一种可容错的无刷直流电机驱动控制方法

针对反电势为梯形波的永磁无刷直流电机断路故障,提出了一种可容错的驱动控制方法,利用电流传感器对故障进行检测和定位,对发生的一相断路故障,通过在传统三相全桥驱动电路基础上增加一路半桥,并将电机星型连接点引出与之相连,实现故障状态下的容错驱动。在Simulink中建立正常运行模型和容错运行模型,对所提出的驱动方案进行验证和分析。最后,通过实验证明了该方案的可行性以及理论分析和仿真的正确性。

A Method of Open Circuit Fault Diagnosis and Fault-Tolerant Control of BLDCM

For the open circuit fault of back EMF trapezoidal waveform permanent magnet brushless direct current motor, a fault-tolerant control method using current sensor to measure the phase current in multiple sectors to determine the faulty phase is presented. First, to solve the open circuit problem, by adding a half-bridge to the common three-phase full bridge and connecting it to the junction point of Y connection phase winding, a novel control strategy only using two phases is proposed. Then, the simulation models of normal operating and fault-tolerant operating are established in Simulink, the results of which verifies the feasibility of the control strategy. Finally, the specific driver is designed, and the experiment results demonstrate the correctness of the control strategy.