基于转矩观测的分时换相策略的无刷直流电机直接转矩控制

摘要

直接转矩控制(DTC)理论应用于无刷直流电机转矩波动抑制方面已有了一些研究成果,但与实际工程应用仍有一定的差距.其中一个原因是二二相导通方式无刷直流电机带来的关断相使其磁链的轨迹复杂,导致磁链观察和给定环节困难.结合最佳分时换相策略和DTC的优点,用分时换相策略代替磁链观察环节,同时将直接转矩中的转矩观察用于分时换相时刻的确定,设计出一种结构简单,实用性强的无刷直流电机控制系统.仿真试验结果表明,该系统在电机高速或低速运行时都能达到良好的转矩波动抑制效果.%There are still some differences from practical application of direct torque control(DTC) in brashless DC mptor( BLDCM) , although some research results have been obtain. One of the main reason is the upcoming phase make the flux linkage path hard to be observed and given. Combined the adwantages of DTC and optimum time-share commutation, a BLDCM control system with a simple structure and strong practicability was designed. Simulation result showed that the performance of inhibiting torque ripple is effective.