volume | PIER Journals

Abstract

Position encoders for motors are susceptible to electromagnetic interference (EMI) in industrial environments, which distorts position signals and degrades motor control accuracy. This paper focuses on two prevalent types of EMI: the coupling interference of switching frequency from motor drives and wideband electromagnetic background noise. To analyze their impact, a simulation platform for a permanent magnet synchronous motor (PMSM) control system is established, examining the distortion of the encoder's electrical angle signal under varying coupling voltages. A filtering suppression strategy for the position angle, based on a phase-locked loop (PLL), is proposed and its effectiveness is thoroughly analyzed. Simulation results indicate that the coupling interference of switching frequency induces periodic spike pulses in the encoder's electrical angle waveform, whereas wideband background noise causes continuous, random fluctuations. The proposed suppression strategy demonstrates significant efficacy, achieving maximum reduction rates in electrical angle signal distortion of 80% and 80.8% for the two interference types, respectively. This method effectively mitigates the impact of electromagnetic interference on encoder signal integrity.

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Dr. Chuan Xiang

Dr. Jinghao Jiao

Dr. Deyu Zhai

Prof. Shukuan Zhang