Influence of Inverter Output Voltage Harmonic on Surface Mounted Permanent Magnet Synchronous Motor Performance

The application of inverter is becoming more and more widespread in surface mounted permanent magnet synchronous motor (SMPMSM). A large number of voltage harmonics can be generated by the inverter. The electromagnetic torque, loss and air-gap magnetic density of SMPMSM are affected by voltage harmonic. In order to analyze its influence, taking a 3kW 1500r/min SMPMSM as an example, a 2-D transient electromagnetic field model is established. The correctness of the model is verified by comparing the experimental data with the calculated data. Firstly, the finite element method is used to calculate the electromagnetic field of the SMPMSM, and the performance parameters of SMPMSM are obtained. Based on these parameters, the influence of voltage harmonic on motor performance is analyzed quantitatively. Secondly, the influence of the voltage harmonic on the air-gap magnetic field is analyzed, and the influence degree of the time harmonic on the air-gap magnetic field is determined. At the same time, torque ripp...