感应电机在弱磁区的电流解耦控制研究

为了实现感应电机的宽范围调速,针对按转子磁场定向时,d,q轴电流的耦合效应,引入复平面矢量分析法,建立了感应电机的电压一电流矢量模型,分析了同步旋转PI控制器在解耦方面的不足,提出了评价耦合强度的频率函数.在复数传递函数的基础上,提出了一种电流矢量控制器,该控制器在确定系数后,无需电机参数,就可在宽调速范围内实现电流解耦控制.实验结果证明了该方法的有效性和正确性.

Research for Current Decoupling Control of Induction Motor in Field-weakening Region

In order to implement the speed regulation in a wide range,the complex vector analysis method was introduced aimed to the cross coupling of d,q axis current of induction motor based on rotor flux orientation.The voltage-current vector model was established.The lack of decoupling of synchronous frame PI controller was analyzed.A frequency function which is used to verdict stiffness of coupling was presented.A current vector controller was presented based on complex transfer function.Decoupling control of current in a wide speed range can be realized dispensing with motor parameters after the controller coefficients are determined.The validity of this method has been approved by experimental results.