Analysis of Influence of Current Harmonic Distribution Optimization in Noise of Built-in Permanent Magnet Synchronous Motor

The power supply form of built-in permanent magnet synchronous motor (IPMSM) can be divided into sine electric power supply and inverter power supply according to the speed regulation requirements in different application scenarios. When the motor is powered by the inverter, the current harmonics in the winding will introduce additional radial electromagnetic force, which will aggravate the motor vibration and noise. Based on the mechanism of radial electromagnetic force generation in the case of stator current harmonics of the motor, the influence of low-frequency current harmonic amplitude on noise was analyzed. In the case of inverter power supply, a specific subharmonic suppression algorithm was adopted to reduce the influence of 7th harmonic on noise, and the motor noise at 3380HZ was reduced from 69.908dB to 66.573dB. The effectiveness of this method is proved.