【摘要】 针对五相内置式永磁同步电机发生单相开路故障时转矩输出能力降低以及转矩脉动变大的问题，提出了基于永磁转矩脉动为零的开路容错矢量控制策略。首先，构建故障后的降阶解耦变换矩阵，建立同步坐标系下的电机模型。其次，根据故障前后磁动势不变的原则，建立基于降阶解耦变换的容错矢量控制策略，并推导出使转矩脉动为零的电流约束方程组；分析表明，使得转矩脉动严格为零的方程组无解；通过比较可知，永磁转矩脉动比磁阻转矩脉动大，因此选择使永磁转矩脉动为零的容错控制策略，并在此基础上求解使输出转矩平均值最大化的容错电流。最后，对所提控制策略进行仿真及实验验证，实验结果表明该方法能够改善电机剩余健康相电流的对称性，电流有效值的平均值下降22.21%,电机的转矩脉动下降53%,提升了故障状态下的转矩输出能力。更多还原

【Abstract】 To address the issues of reduced torque output capability and increased torque ripple when five-phase interior permanent magnet synchronous motor occurs single-phase open-circuit fault, a fault-tolerant vector control strategy based on zero permanent magnet torque ripple was proposed. Firstly, a reduced-order decoupling transformation matrix was constructed after the fault and establish the motor model in synchronous coordinate system. Secondly, based on the principle of constant magnetic motive force before and after the fault, a fault-tolerant vector control based on reduced-order decoupling transformation was established. Then, a set of current constraint equations with zero torque ripple was established. Analysis shows that the equations with strictly zero torque ripple have no solution. It can be concluded through comparison that permanent magnet torque ripple was relatively larger than reluctance torque ripple. Therefore, a fault-tolerant control strategy was chosen to minimize permanent magnet torque ripple. And based on this, the fault-tolerant current that maximizes the average output torque was solved. Finally, the proposed control strategy was validated through simulation and experiments. The results show that the method can improve the symmetry of the remaining healthy phase current, with 22.21% reduction in the average value of current RMS and 53% reduction in the torque ripple, and enhance the torque output capability under fault condition.更多还原