A method based on synchronization strategy for suppressing vibration noise by injecting square wave harmonics
This paper presents an optimization method based on a synchronization strategy for suppressing vibration noise in perma-nent magnet synchronous motors(PMSM)through square wave harmonic injection,to address the frequency aliasing issue that occurs at the injected harmonic current frequency near the Nyquist frequency in traditional harmonic injection methods.It began with a noise analy-sis for PMSMs,and elucidates on the suppression mechanism,control calibration,and frequency aliasing associated with traditional har-monic injection methods.In the subsequent sections,the implementation principle of the proposed optimization method based on the syn-chronization strategy was expounded.The aim was to maintain synchronization between the inverter switching frequency and the inject-ed square wave harmonic current frequency.This synchronization facilitated the enhancement of harmonic current amplitude and stabili-zation of the harmonic current order.In the final part,an experimental comparison was elaborated,showcasing that the optimization method centered on the synchronization strategy effectively alleviated frequency aliasing.Results indicate an average reduction of 6.4 dB in 48th order noise and 5.6 dB in 96th order noise,surpassing the outcomes obtained with traditional harmonic injection methods.
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