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

김태윤; 서용석; 박현철

doi:10.6113/tkpe.2022.27.1.33

다상 BLDC 모터 드라이브 시스템의 개방 고장 시 효율 향상이 고려된 토크 리플 저감 대책
Torque Ripple Reduction Method With Enhanced Efficiency of Multi-phase BLDC Motor Drive Systems Under Open Fault Conditions 원문보기

전력전자학회 논문지 = The Transactions of the Korean Institute of Power Electronics, v.27 no.1, 2022년, pp.33 - 39

김태윤 (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University) , 서용석 (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University) , 박현철 (Dept. of Electrical Engineering, Smart Grid Research Center, Chonbuk National University)

Abstract ▼ AI-Helper

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.

주제어

표/그림 (16)

그림 Fig. 1. Overall circuit diagram of 12-phase BLDC motor drive system.
그림 Fig. 2. Current vector diagram of 12-phase BLDC motor.
그림 Fig. 3. a-phase voltage and current in steady state of BLDC motor.
그림 Fig. 4. Vector diagram of 2^nd order harmonic torque in 12-phase motor.
그림 Fig. 5. A control method for creating T_2wt-n-target vector.
그림 Fig. 6. 12-phase motor torque second harmonic component vector diagram with control strategy applied.
그림 Fig. 7. Torque 2^nd harmonic component vector diagram of 12-phase motor that has been controlled.
표 TABLE I CALCULATION RESULT VALUE OF θ_n-T AND K_n-T FOR EACH PHASE
표 TABLE II CALCULATION RESULT VALUE OF θ_n-I AND K_n-I FOR EACH PHASE
그림 Fig. 8. Torque and Current measurement waveform using 1 KHz filter.
그림 Fig. 9. Frequency spectrum of output torque.
그림 Fig. 10. Torque graph using 1 KHz filter in the HILS according to proposed method.
표 TABLE III OPERATION CONDITION OF BLDC MOTOR
그림 Fig. 11. Copper loss comparison graph according to control method.
표 TABLE IV COMPARISON OF RMS CURRENT AND COPPER LOSS IN EACH CASE
표 TABLE V COMPARISON OF TORQUE RIPPLE FACTOR AND ∑I2 IN EACH CASE

참고문헌 (14)

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상세보기
J. Moon, W. Lee, S. Park, and J. Kim, "Fault tolerant control method of seven-phase BLDC motor in asymmetric fault condition due to open phase," in International Conference On Power Electronics-Ecce Asia, pp. 1-5, 2015.
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상세보기
H. Qiu-Liang, C. Yong, and L. Xu, "Fault-tolerant control strategy for five-phase PMSM with third-harmonic current injection," IEEE ACCESS, Vol. 6, pp. 9, 2018.

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