双凸极电机非导通相电流尾巴的研究

Research on Current Tails of Non-conducting Winding in Doubly Salient Motor

文中基于采用单斩桥臂上管PWM调制方式的12/8极转子斜槽式双凸极电机,对每个导通区间内非导通相的电流尾巴进行了深入研究。给出非导通相工作特性的分析,阐述了非导通相电机尾巴的产生机理,给出电流尾巴出现时刻、消失时刻及电流尾巴大小的解析式,分析其对电机运行的影响,并讨论了输入电压变化、三相绕组反电势变化、负载变化及霍尔位置调整准确度等多种因素对电流尾巴的影响,从而揭示了电流尾巴的产生与单斩电流滞环控制机理及三相绕组瞬时变化之间的内在关系,及影响电流尾巴大小的诸多因素,并通过实验验证了文中分析及结论的正确性。

For a class of 12/8-pole skewed-rotor doubly salient motor, operation principles of its three-phase full-bridge power controller are first analyzed, with the single-chop control strategy. Then the theoretical analysis of non-conducting winding in each operation region is given, which reveals that the winding should have no current for each operation region appears current tail. The appearance instant, disappearance instant and expressions for current tails are deduced, and the influence of current tails on motor performance is illustrated. The influences of input voltage, winding back EMFs, and the load on the current tails are analyzed when the Hall sensor positions are adjusted accurately or inaccurately. Thus the inherent relationship among current tail, single-chop hysteresis current control and instantaneous variation of winding back EMF is given, also several factors that influence current tail are summarized, with the verification of some related experimental results. Finally, some conclusions are drawn.