Review of Driving Technology for Permanent Magnet Synchronous Motors Without Electrolytic Capacitor

doi:10.12141/j.issn.1000-565X.240274

Abstract

Abstract:

Due to their small size, low cost and high reliability, permanent magnet synchronous motors have been widely used in the fields of industrial production, transportation and household appliances. Electrolytic capacitor is the middle part of drive system connecting the power grid and the motor. Its life is easily affected by external factors such as environmental temperature and humidity, which seriously restricts the stability and reliability of the motor products. Therefore, the drive system without electrolytic capacitor has become the research hotspot at home and abroad. Scholars have proposed various control strategies for achieving high power factor, suppressing current harmonics, and stabling motor operation. In this paper, the factors affecting the power quality and motor performance of drive system without electrolytic capacitor are analyzed, the advantages and disadvantages of different control strategies are compared, the control strategies for optimizing system performance are summarized, and the driving technology of permanent magnet synchronous motor without electrolytic capacitor is prospected. There comes to the following conclusions: at present, the current power quality is improved mainly through the optimization of motor control algorithm, but the existing methods, such as indirect power control, direct power control, compensation phase current’s non-ideal characteristics and regenerative energy control, all have some limitations; the improvement of motor performance is mainly carried out by the traditional control strategies based on constant bus voltage, such as weak magnetic control and over-modulation, while simultaneously suppressing beat phenomenon and ensuring stable operation of the motor, thus, it is necessary to further consider whether the power factor and current harmonics meet the standards in the subsequent research. Moreover, it is pointed that the comprehensive performance control of non-electrolytic capacitor motor, which takes into account both power quality and motor performance, is the biggest problem faced by the current non-electrolytic capacitor control system. Therefore, it is necessary to carry out a collaborative control for the power grid and the motor to rationally allocate functions and avoid conflicts.

Key words: permanent magnet synchronous motor, electrolytic capacitor, drive system, power quality, motor performance

CLC Number:

TM341

WANG Xiaohong, LIANG Yu, PAN Zhifeng, LU Mingqing, LIU Manxi. Review of Driving Technology for Permanent Magnet Synchronous Motors Without Electrolytic Capacitor[J]. Journal of South China University of Technology(Natural Science Edition), 2024, 52(12): 93-108.

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控制器类型	跟踪性能	参数整定难度	稳定性
PI控制器	较差	较难	较差
PI+重复控制器	较好	困难	很差
PR控制器	较好	一般	好
PIR控制器	好	简单	好

控制策略类型	实施难度	功率因数	电流谐波	电机效率
间接控制法	简单	低	高	高
直接控制法	困难	高	低	低

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[2]	XU Tao SHEN Yan-hua ZHANG Wen-ming GAO Yu. Performance Analysis of Drive System of Mine Trucks Based on Hybrid Transmission System [J]. Journal of South China University of Technology (Natural Science Edition), 2017, 45(5): 59-67.
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