Analysis of the Sideband Electromagnetic Noise in Permanent Magnet Synchronous Motors Generated by Rotor Position Error
Wenzhe Deng, Shuguang Zuo
Abstract
In this article, the influence of the rotor position error generated by the resolver on the electromagnetic noise of permanent magnet synchronous motors (PMSMs) is analyzed. The motor noise is mainly caused by the electromagnetic force acting on the surface of the stator teeth or permanent magnets. First, the influence of the rotor position error on current harmonics is deduced theoretically. The spatial and temporal characteristics of the electromagnetic force are then analyzed. The results show that the rotor position error will introduce extra sideband frequency harmonics to the current and electromagnetic force. This will lead to more abundant noise harmonics. The field-oriented control model and the electromagnetic finite-element model are then established to simulate the influence of the rotor position error on current harmonics and electromagnetic force. Finally, a test is carried out to capture the phase current and noise spectrum. Both the simulation and test results are consistent with the theoretical analysis results. This study can give a reference to the source identification and optimization of acoustic performance for PMSMs in electric vehicles.