Abstract：This paper mainly describes a direct torque control strategy of brushless DC motor to minimize torque ripple. In the traditional direct torque control system, brushless DC motor has large current and torque ripple, for one voltage vector applied in one cycle and its low inductance. This paper combines hysteresis torque control with PWM mode to control torque. In addition, when the direct torque control system operating in the two-phase half-bridge 120°conduction mode, large torque ripple in commutation appears every 120 electrical degree, thus on the basis of analyzing the root of torque ripple in detail, this paper puts forward the lookup table of switching devices states of new half-bridge modulation mode in the positive and negative reference torque. Finally, simulation by Matlab and experiment results from DSP are presented to verify the feasibility and effectiveness of the proposed strategy operating in four-quadrant operation.
李珍国, 章松发, 周生海, 张纯江. 考虑转矩脉动最小化的无刷直流电机直接转矩控制系统[J]. 电工技术学报, 2014, 29(1): 139-146.
Li Zhenguo, Zhang Songfa, Zhou Shenghai, Zhang Chunjiang. Direct Torque Control of Brushless DC Motor Considering Torque Ripple Minimization. Transactions of China Electrotechnical Society, 2014, 29(1): 139-146.
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2014, Vol. 29 
