Permanent magnet eddy current loss analysis of the permanent magnet spherical motor

The analysis of the eddy current loss in the permanent magnet (PM) is an important research topic of the PM spherical motor. The PM eddy current loss can lead to the increase of PM temperature and the change of magnetism, and these will decrease the efficiency of the motor and deteriorate its performance. Firstly, this paper does the eddy current loss theoretical derivation of the PM finite element model, and then analyses the PM eddy current loss by using the finite element method. Under the no-load condition, this paper shows the characteristics of PM eddy current loss, and also analyses the effects of different motor structure parameters, different PM magnetizing methods and different speed on eddy current loss, the results show that the optimization of the motor parameters can reduce the eddy current loss efficiently, and this paper will provide the theoretical basis for the optimization design of the PM spherical motor.