Sensorless Control Strategy of Permanent Magnet Motor Based on Moving Average Filtering

doi:10.11985/2021.04.012

Abstract

Abstract:

Sensorless control of PMSM can significantly improve the robustness and reliability of the drive system and reduce the cost. Aiming at the problem of system performance degradation caused by filtering in sensorless control based on high frequency signal injection, an improved sensorless control strategy based on moving average filtering is proposed. First of all, based on the analysis of the high frequency signal processing part of current loop and the rotor position based on observed performance impact, a kind of sensorless control method based on moving average filter is put forward. Instead of the position error in the feedback path in the current loop and link of the traditional filter, the moving average filter is used in this method, the control performance without sensor system is improved. Experimental results show that the harmonic content of feedback current is reduced and the bandwidth of the system is effectively improved in this method. At the same time, the high frequency current can be extracted effectively and the dynamic performance of position observation can be improved.

Key words: Permanent magnet synchronic motor, sensorless control, moving average filter, high frequency injection

CLC Number:

TM561

ZHANG Kaiji, ZHANG Guoqiang, LI Yuxin, WANG Gaolin, XU Dianguo. Sensorless Control Strategy of Permanent Magnet Motor Based on Moving Average Filtering[J]. Journal of Electrical Engineering, 2021, 16(4): 93-100.

Figures/Tables 16

References 17

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参数	数值
额定功率/kW	7.5
额定电压/V	380
额定电流/A	20
额定转矩/(N·m)	48
转动惯量/(kg·m²)	0.017 33
额定转速/(r/min)	1 500
定子电阻/Ω	0.273
定子电感/mH	1.05
极对数	4