Comparative study on FEM of eddy current loss excitation of SPMSM
Pulse width modulation(PWM)technology is widely used in the control of surface perma-nent magnet synchronous motor(SPMSM).However,there is a large amount of eddy current loss in permanent magnet under PWM excitation.A simplified finite element method(FEM)was proposed to obtain the above eddy current loss efficiently and accurately.Firstly,taking three permanent magnets with different number of axial segments as the research object,the eddy current loss calculation re-sults of the simplified method,2D FEM and 3D FEM under the same working condition were com-pared.The results show that the error between the simplified method and 3D FEM is less than 3％,and the calculation time is much less than 3D FEM.Secondly,based on the characteristics that eddy current loss decreases with the increase of axial segment of permanent magnet,SPMSM with different number of axial segment of permanent magnet was used to separate eddy current loss under the condi-tion of blocked rotation,and the calculation validity of simplified method was verified.Finally,the copper loss of the motor was calculated by measuring the resistance of motor,and the eddy current loss difference was corrected to further verify the accuracy of the simplified method.
万方数据
维普
