YASA Limited, now part of Mercedes-Benz, is revolutionizing the electric vehicle landscape with its astonishingly power-dense electric motor. This British company’s latest prototype boasts a weight of just 12.7-28 pounds while delivering a staggering peak power output of 750-1005 horsepower (550-750 kW), achieving a record-breaking power density of up to 59 kW/kg. This remarkable feat not only sets new benchmarks but also signals a shift in how performance is perceived in the electric vehicle segment.

Innovative Design: Axial Flux vs. Radial Flux

At the core of YASA’s design philosophy is the axial flux motor architecture, which positions the magnetic flux parallel to the shaft axis. This design contrasts sharply with traditional radial flux motors, where the flux flows perpendicularly. The advantages of YASA’s approach include:

• Reduced weight: Up to 50% lighter than radial motors.
• Higher torque density: Achieving 2-4 times more torque from a smaller package.
• Compact design: 20% less depth compared to radial motors.

This innovative architecture allows for a much lighter motor without sacrificing performance, essential for high-performance electric vehicles.

Magnetic Mastery: The Halbach Array

YASA employs an advanced Halbach Array magnet configuration, optimizing the magnetic field to enhance torque and efficiency. By arranging magnets in a pattern that maximizes field strength on one side while minimizing it on the opposite, YASA has created a motor capable of:

• Higher speeds and acceleration.
• A lightweight composite carbon rotor, reducing overall mass.
• Eliminating the need for heavy iron backplates in rotors.

This exceptional engineering choice contributes significantly to the motor’s power density and efficiency, paving the way for future applications in high-performance EVs.

Cooling and Control: Keeping the Power in Check

To sustain the peak performance of this motor, YASA has developed advanced cooling techniques. Utilizing oil-immersed edge-wound copper windings, the design minimizes thermal losses and allows for:

• Continuous power output of 469-536 hp versus the peak of 1005 hp.
• Higher current handling, maintaining performance without overheating.

Additionally, YASA has introduced a custom dual inverter designed to optimize control, surpassing third-party units in performance capabilities.

Future Implications: Shaping the EV Landscape

YASA’s innovations are not just about breaking records; they represent a significant leap forward in electric vehicle technology. Targeting performance EVs, the company envisions:

• In-wheel motors that could yield over 4000 hp in total.
• Advanced regenerative braking systems, potentially eliminating the need for rear brakes.
• A scalable production model expected to materialize in 2-3 years.

The acquisition by Mercedes-Benz places YASA’s technology at the forefront of the EV market, promising lighter, more efficient propulsion systems for future hypercars and beyond.

As YASA continues to push the boundaries of electric motor technology, the automotive industry stands on the cusp of a new era where performance and efficiency go hand in hand.