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| Analysis on Zero Voltage Vector in Two-Phase Conduction Direct Torque Control of Brushless DC Motor |
| Yang Jianfei1,2, Cao Wei1, Li Decai1, Qiu Xin1,2, Liu Xun1 |
1. School of NARI Electric and Automation Nanjing Normal University Nanjing 210046 China;
2. Nanjing Institute of Intelligent High-End Equipment Industry Co. Ltd Nanjing 210042 China |
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Abstract The realization of the direct torque control method of the brushless DC motor is finally implemented to the selection and transmission of the voltage vector, and the correct definition and proper usage of zero voltage vector has a crucial influence on the performance of the motor. In this paper, the definition method of the zero-voltage vector of two-phase conduction brushless DC motor direct torque control method was analyzed in detail under non-sinusoidal back EMF and the turn-off phase. The variation law of motor current, terminal voltage and torque under different zero voltage vectors are analyzed in this paper, which shows that improper selection of zero voltage vectors will cause the turn-off phase fly-wheel diode to conduct, and results in negative torque in the turn-off phase, affecting the performance of the motor. An improved control method based on zero voltage vectors was proposed. According to the proposed new voltage vector selection table, the conduction of the turn-off phase can be effectively avoided by reasonable selection of the zero voltage vectors, which helps to improve the motor control performance. The experimental results verified the correctness of the theoretical analysis and the effectiveness of the proposed control method.
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Received: 13 September 2018
Published: 11 December 2019
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2019, Vol. 34 
