基于梯形波相电流驱动的六相交流感应电动机性能

摘要

To realize the function that the field and torque can be controlled directly, a novel direct field and direct torque control strategy used in six-phase induction motor with special phase current waveform is proposed and evaluated. Firstly, the electromagnetic torque is calculated by theoretical and finite element analysis. Secondly, the analysical results are verified by practical experiment. The dominant merit of the proposed control strategy is that the flux and torque of the induction motor are directly controlled as compared to vector control that uses Park transformation theory. Another merit is that with stator winding layout, a nearly square, smooth rotating flux density in the air gap is generated by using the resultant field currents and the electromagnetic torque can be improved greatly.%为了实现六相感应电动机的励磁磁场和电磁转矩直接控制,提出了梯形波相电流来驱动六相交流感应电动机,并对其性能进行研究.首先采用理论分析和有限元分析对气隙磁场和电动机的电磁转矩进行了计算.其次,利用所构建的六相电动机的实验装置对理论分析结果进行了佐证.该六相电动机控制策略的最大优点是可以实现励磁磁场和转矩电流的直接控制而不需要派克变换,另一个优点是通过六相定子分布,合成的磁场电流可以产生一个近似的方波气隙磁场,使电磁转矩的输出得到极大的提高.