Implementation of a Current Harmonics Suppression Strategy for a Six-Phase Permanent Magnet Synchronous Motor

Yu-Ting Lin, Jonq-Chin Hwang (), Cheng-Ting Tsai and Cheng-Tsung Lin
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Yu-Ting Lin: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei City 106, Taiwan
Jonq-Chin Hwang: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei City 106, Taiwan
Cheng-Ting Tsai: Department of Electrical Engineering, National Taiwan University of Science and Technology, Taipei City 106, Taiwan
Cheng-Tsung Lin: Chroma ATE Inc., Taoyuan City 333, Taiwan

Energies, 2025, vol. 18, issue 3, 1-14

Abstract: This paper proposes a current harmonic suppression strategy that combines harmonic synchronous rotating frame (HSRF) current feedback control and back-electromotive force harmonic (BEMFH) feedforward compensation to suppress the fifth and seventh current harmonics of a six-phase permanent magnet synchronous motor (PMSM). The current harmonics of six-phase PMSMs vary with the current due to manufacturing imperfections and the inverter nonlinearity effect. Using fixed-parameter BEMFH feedforward compensation cannot completely eliminate current harmonics. This paper integrates a closed-loop harmonic current control strategy, using HSRF in the differential mode of the six-phase PMSM rotor rotating frame to effectively mitigate current harmonic variations caused by load changes. The controller adapts a Texas Instrument microcontroller featuring encoder interfaces, complementary pulse width modulation (PWM), and analog–digital converters (ADC) to simplify the board design. The rotor angle feedback is provided by a 12-pole resolver in conjunction with an Analog Device resolver-to-digital converter (RDC). The specifications of the six-phase PMSM are as follows: 12 poles, 1200 rpm, 200 A (rms), and 600 V DC bus. The total harmonic distortion (THD) of the phase current for harmonics below the 21st order was reduced from 31.71% to 4.84% under the test conditions of 1200 rpm rotor speed and 200 A peak phase current. Specifically, the fifth and seventh harmonics were reduced from 29.98% and 9.72% to 2.74% and 1.21%, respectively. These results validate the feasibility of the proposed current harmonic suppression strategy.

Keywords: current harmonics; six-phase PMSM; common mode and differential mode; back-EMF harmonic compensation; harmonic synchronous rotating frame (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2025
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