关键词: 无刷直流电机, 换相转矩抖动, 直接电流控制, 两相导通模式

Abstract: The conventional pulse width voltage modulation control method of brushless DC motor has large commutation torque ripple, which limits its application in high precision servo control systems. The relationship between non commutated current and output torque of brushless DC motor were analyzed in detail.With this current as control object,the method of direct current control with two-phase conduction control mode was proposed to achieve direct control of the current and suppress the torque ripple. And the proposed method and PWM voltage control method were comparatively analyzed on MATLAB software. The simulation and experiment results showed that the proposed method can effectively suppress the current and torque ripple of permanent magnet brushless DC motor and has better load response and steady state performance.

Key words: brushless DC motor (BLDCM), commutationtorque ripple, direct current control (DCC), two-phase conduction mode