摘要
永磁同步电动机的弱磁控制是通过增加定子直轴负向电流,利用直轴电枢反应使电机气隙磁场减弱,达到等效于减弱合成磁场的效果以实现弱磁增速的目的,这就造成弱磁运行时,转速越高对应的直轴负向电流越大,即电枢反应越严重。直轴电枢反应严重影响着直轴同步电感,同时交轴电流也在一个较大的范围内变化,交轴电流的变化也影响着交轴同步电感和永磁体产生的磁链。当电机参数在运行过程中发生较大变化时,便造成了转矩给定值和实际系统的转矩输出能力之间存在一定的偏差,使得系统无法跟踪指令值,导致整个系统性能下降。当电机参数发生变化时,为了提高系统的控制性能,本文提出了转矩模糊控制器,从而使给定转矩较好的跟踪电机实际转矩输出能力。
In order to enhance the performance of PMSM, the flux-weakening control method has been studied. The method of realizing PMSM DTC flux-weakening control is to increase negative direct axis current. The realizing method causes two problems, the first is that the parameters of PMSM vary in large-scale, the second is that the efficiency of PMSM reduces rapidly during flux-weakening control. Based on the realization of PMSM DTC flux-weakening control system, the parameters variation effect on flux-weakening performance was analyzed. Put forward a new fuzzy torque controller, which makes the torque command near to PMSM real ability.
出处
《微电机》
北大核心
2008年第4期28-31,共4页
Micromotors
关键词
永磁同步电动机
弱磁控制
参数变化
转矩模糊控制器
Permanent magnet synchronous motor
Flux-weakening Control
Parameters variation
Fuzzy torque controller
