一种新颖的无刷直流电机直接转矩控制方法研究

Study on A New Scheme for Brushless DC Motor DTC

针对无刷直流电机直接转矩控制(BLDCM DTC)中磁链观测困难、控制复杂等问题,提出了一种应用于无刷直流电机二二导通方式下的新型直接转矩控制方法:在电机基频以下调速时,略去了常规的磁链观测控制环节,改进了转矩计算方法,通过转矩滞环控制选择所施加的空间电压矢量。该方法简化了控制结构,降低了控制成本,实现了无刷直流电机的直接转矩控制运行。仿真和试验结果表明该方法可行有效。

A new brushless DC motor DTC scheme was studied to solve those problems associated with direct torque control （DTC） of brushless DC motor, such as difficulty to control flux and complexity to estimate torque. The flux hysteresis controller was ignored in the constant torque region and an improved method was proposed to make the estimation of torque easier. The proper stator voltage space vector was selected based on the output of the torque hysteresis controller and the sector which the current rotor flux locates in. The structure of the control system was simplified and the cost was reduced. Simulation and experimental results are presented, and it is shown that the feasibility and the validity of the scheme.