单斩电流滞环控制的双凸极永磁电机三相桥式功率变换器中的电流尾巴

双凸极永磁电机的功率控制器通常采用电流滞环斩波控制.文中基于12/8极转子斜槽式双凸极永磁电机,研究了单斩电流滞环控制的三相桥式功率控制电路;提出采用这种控制方案的三相桥式变换器,每相绕组在关断时段内,会出现两段电流尾巴,削弱电机出力,增加系统损耗.文中首先介绍了单斩电流滞环控制方案,给出基于这种控制方案的三相桥式功率变换器稳态工作原理分析,阐述了电流尾巴的产生机理,给出电流尾巴出现时刻及电流尾巴大小的解析式,指出其危害性,并讨论了三相绕组反电势对称性及霍尔位置调整的准确度对电流尾巴的影响,实验结果证明了文中研究及结论的正确性.

CURRENT TAIL IN SINGLE-CHOP HYSTERETIC-CURRENT CONTROLLED POWER INVERTER FOR DOUBLY SALIENT PERMANENT MOTOR

Hysteretic current PWM control is often used in doubly salient permanent magnet motor drive. For a 9kW, 12/8-pole flume rotor doubly salient permanent magnet motor, its three-phase full-bridge power controller is researched, with the single-chop control strategy. Theoretical analysis of working principles reveals that the phase that should have no current will appear current tails, which are positive winding currents for two time regions. The current tails will reduce torque output and affect overall efficiency. Single chop control strategy is first introduced, then the working principles for three-phase full-bridge power controller are analyzed, and the formulas for current tail are dedicated. The influences of symmetry of three phase winding EMFs and the accuracy of hall positions on current tails are given. Finally, some related experimental waveforms are given, which testifies the above analysis and the conclusion.