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In permanent magnet motor, the rotor eddy current loss can make the rotor temperature rise, affect the efficiency of motor performance and even lead to permanent magnet demagnetization. In order to improve the efficiency of the motor and protect the magnet which is core part of the motor, some ways must be adopted to optimize the motor to solve the problem of eddy current. According to the problem of eddy current loss of permanent magnet motor, the principle of eddy current loss was simply analysed in this paper. The eddy current loss can be influenced by the shape of magnet and rotor surface, structure of rotor, slit width of the stator, rotor shield (sheath), air-gap length etc. Some methods of optimizing the eddy current loss were introduced for the further study of the eddy current loss. It is also helpful for the efficiency research of the motor for electric vehicles.

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