quality, yield, and production scalability.

Custom Solutions

Carpenter Electrification is a one-stop shop for laminations and stacks, with advanced, automated equipment and integrated processing from melt to strip and through stack assembly and test. Our team focuses on helping you realize your stator and rotor stack needs from prototype to serial production. We implement the best production method for your product based on the following:

Unique performance requirements
Design maturity
Volume demands
Process optimization for scale-up

Our decades-long expertise in specialized materials and stack processing offers unique high-performance stack solutions. Without expert knowledge of iron-cobalt stack processing, rotors and stators perform only marginally better than standard electrical steel.

Future-Proofing

The electrification revolution continues to accelerate, with performance demands increasing with each product generation. Partnering with Carpenter Electrification provides access to ongoing material innovations and processing improvements that keep your designs at the cutting edge of performance.

Our engineering team works alongside your designers to ensure the maximum benefits of high-performance soft magnetic alloys are realized for current products and your future roadmap.

Elevate Your Motor Performance

The path to optimized electric motor performance begins with material selection and extends through expert processing and implementation. Carpenter Electrification provides the advanced soft magnetic alloys and the engineering expertise required to transform these materials into high-performance motor components.

Whether you're looking to increase torque, extend range, increase payload capacity, reduce motor size, or improve thermal management, our tailored Hiperco® solutions create options for designers to optimize for their specific application needs.

Contact our team today to discuss your motor design challenges and discover how our soft magnetic materials can elevate your performance to new levels.

Maximizing Electric Aircraft ROI Through Advanced Materials Innovation

Carpenter Electrification — Wed, 23 Apr 2025 14:00:00 GMT

The economics of electric aircraft are fundamentally tied to their design and material choices. As the industry accelerates toward electrification, manufacturers and operators discover that advanced materials — particularly in motor components — aren't just a technical consideration but a critical driver of business performance and profitability. The selection of optimal materials early in the design process can create competitive advantages that compound throughout an aircraft's operational life.

The Business Case for Electric Aircraft

Electric aircraft represent more than just a sustainable alternative to conventional aviation. Their success hinges on delivering compelling economics across urban air mobility, regional transport, and commercial applications. While battery technology often dominates the conversation, the other major subsystems of the powertrain are equally important. The battery, the inverter, and the electric motor each incorporate advanced materials for optimal performance. The market opportunity is substantial - by 2030, demand for electric aircraft is projected to reach $37 billion annually, with over 5,000 units forecasted for urban air mobility alone.

Watch Video: The Motor Putting the Electrification Revolution in Motion

Advanced Materials Increase Power Density and Improve Performance Metrics

In the drive to higher performance systems, designers focus on improving the power density of motors. Material selection plays a critical role in achieving high power density. Advanced magnetic materials, like Carpenter Electrification's Hiperco®iron-cobalt alloys, particularly in electric motor components like stator and rotor stacks, create a cascade of performance benefits that directly impact the bottom line. These improvements compound across entire fleets, creating significant competitive advantages for operators who optimize their material choices.

A Closer Look at Power Density Advantages

Advanced materials like Hiperco® alloys enable higher power density motors that deliver up to 30% more power in the same footprint. These advanced soft magnetic materials also improve motor efficiency by up to 3%, reducing heat generation and cooling system requirements. These improvements allow aircraft designers to reduce motor size while maintaining performance or increase available power without weight penalties. These improved propulsion systems increase the aircraft's payload capacity and range.

Payload Capacity Benefits

The aircraft design process presents many trade-off decisions, and motor designers typically target a fixed budget for weight and volume. The high magnetic saturation and permeability of Hiperco® increase the propulsion units' power density and torque density by 20 - 30%. This generates more lift and thrust with the same motor weight and volume profiles. This translates to increased payload capacity — in many electric vertical takeoff and landing aircraft (eVTOL) designs, the maximum take-off weight (MTOW) increases to an additional passenger seat. Whether in urban air mobility or cargo applications, this extra capacity directly increases revenue potential per flight.

Read Blog: Maximizing eVTOL Motor Performance - From Materials to Manufacturing

Range Extensions

Performance data across multiple eVTOL configurations demonstrates range improvements of 12-30% (depending on the eVTOL model) through Hiperco®-based electric motor integration. For regional mobility applications, these extensions enable new route possibilities and improved operational flexibility. The enhanced range also provides crucial safety margins and reduces the need for energy-intensive reserve capacity, further improving efficiency.

Transforming Performance into Profit

The financial impact of these performance improvements is compelling. Analysis of typical eVTOL operations reveals how material-driven enhancements translate into revenue across various operational scenarios:

Additional Passenger Revenue

With average flight lengths of 25 miles and 25-40 daily flights at 90% utilization, a single additional passenger seat can generate up to $1.1 million in annual revenue, assuming only 50% occupancy of that extra seat. Over a 10-year service life, this represents over $10 million in incremental revenue per aircraft. For fleet operators, this revenue multiplies across each vehicle in service.

Operational Cost Savings

Beyond direct revenue, improved power density and efficiency reduce energy consumption and cooling requirements. Electric motors using Hiperco® stator and rotor stacks can operate at lower temperatures, reducing cooling system complexity and weight. These improvements compound across large fleets, creating meaningful operational cost advantages through reduced energy consumption and simplified thermal management.

