无刷直流电机直接转矩控制系统

Direct Torque Control for Brushless DC Motor

针对无刷直流电机换相期间存在较大的转动脉动,将直接转矩控制方法用于无刷直流电机控制系统中,分析了直接转矩控制的原理,结合无刷直流电机自身的特点,提出了略去磁链观测环节的无刷直流电机直接转矩控制方案。该方案转矩环采用滞环控制,根据转矩环输出和磁极位置决定施加的电压空间矢量。仿真和试验结果均表明,该方法能够较好地抑制无刷直流电机的转矩波动,具有良好的转矩动态响应。

To reduce the torque ripple generated in commutation period of blushless DC motor（BLDCM）,the direct torque control（DTC） is used to control BLDCM.The direct torque control principle is analyzed,and a direct torque control scheme for BLDCM without observation of flux linkage is proposed according to the characteristics of BLDCM.In this scheme,a hysteresis-controlled torque loop is adopted,and the voltage space vectors are determined by torque loop output and position of magnetic poles.Simulation and experimental results indicate that the DTC method can sig-nificantly reduce the torque ripple of BLDCM and gain perfect dynamic performances.