Design of High-speed Permanent Magnet Motor for Energy Storage Flywheel

Abstract

As the core component of flywheel energy storage system, permanent magnet motors need to possess characteristics such as high efficiency, high torque and low heat generation to meet the performance requirements of the motor for the flywheel energy storage system. To achieve the above requirements, this paper designs an energy storage flywheel motor with a rated power of 500W and a rated speed of 10000r/min, and proposes a new stator-less coreless permanent magnet synchronous motor structure for energy storage flywheels. The rotor magnetic circuit of the motor is optimized through multi-objective design. Firstly, a simulation model of the new motor is established. Then, finite element analysis is conducted using Maxwell. Secondly, the rotor magnetic circuit is optimized using the improved NSGA-II algorithm. Finally, finite element simulation is built for verification. The research shows that the finite element simulation results indicate that, under the condition that the maximum envelope volume of the motor remains unchanged, the average output torque of the motor increases from 428.9 mN/m to 451.2mN/m, an increase of approximately 5.2%. The torque fluctuation decreases from 64.0 mN/m to 61.8 mN/m, a reduction of 3.4%. The new structure effectively reduces the heat generation of the motor and significantly improves the overall performance of the motor. It has certain reference significance for the design of permanent magnet motors for energy storage flywheels.