Current Harmonics Suppression of Six-Phase Permanent-Magnet Synchronous Motor Drives Using Back-Electromotive Force Harmonics Compensation

Po-Sheng Huang, Cheng-Ting Tsai, Jonq-Chin Hwang (), Cheng-Tsung Lin and Yu-Ting Lin
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Po-Sheng Huang: 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
Jonq-Chin Hwang: 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
Yu-Ting Lin: Chroma ATE Inc., Taoyuan City 333, Taiwan

Energies, 2024, vol. 17, issue 24, 1-14

Abstract: This paper investigates a back-electromotive force (EMF) harmonic compensation strategy for six-phase permanent-magnet synchronous motors (PMSMs) to reduce current harmonics and improve system performance. Ideally, the back-EMF waveform should be perfectly sinusoidal. However, manufacturing imperfections such as suboptimal magnetic circuit design, uneven winding distribution, and mechanical eccentricity introduce low-order spatial harmonics, particularly the 5th, 7th, 11th, and 13th orders, which distort the back-EMF, increase current harmonics, complicate control, and reduce efficiency. To address these issues, this study proposes a compensation strategy utilizing common-mode and differential-mode current control. By injecting the 6th and 12th harmonics into the decoupled voltage commands along the d-axis and q-axis, the strategy significantly reduces current harmonic distortion. Experimental validation was conducted using a TMS320F28386D microcontroller, which controlled dual inverters via PWM signals and processed real-time current feedback. Rotor position feedback was provided by a resolver to ensure precise and responsive motor control. At a rotational speed of 900 rpm, with a peak phase current I m of 200 A and an IGBT switching frequency of 10 kHz, the phase- a current total harmonic distortion (THD) was reduced from 11.86% (without compensation) to 6.83% (with compensation). This study focused on mitigating harmonics below the 14th order. The experimental results demonstrate that the proposed back-EMF harmonic compensation strategy effectively minimizes current THD, highlighting its potential for improving the performance and efficiency of multi-phase motor systems.

Keywords: current harmonics; six-phase PMSM; common mode and differential mode; back-EMF harmonic compensation (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: 2024
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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