A low-speed high-torque permanent magnet motor for electric scooters

This paper proposes a new low-speed high-torque permanent magnet motor for electric scooters. The designed outer-rotor permanent magnet motor is integrated into the wheel-rim on the tire which is limited to the space. In the motor design optimization, a non-linear finite element analysis (FEA) method is applied to extract maximum motor constant and parameters. With the simulation results, a prototype motor with 1.42kW and 20-poles was fabricated and tested on the electric scooter for validation. Through experimental tests, the overall efficiency achieved 87% at rated speed to confirm the validity of the design optimization. The detailed test results have been presented.