Pole Width Modulation-based Low Vibration and Noise Design for Interior Permanent Magnet Synchronous Motor

For the integer slot interior permanent magnet synchronous motor (IPMSM), slot number order force is an important source of the zeroth mode vibration. Pole width modulation technology is used to modify the rotor, restrain slot number order force, and realize the low vibration and noise design. Firstly, the mathematical model of the temporal and spatial characteristics of electromagnetic force of the 72-slot/22-pole IPMSM is deduced. Then, the source of 72nd-order electromagnetic force is analyzed. Subsequently, pole width modulation technology is used to optimize the 72nd-order electromagnetic force, and the final optimization scheme is adopted by simulated validated. Finally, the multi-physical simulation model of electromagnetic vibration and noise is established to predict the electromagnetic force, modal characteristics, vibration response and radiation noise of machine are analyzed. Vibration displacement and sound pressure level are compared between the existed and proposed machine. The results verify the effectiveness of the proposed method. A new method for low vibration and noise design for IPMSM is provided.