In this paper, the driving characteristics of an electromagnet-assisted ferrite magnet motor (EMaFM) are investigated using a 1.5-kW prototype machine. The EMaFM is a new type of synchronous motor, which combines a ferrite magnet motor with an electromagnet motor. Finite element analysis and experimental results show the following. 1) A wide constant power range as well as high torque at low speeds can be achieved by assisting the torque with the built-in electromagnet motor. 2) It is possible to reduce the losses and improve the efficiency by adjusting the field current according to the operating conditions.
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