Structure of the PM Synchronous Motor for Low Iron Loss Characteristic in the Highspeed Region

摘要

High efficiency motors driven at high speed are required in various applications. However, these motors suffer from excessive iron loss in the high-speed region. A number of structures have already been suggested for high speed drive. In this research, the motor with the concentrated winding stator and the motor with the slot-less stator are compared with respect to high speed drive characteristics. The speed-power characteristics and speed-efficiency characteristics in the high-speed region of the motors are revealed.