摘要
PrefaceAll the motors used for electric driven vehicles which run on railway or road are called traction motors.So far as traction motor is con-cerned,the dimensions of its installation space are limited by the gauge of railway and the wheel diameter of the vehicle,therefore it requirescompact structure.Since the vehicles bear large shock and jerk while running,the structure of the traction motor should have high mechanicalstrength and stability.Due to the awful conditions of the operation environment,not only the traction motor is easily to be wetted and to
