Sideband Electromagnetic Vibrations in Interior PMSM With High Frequency Pulsating Injection Sensorless Control

High frequency (HF) voltage injection is the main method to realize zero-low speed sensorless control of interior permanent magnet synchronous motor (IPMSM). However, additional signal injection interacts with the fundamental frequency to generate new voltage components, and new sideband harmonic components will be introduced under space vector pulse width modulation (SVPWM), resulting in extra electromagnetic vibrations and acoustic noises, which has a serious impact on vibration performance of the motor. The sideband harmonic components and the main frequency distribution of electromagnetic force waves generated by control of pulse voltage injection under the space vector pulse width modulation are comprehensively analyzed in this paper, which provides a basis for the selection of the frequency and amplitude of the injection voltage. The experiment platform is built to verify the correctness of the theoretical analysis. The electromagnetic vibrations and acoustic noises can be significantly reduced by appropriately matching the injection signal frequency with the operating speed and motor modal frequency.