关键词: 牵引电机, 永磁直驱, 输出转矩, 转矩密度

Abstract: In view of the problems existing in the existing metro asynchronous traction motor and gearbox operation mode, a metro direct drive permanent magnet synchronous traction motor (MD-PMSM) suitable for metro operation was proposed. The design method of MD-PMSM operation principle and structural parameters was given, and its 2D and 3D finite element simulation models were established, which were simulated and optimized through parameterized rotor magnetic circuit structure. The simulation analysis of the optimized MD-PMSM in terms of traction, braking and heat dissipation was carried out. The results show that the output torque of the optimized MD-PMSM is about 33% higher than that before optimization. Compared with the existing asynchronous motor, the MD-PMSM has the advantages of high torque density and high efficiency. It can replace the existing asynchronous motor and gearbox operation mode to achieve low speed and high torque direct drive.

Key words: traction motor, permanent magnet direct drive, output torque, torque density