The Transactions of the Korean Institute of Power Electronics (전력전자학회논문지)

The Korean Institute of Power Electronics (전력전자학회)
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Torque Ripple Reduction Method With Enhanced Efficiency of Multi-phase BLDC Motor Drive Systems Under Open Fault Conditions

다상 BLDC 모터 드라이브 시스템의 개방 고장 시 효율 향상이 고려된 토크 리플 저감 대책

  • Kim, Tae-Yun (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University) ;
  • Suh, Yong-Sug (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University) ;
  • Park, Hyeon-Cheol (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)
  • Received : 2021.10.07
  • Accepted : 2021.11.02
  • Published : 2022.02.20
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Abstract

A multi-phase brushless direct current (BLDC) motor is widely used in large-capacity electric propulsion systems such as submarines and electric ships. In particular, in the field of military submarines, the polyphaser motor must suppress torque ripple in various failure situations to reduce noise and ensure stable operation for a long time. In this paper, we propose a polyphaser current control method that can improve efficiency and reduce torque ripple by minimizing the increase in stator winding loss at maximum output torque by controlling the phase angle and amplitude of the steady-state current during open circuit failure of the stator winding. The proposed control method controls the magnitude and phase angle of the healthy phase current, excluding the faulty phase, to compensate for the torque ripple that occurs in the case of a phase open failure of the motor. The magnitude and phase angle of the controlled steady-state current are calculated for each phase so that copper loss increase is minimized. The proposed control method was verified using hardware-in-the-loop simulation (HILS) of a 12-phase BLDC motor. HILS verification confirmed that the increase in the loss of the stator winding and the magnitude of the torque ripple decreased compared with the open phase fault of the motor.

Keywords

Acknowledgement

이 논문은 한국연구재단(NRF)의 연구비 지원을 받아 작성되었습니다. (No. 2020R1A2C2101519) 이 연구는 한국전력공사의 지원을 받았습니다. (Grant number: R21XO01-6)

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