关键词: 永磁同步电机, 电磁干扰, 高频方波注入, 电磁干扰高频预测模型

Abstract: Based on the three elements of electromagnetic interference( EMI) ,an EMI high-frequency prediction model for the drive system of low-speed permanent magnet synchronous motor( PMSM) was established, and a high-frequency square wave injection control system was constructed. Based on the characteristics of low-speed PMSM system,such as large common-mode voltage and long cable between driver and motor, a high-frequency prediction model was established to analyze its EMI change. According to the principle of EMI influence on rotor position and speed error estimation, it was verified through simulation that compared with the normal-speed small motor system,the EMI amplitude and frequency of low-speed PMSM system were larger,and the influence on motor state estimation was more significant. This study provides a theoretical basis for analyzing the mechanism of EMI influence on low-speed and low-frequency PMSM state estimation.

Key words: permanent magnet synchronous motor, electromagnetic interference, high-frequency square wave injection, electromagnetic interference high-frequency prediction model