基于PMSM模型解耦的电流控制器设计与性能研究

永磁同步电动机(PMSM)是一个多变量、非线性、强耦合的控制对象,即使在同步坐标系下对电机的磁场电流和转矩电流进行解耦,也无法实现d轴、q轴电压直接控制d轴、q轴电流.提出了电机本体解耦方案,即通过在电机中添加控制模块,把速度电压和互感项去掉,将交、直轴分量的控制转化成两个独立通道的控制系统;其次,设计了一种电流控制器,并将其应用于PMSM的电流控制中.仿真结果表明,该电流控制器具有较好的鲁棒性和动态响应性能.

Study of Current Controller Performance and Design Based on PMSM Model Decoupling

The permanent magnet synchronous motor (PMSM) is a controlled object featured with multi-variables,nonlinearity and strong coupling.The fact that d-axis current can be directly controlled by d-axis voltage,the same as the q-axis current,can not be realized even if the field current and torque current have been decoupled in the synchronous coordinates.A decoupling method for the electrical model was presented,meaning that the speed voltage and mutual inductance voltage were subtracted in the machine model proposed.Therefore,the control of d and q axis components was changed to single-loop independent control system.Then a current controller was designed and applied to the current control of PMSM.Simulation results show that it is of high performance of dynamic and robustness.