YASA, a company specializing in axial flux electric motor technology, has announced an unofficial world record for electric motor power density with its latest prototype. Recent testing of a 12.7 kg axial flux motor prototype yielded a short-term peak output of 750 kW, resulting in a recorded power density of 59 kW/kg.

This breaks YASA’s own previous mark of 42 kW/kg, achieved with a 13.1 kg prototype that peaked at 550 kW earlier in the summer of 2025. The company says the continuous power output for the new motor is estimated to be between 350 kW and 400 kW.

More: A closer look at axial flux motors

The design uses no exotic materials and is engineered for compactness and scalability. YASA says the prototype employs precision engineering, advanced thermal management, and optimized packaging to achieve these results.

The motor has been developed and tested at YASA’s Oxford Innovation Centre, with support from the Advanced Propulsion Centre in the United Kingdom. YASA reports that the prototype is not a simulation or conceptual design, but a fully operational motor currently undergoing extended dynamometer testing.

“The early results are extremely encouraging,” said Simon Odling, Chief of New Technology, YASA.”The motor’s performance on the dyno has exceeded even our most optimistic simulations. As well as its incredible peak power and overall power density, we estimate this new motor will be able to deliver all-important continuous power in the region of 350 kW-400 kW. This is real hardware, in real life, delivering real data – and it’s performing beautifully.”

YASA targets the high-performance automotive sector with this technology, aiming to provide compact, efficient electric propulsion systems for premium electric vehicles.

Source: YASA