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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Yu-Ting Lin & Jonq-Chin Hwang & Cheng-Ting Tsai & Cheng-Tsung Lin, 2025. "Implementation of a Current Harmonics Suppression Strategy for a Six-Phase Permanent Magnet Synchronous Motor," Energies, MDPI, vol. 18(3), pages 1-14, January.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:3:p:665-:d:1581013
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