低转矩波动无刷直流电动机提前导通控制方法

A Phase Advanced Commutation Scheme with Low Torque Ripple for Brushless DC Motor

转矩波动限制了无刷直流电动机在高精度高稳定性系统中的应用,随着转速增加,电机存在转矩波动增大、输出转矩下降等问题。根据等效模型分析了提前换相过程中转矩波动情况,研究了一种提前导通PWM控制方法。该控制方式使换相时电流的交点提前至反电动势的交点处,提前角度可随电机运行状态变化而动态调整。给出了控制方法实施过程并建立MATLAB/Simulink仿真模型,验证了控制方法对抑制转矩波动和减小输出转矩效果较明显。

The torque ripple limits the application of brushless DC motors in high precision and stability system. Some problems come out,such as the increasing torque ripple and the descending output torque descending can be caused by high rotated speed. With the analysis of torque ripple in the process of advanced commutation according to the equivalent model,a simple advanced commutation PWM modulation scheme was proposed. This controlling scheme made the current point of intersection ahead to the BEMF＇s and leads the angle dynamically adjusted with the changing motor running state. A control method process was provided and the MATLAB/Simulink simulation module was built. The simulation results verified the effect of the controlling method that can suppress torque ripple and descending output torque.