为了增强五相永磁同步电机(PMSM)驱动系统的可靠性,以永磁体磁通中含有3次谐波分量的五相凸极式PMSM为研究对象,在无故障数学模型的基础上,针对五相绕组缺两相故障情况,提出了相应的缺两相容错型直接转矩控制(PTC)策略。该策略通过构建五相电机缺两相后的α1β1空间电压矢量分布图,基于当前周期的基波磁链信息和基波转矩信息,挑选出下一周期逆变器输出的最优电压矢量。为了实现平滑转矩,基波转矩采用总转矩给定值前馈补偿的方式以抵消电机缺相后3次谐波磁链耦合至α1β1空间而产生的转矩脉动。最后通过试验验证了所提控制方案能够在互相电机缺两相故障情况下平稳运行,且能实现正常运行到容错运行的快速切换。

In order to improve the reliability of the five phase permanent magnet synchronous motor (PMSM) drive system, the five phase salient pole PMSM with the third order harmonic components in permanent magnet flux was studied. Based on fault free mathematical model, a fault tolerant direct torque control (DTC) strategy was proposed for two phase open circuit situation. The strategy constructed the α1β1 subspace voltage vector map of the five phase motor under two phase open fault, and selected the optimal voltage vector of the inverter output in the next cycle based on the fundamental subspace flux linkage information and torque information in the current cycle. In order to achieve smooth motor torque, the torque ripple caused by the third order harmonic flux linkage coupled to the α1β1 subspace was overcome by adding the torque feed forward compensation. The experiments showed that the proposed method could run smoothly under two phase open circuit and switch fast from normal to fault tolerant operation.

TM 351