基于电流超前角弱磁控制的五桥臂逆变器驱动双三相永磁同步电机技术

A Lead Angle Flux-weaking Control Strategy Based on Five-leg Driven DTP-PMSM

五桥臂逆变器驱动双三相永磁同步电机(DTP-PMSM)可节约两个功率器件,也可作单相桥臂故障时的容错手段,但五桥臂逆变器驱动下电压利用率(VUF)降低,限制电机调速范围。为拓宽电机调速范围,对五桥臂驱动造成的电压、电流限制进行分析,基于新的电气约束情况,采用电流超前角弱磁控制进行弱磁升速。实验结果表明,电流超前角控制可以平滑进入弱磁I区,有效提升电机最高转速,证明了控制策略的有效性。

The utilization of a five-leg inverter to drive a dual three-phase permanent magnet synchronous motor(DTP-PMSM)can eliminate two power switches,thereby serving as a fault-tolerant mechanism in singe-phase fault conditions.However,the voltage utilization factor(VUF)reduces under this five-bridge inverter,ultimately limiting the motor’s speed range.To address this limitation,a analysis was conducted regarding the voltage and current constraints imposed by the five-bridge inverter.Subsequently,a current phase advancing based flux-weakening control was adopted to achieve the speed extension.The experimental results demonstrate this current phase advancing control facilitate a seamless transition into the flux-weakening I zone,significantly elevating the motor’s maximum speed,thereby validating the effectiveness of the proposed method.