YASA develops a compact motor that delivers four times the power of a Tesla motor and 40% better performance than the previous generation
YASA, a wholly owned subsidiary of Mercedes-Benz and a leading designer and manufacturer of axial-flux electric motors in the UK, has announced that it has significantly improved its own unofficial world record for power density in an electric motor.
YASA smashes own unofficial power density world record pushing state-of-the-art electric motor to staggering new 59kW/kg benchmark - YASA Limited
Tiny electric motor is as powerful as four Tesla motors put together and outperforms record holder by 40%
https://supercarblondie.com/electric-motor-yasa-more-powerful-tesla-mercedes/
YASA was founded in 2009 as a spin-out company from Oxford University by current Chief Technology Officer (CTO) Tim Woolmer. At the time, most electric vehicles (EVs) used existing radial motor technology, but YASA pursued the potential of smaller, lighter, and higher-torque axial flux motors.
Axial flux motors had the potential to be lighter, smaller, and have higher torque, but they could not be manufactured by stacking laminated steel sheets like conventional radial motors, which meant they had issues such as reduced cooling capacity and complicated windings. These issues were overcome by dividing the motor into individual 'pole pieces' and using soft magnetic composites (SMC), which can be pressed into various 3D shapes at low cost.
Following early success, the company opened its first production facility in the UK in 2018, and in 2019 Ferrari became its first production OEM customer with
Ferrari SF90 Stradale - Official Video - YouTube
YASA became a wholly owned subsidiary of Mercedes-Benz in 2021 and is responsible for developing motors for AMG's high-performance EV platform, and in recent years has also partnered with Lamborghini.
YASA announced a new prototype motor on October 22, 2025. It weighs just 28 pounds (approximately 12.7 kg) and boasts a short-term peak power output of 750 kW (over 1,000 horsepower). This is 40% more than YASA's previous record of 13.1 kg weight, 550 kW (738 horsepower), and 42 kW/kg power density. YASA also reports that the power density reached 59 kW/kg, an unofficial world record.
YASA claims that the new motor's peak output of 750 kW is more powerful than two Tesla Model 3 Performances (460 horsepower peak output). It's also nearly four times more powerful than the rear motor (rated at 200 kW) in the European Tesla Model Y Standard. YASA CEO Jörg Miska said, 'This new motor has three times the performance density of today's leading radial motors.'
In addition to short-term peak output, the motor is also capable of continuous output of 350kW to 400kW. This prototype is not theoretical; it is already operational and has been tested on a dynamometer. According to YASA, the new motor was realized without the use of expensive special materials, and mass production is possible as soon as demand is met.
YASA is building a mass production facility for axial flux motors in Oxford, UK, in May 2025.
YASA Opens UK's First Axial-Flux Motor Super-Factory - YouTube
Reducing the weight of the motor is extremely important for EVs, as it directly leads to a reduction in the weight of the entire vehicle, contributing to longer driving range and improved efficiency. YASA's technology is already being used in high-performance cars such as the Ferrari 296 GTB , Lamborghini Temerario , and Mercedes-AMG GT XX .
Lamborghini Temerario: Best-in-class performances - YouTube
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