Fault-Tolerant Control Strategy for Five-Phase PMSM With Third-Harmonic Current Injection

• Main Authors: Huang Qiu-Liang, Chen Yong, Xu Li
• Format: Article
• Language: English
• Published: IEEE 2018-01-01
• Series: IEEE Access
• Subjects: Fault tolerant control; five-phase permanent-magnet synchronous motor (FPPMSM); magnetic motive force (MMF); back electromotive force (EMF); transformation matrices; dynamic response
• Online Access: https://ieeexplore.ieee.org/document/8482112/

As the third-harmonic air-gap magnetic motive forces (MMFs) can be well utilized to improve the torque density, more and more research has been studying the postfault control for a five-phase permanent-magnet synchronous motor with trapezoidal back electromotive force (EMF). This paper presents a new reduced-order fault-tolerant control (FTC) scheme for the FPMSM with trapezoidal back EMF under single-phase open-circuit fault. Firstly, third reduced-order transformation matrices with third-harmonic current injection, the postfualt five-phase machines can not only realize an undisturbed MMF but also maintain high electromagnetic torque. Finally, the results verify that the proposed FTC strategy on reduced-order model can realize the single-phase open-circuit fault-tolerant and show fast dynamic response capability even under FTC condition.