A Study on the Reduction of Eddy Current Loss at 45kW-class MG-PMSM for tram

A recent problem in Korea Railroad is the reliability of railway vehicle parts. When the set cycle arrives, maintenance is carried out. In the case of the propulsion system, the drive system occupies a significant part, and the inspection of the components that make up it directly affects the operation, so it can be said to be a really important part. In gears, it is uncertain to predict the lifespan of gears, mainly due to various problems caused by direct contact. In the case of motors, a semi-enclosed air cooling method is used as a usual cooling method in railway vehicle, which tends to shorten the maintenance period of the motor than the predicted period. So traction motors and gears in drive system, it is checked frequently, and this consumes quite a lot of time, money, and manpower. To solve this problem, this paper propose the Magnetic-Geared Permanent Magnet Synchronous Motor(MG-PMSM) for tram in which a magnetic gear and a fully enclosed permanent magnet synchronous motor form a system, and also propose a method to reduce eddy current loss occurring in the topology.