Zero-Order Electromagnetic Vibration Suppression of Permanent Magnet Synchronous Motor With Harmonic Currents Injection

With the extensive application of permanent magnet synchronous motors (PMSMs), their vibration and noise performance have also received increasing attention. The traditional reducing vibration method by adjusting the motor topology is not universal and costly. In addition, the zero-order mode of PMSMs always has a low natural frequency, which likely interacts with the zero-order electromagnetic force waves to increase vibration. Therefore, a novel method is proposed to reduce the zero-order vibration of PMSMs by injecting harmonic currents. Based on the zero-order natural frequency of the PMSM stator, this method will selectively adjust the frequency and amplitude of injected harmonic current to reduce vibration. The theoretical basis, simulation verification, and experimental implementation of the novel method are thoroughly researched, exhibiting its ability to reduce zero-order vibration of PMSMs.