What's equally impressive as the output is the weight of the motors. The 845-hp version measures 21 inches in diameter and is ...

Donut Lab offered more details about its donut-shaped electric motors, which promise a much higher power and torque density than classic stator-rotor motors ...

Donut Lab, a subsidiary of Finland-based Verge Motorcycles, claims to have a motor with the highest power density of any such ...