Online correction method for phase current gain errors in permanent magnet synchronous motor sensorless control

Chun Wu; Weimin Sha; Chunqiao Zhu

Online correction method for phase current gain errors in permanent magnet synchronous motor sensorless control

Chun Wu

Weimin Sha

Chunqiao Zhu

Vol. 24, No. 11, pp. 1778-1790, Nov. 2024

10.1007/s43236-024-00850-0

Permanent magnet synchronous motor

Current sampling gain error

Sensorless control

Sliding mode observer

Zero-crossing detection

Abstract

An online correction method for phase current sampling gain errors utilizing the phase current zero-crossing principle is proposed in this paper to solve the problems of torque/speed pulsation and inaccurate position estimation in permanent magnet synchronous motor (PMSM) drives. First, a mathematical model considering three-phase current sampling errors was built and a variable-gain sliding mode observer (SMO) was designed. Second, the impacts of current gain errors on electromagnetic torque and position estimation were analyzed. When any one of the three-phase currents crosses zero, the amplitudes of the other two-phase currents are the same but the signs are opposite. Based on this principle, the current gain ratios of these two-phase currents can be calculated. Finally, comparing three sets of current gain ratios, the faulty phase can be determined, and online correction of the current gain error is executed. Experimental results show that the proposed method can determine faults regardless of whether there is a large or small gain error. In addition, the proposed method can balance the three-phase currents, improve the accuracy of position estimation, reduce torque pulsation, and enhance the speed control performance.

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Cite this article

[IEEE Style]

C. Wu, W. Sha, C. Zhu, "Online correction method for phase current gain errors in permanent magnet synchronous motor sensorless control," Journal of Power Electronics, vol. 24, no. 11, pp. 1778-1790, 2024. DOI: 10.1007/s43236-024-00850-0.

[ACM Style]

Chun Wu, Weimin Sha, and Chunqiao Zhu. 2024. Online correction method for phase current gain errors in permanent magnet synchronous motor sensorless control. Journal of Power Electronics, 24, 11, (2024), 1778-1790. DOI: 10.1007/s43236-024-00850-0.