A new electric motor developed by YASA, a Mercedes-Benz subsidiary, promises to significantly reduce the weight of future EVs while boosting their performance and range. The innovative design, leveraging axial flux technology, achieves an unprecedented power-to-weight ratio, potentially cutting up to 1,100 pounds (500 kg) from vehicle mass.
The Power of Axial Flux
Traditional electric motors use radial flux technology, resulting in a cylindrical shape with the stator surrounding the rotor. YASA’s axial flux design flips this approach, creating a disc-like motor resembling a pancake. This allows for a much more compact and lightweight build. The latest iteration weighs just 28 pounds (12.7 kg) but can deliver up to 1,000 horsepower instantaneously, or a sustained 469-536 hp. This surpasses YASA’s previous record of 738 hp from a 29-pound motor.
This isn’t just about raw power; it’s about efficiency. Lighter vehicles require less energy to move, extending range.
For context, the 2025 Nissan Leaf’s motor produces 214 hp, while a high-performance Tesla Model S needs three motors to reach around 1,020 hp. YASA’s motor packs comparable power into a fraction of the weight.
Weight Reduction & Regenerative Braking
The most significant impact is weight reduction. Replacing traditional drivetrains with these in-wheel motors could save around 440 pounds (200 kg). For vehicles designed from the ground up, the savings could climb to 1,100 pounds (500 kg). This is because the system also integrates advanced regenerative braking.
Regenerative braking captures energy lost during deceleration and converts it back into electricity, recharging the battery. This process can reduce reliance on friction brakes, further reducing weight and space. The system effectively turns the wheels into generators, slowing the car while simultaneously powering the battery.
Scalability and Future Implications
YASA emphasizes that this design is scalable and doesn’t rely on rare materials, making it viable for mass production. The implications are far-reaching:
- Increased Range: Lighter vehicles consume less energy.
- Enhanced Performance: More power in a smaller package allows for quicker acceleration.
- Design Flexibility: Reduced powertrain size frees up space for aerodynamics or interior comfort.
This breakthrough isn’t merely an incremental improvement; it’s a fundamental shift in EV motor technology. By streamlining the powertrain, manufacturers can create longer-range, more powerful, and more efficient electric vehicles. The new design promises to reshape the future of EV engineering, making high-performance electric mobility more accessible.
