Influence of Output Voltage Harmonic of Inverter on Loss and Temperature Field of Permanent Magnet Synchronous Motor

In order to better start and control the surface-mounted permanent magnet synchronous motor (SMPMSM), the inverter is widely used in the SMPMSM. However, a large number of voltage harmonics are generated by the inverter, which can directly affect motor loss and temperature. In order to analyze its influence, taking a 3 kW, 1500 r/min SMPMSM as an example, a 2-D finite-element model is established. The correctness of the model is verified by comparing the experimental data with the calculated results. First, the coupling method of the electromagnetic field and temperature field is used to analyze the electromagnetic field and the temperature field of the SMPMSM, and the data of loss and temperature rise are obtained. Based on these calculation results, the influence of voltage harmonic on SMPMSM is analyzed quantitatively. Second, when the voltage harmonics contained different harmonic orders and amplitudes, the core loss, eddy current loss, and temperature rise are studied. The variations of losses and temperature rise are obtained. Finally, the change mechanism of eddy current loss is revealed by studying the eddy current density. The conclusions of this paper can provide reliable theoretical guidance for improving the motor performance.