“电机统一理论”在电机控制中的作用

直流电机在恒速时其电压方程为常系数的线性微分方程,在电机控制中能进行快速的转矩和磁通控制。而异步电机是一个多变量、强耦合、非线性的时变参数系统,很难直接通过外加信号准确控制电磁转矩。但若以转子磁通这一旋转的空间矢量为参考坐标,应用"电机统一理论",利用从静止坐标系到旋转坐标系之间的变换,则可以把定子电流中的励磁电流分量与转矩电流分量变成标量独立开来,进行分别控制。这样,通过坐标变换重建的电机模型就可等效为一台直流电机,从而可像直流电机那样进行快速的转矩和磁通控制,给电机控制系统带来新的契机。

The Function of "Electric Machine Unification Theory" in Electric Machine Controlling

The voltage equation of direct current machine is the constant coefficient linear differential equation when it is working in constant speed. And the fast torque and magnetic flux controlling can be carried through. But asynchronous machine is a multivariate close coupling non - linear time - variable parameter system. And it is difficult to control by rule and line through adding exterior signal directly. If the rotor magnetic flux which is a revolving space vector is used as reference frame, and the electric machine unification theory is applied to implement the transform from quiescence coordinate system to rotating coordinate system, the exciting current component and torque current component of the stator current can be turned into singlehanded scalar and be controlled apart. In this way, the reconstructed electric machine model from the coordinate transformation can be e-quivalent to a dc machine. And so it can put up fast torque and magnetic flux controlling and bring a new chance for the electric machine controlling system.