Private Access: Hiperco® 50 Datasheet Interactive Dashboard

Maintenance Considerations

Higher-performance materials often demonstrate superior durability and thermal management, potentially extending service intervals and reducing maintenance costs. Lower operating temperatures reduce component stress and degradation rates. This impact grows significantly as fleet sizes increase, reducing maintenance requirements and creating substantial cost savings over the aircraft's operational life.

Real-World Performance Data

The benefits aren't theoretical. Modeling across multiple eVTOL configurations shows consistent improvements, including the following:

Multi-copter designs: Up to 18% payload increase or 19% range extension
Tilt-rotor configurations: 24-26% greater payload capacity or 17-30% longer range
Lift-plus-cruise aircraft: 21% payload improvement or 12% range increase

These gains allow operators to optimize their aircraft for specific mission profiles, whether prioritizing payload, range, or a balance of both.

Download Resource: Advanced Materials for Electrification Guide

Future Economic Implications

As the electric aircraft market matures, the economic advantages of advanced materials such as Hiperco® stators and rotor stacks will become increasingly critical. With annual eVTOL demand projected to reach 5,000+ units by 2030, manufacturers who optimize their designs for performance and profitability through materials innovation will capture dominant market positions. Early adopters of advanced materials technology will benefit from significant competitive performance and advantages in operating economics.

Accelerating Your Electric Aircraft Innovation

Advanced materials innovation is the path to profitable electric aircraft operations. With over 134 years of specialty alloy expertise and a deep understanding of electric motor stack manufacturing, Carpenter Electrification delivers the materials technology needed to optimize aircraft performance and maximize return on investment.

Ready to explore how advanced materials can transform your electric aircraft? Connect with one of our experts to discuss your specific performance requirements and discover solutions to deliver measurable improvements to your bottom line.

Carpenter Electrification Blog

High-Strength Hiperco® with Low Core Loss: Meeting the Demands of High-Speed Motor Design

The Materials Challenge in Power Dense Motor Design

Understanding Hiperco® Technology

Prime and Prime Plus: Two Specialized Grades from One Material

Measurable Performance Advantages

Proprietary Advanced Processing Methodology

Implementation Considerations

Technical Expertise and Support

Looking Ahead

Hiperco® Prime Plus: Redefining Stator Efficiency in High-Performance Motors

Understanding Core Loss and Its Impact

Hiperco® Prime Plus: A New Benchmark for Stator Materials

Quantifiable Performance Advantages

Application Specific Benefits

Design Considerations for Implementation

Manufacturing and Quality Considerations

The Path Forward

Hiperco® Prime: Engineering High-Strength Solutions for High-Speed Rotor Applications

Understanding Rotor Stress in High-Speed Motors

Hiperco® Prime: Strength Meets Magnetic Excellence

Performance Capabilities and Benefits

Application Advantages Across Industries

Design Implementation Strategies

Enabling the Future

The Future of Air Travel: What 2025 Taught Us — and What’s Ahead in 2026

2025 Industry Milestones

What to Know About eVTOLs

Things to Consider for Future Impact

Infrastructure and Charging Solutions

Public Perception

Environmental Impact

Government Laws and Regulations

What is the Future of Air Travel for eVTOL?

Reach Out to Discuss Electric Aircraft

The Science Behind Thin Laminations for High-Frequency Motor Applications

Why Traditional Designs Fall Short

Understanding Frequency-Induced Losses in Motor Cores

Eddy Current Physics at High Frequencies

The Crossover Point

Modern Applications Driving Ultra-Thin Lamination Demand

SiC/GaN Inverter Requirements

Additional High-Frequency Applications Across Industries

Calculating Optimal Thickness

Frequency Bands and Recommendations

Using Loss Data for Selection

Material Processing Advances for High-Frequency Performance

Manufacturing Challenges: Producing Ultra-Thin Laminations at Scale

Cost vs. Performance: When Thinner Isn't Always Better

Partnering for High-Frequency Motor Excellence

Past to Future: The Electric Powertrain Revolution Reshaping Performance Cars

The Evolution of Electric Vehicle Performance

From Pioneers to Today's 1000+ HP Capabilities

The Advanced Magnetic Materials Advantage

Power Density and Motor Size

Torque and Acceleration

Efficiency and Range

System-Level Benefits

The Road Ahead: 2025 and Beyond

Ready to Push the Boundaries of Electric Motor Performance?

Choosing the Right Alloy: Comparing Magnetic Materials for Electric Motors

Understanding Magnetic Material Requirements

Comparing Material Options

Silicon Steel (electrical steel)

Hiperco**®** Alloys

Hypocore**®** Alloys

Material Selection Framework

1. Performance Requirements Assessment

2. Frequency Considerations

3. Size and Weight Constraints

4. Thermal Management Considerations

5. Economic Considerations

Application-Specific Material Selection

Manufacturing Considerations

Quality Assurance Framework

The Path to Superior Performance

Transforming Electric Motors Through Advanced Materials

Understanding the Motor Optimization Tradeoff

How Material Selection Shifts the Balance

The Material Science Behind High-Performance Motors

Hiperco® Alloys

Hypocore® Alloys