High-Frequency Electromagnetic Vibration Analysis and Modulation Parameter Optimization of PMSMs Driven by Inverters

The utilization of inverters and pulse width modulation (PWM) technology in driving permanent magnet synchronous motors (PMSMs) introduces high-frequency sideband electromagnetic force. Consequently, the risk of PMSMs resonance inevitably increases, leading to disruptions in the operating state and increased noise radiation. Two-dimensional (2-D) sideband electromagnetic force, torque ripple, and electromagnetic vibration of PMSMs with integral-slot and fractional-slot winding arrangements are studied in this article. The torque ripple caused by sideband harmonic currents is derived. Rules to reduce electromagnetic vibration are proposed. The results indicate that the sideband electromagnetic forces have both low- and high-frequency characteristics. Torque ripple shows a new high-frequency characteristic. Experimental findings validate the effectiveness of the proposed rules for optimizing electromagnetic vibration, resulting in an 11.1 dB reduction in the 3.5–6.5 kHz band.