无刷直流电机直接转矩控制系统

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.

Direct Torque Control for Brushless DC Motor

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.