A Four-Step Commutation Fault-Tolerant Operation Method for Two-Phase Short-Circuit of BLDCM
Zhou Qixun1, 2, Wang Kun1, Liu Na1, Zhang Yufeng1
1. College of Electrical and Control Engineering Xi’an University of Science and Technology Xi’an 710054 China;; 2. The Key Laboratory of Embedded System and Service Computing Ministry of Education Tongji University Shanghai 200092 China
Abstract The short-circuit fault of the brushless DC motor during operation may cause secondary failure, which gives rise to the function loss of the motor control system. Aiming at the two-phase short-circuit in the windings of brushless DC motor, a four-step commutation fault-tolerant control strategy is proposed to ensure that the system continues to operate after the motor fault. The three-phase current is detected by the current detection element installed in the motor winding, and the difference between two consecutive detection values is used as the characteristic quantity for fault location. According to the positioning results, the inverter bridge power tube conduction sequence and on-time are changed to achieve fault-tolerant control of phase short-circuit motor, meanwhile achieve fault isolation. In order to solve the problem of large torque ripple in the fault-tolerant operation of motor, the H_PWM-L_ON modulation method is used to optimize the duty cycle at the commutation time, and the torque ripple is suppressed. The working mechanism and commutation process of two-phase short circuit fault-tolerant control strategy of motor are described in detail, the proposed four-step commutation fault-tolerant control strategy is simulated and tested, the experimental results show that the peak value of non-fault-phase current during fault-tolerant operation of motor is about 1.5 times of that during normal operation of motor, the peak value of the fault-phase current during fault-tolerant operation of motor is about 1.25 times of that during normal operation, the torque fluctuation increase 20% and the fluctuation of rotational speed is less than 5%.
Zhou Qixun,Wang Kun,Liu Na等. A Four-Step Commutation Fault-Tolerant Operation Method for Two-Phase Short-Circuit of BLDCM[J]. Transactions of China Electrotechnical Society, 2019, 34(7): 1413-1422.
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2019, Vol. 34 
