12.7 kg Axial Motor Reaches 1,000 HP and Redefines Power Density

A 12.7 kg axial motor achieves a peak power of 750 kW (~1,020 hp) with record power density, pointing towards advancements for high-performance EVs.

12.7 kg Axial Motor Sets New Power Record

A compact electric motor, weighing only 12.7 kg, delivers a peak power exceeding 750 kW, which is equivalent to just over 1,000 hp. YASA, a British electric motor manufacturer linked to Mercedes-Benz and based in Oxford, presented its second prototype within a few months.

How This Design Works

The secret lies in the axial flux arrangement, which organizes the magnetic components differently from traditional designs, allowing for more power in a smaller package. The axial flux layout combines advanced thermal engineering and optimized packaging.

Performance in Numbers

• Peak: 750 kW (approx. 1,020 hp) with a density of 59 kW per kg.
• Continuous Operation: Between 350 and 400 kW (approx. 469–536 hp), representing a density of about 27.6 kW/kg.

In recent context, high-density rivals have achieved a maximum of around 13–14 kW/kg at peak, such as H3X and Equipmake, as well as Donut Labs with 15.8 kW/kg. YASA's new unit surpasses these figures multiple times over, reaching almost four times the level of the best competitors.

Comparison Between High-Density Motors

• Evolito D250: ~28 kW/kg
• Helix SPX177: ~25.4 kW/kg
• H3X/Equipmake: ~13–14 kW/kg
• Donut Labs: 15.8 kW/kg

YASA's demonstration significantly raises the benchmark for axial motors, surpassing rivals in power density.

Applications, Production, and Future Vision

The motor does not rely on exotic materials, prioritizing scalability through precision engineering, thermal management, and efficient packaging. The development received support from the UK's Advanced Propulsion Centre, lending institutional backing.

Mercedes-Benz has already confirmed the use of YASA axial motors in an upcoming high-performance AMG, although the final model may differ from the test bench prototype. Unlike purely concept programs, YASA's approach points towards a scalable trajectory.

Implications for the Industry

If proven in production, this design could reduce weight and allow for the integration of multiple motors without penalties, paving the way for more flexible platforms, including high-performance cars and, in the future, mass production. The thermal management and packaging techniques presented may influence driveline design in the coming years.

What do you think? Can this type of motor transform high-performance vehicle design or will it remain niche? Leave your opinion in the comments.