Fault-tolerant Vector Control of Five-phase Permanent Magnet Synchronous Motor of Non-sinusoidal Back EMF

doi:10.11985/2021.04.014

Abstract

Abstract:

The multi-phase permanent magnet synchronous motor drive system has strong fault-tolerant operation ability. The non-sinusoidal back-EMF five-phase permanent magnet synchronous motor is taken as the research object. By adopting the reduced order transformation matrix, the torque equations at fundamental and the third harmonic space are constructed under the single-phase fault. And in order to eliminate the second and fourth torque ripples under the fault, the method of selecting the third harmonic current injection rate is analyzed, and the reference current are optimized according to the principle of minimum copper loss and maximum torque. In addition, to address the inability of traditional PI controller to track the AC reference current in an accurate way, a Quasi-proportional resonance (QPR) +PI controller is designed on the basis of PI control to ensure the accuracy in tracking the AC reference current in the synchronous coordinate system. The simulation results demonstrate that the torque ripple are effectively suppressed, and the QPR + PI controller can accurately track the AC current signal.

Key words: Five-phase permanent magnet synchronous motor, third harmonic current, torque ripple, fault-tolerant control, quasi-proportional resonant controller

CLC Number:

TM561

ZHOU Changpan, LIU Haifeng, JING Guoxiu, SUN Xiangdong, LIU Tan, SHI Benben. Fault-tolerant Vector Control of Five-phase Permanent Magnet Synchronous Motor of Non-sinusoidal Back EMF[J]. Journal of Electrical Engineering, 2021, 16(4): 108-119.

Figures/Tables 24

References 14

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参数	数值
定子电阻r_s/Ω	0.5
直轴电感L_d1/mH	8.4
交轴电感L_q1/mH	8.4
永磁磁链的基波幅值ψ_f1/Wb	0.32
永磁磁链的三次谐波幅值ψ_f3/Wb	0.020 8
电机极对数n_p	4
直流母线电压U_dc/V	200
转动惯量J/(kg·m²)	0.001 2

三次谐波电流	转矩脉动(%)	转速脉动(%)
注入前	14.06	9.26
注入后	1.68	0.32

三次谐波电流	转矩脉动(%)	转速脉动(%)
注入前	58.2	35.3
注入后	27.0	16.2

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