矢量控制变频调速的做法是：将异步电动机在三相坐标系下的定子交流电流Ia、Ib、Ic、通过三相—二相变换，等效成两相静止坐标系下的交流电流Ia1Ib1，再通过按转子磁场定向旋转变换，等效成同步旋转坐标系下的直流电流Im1、It1(Im1相当于直流电动机的励磁电流；It1相当于与转矩成正比的电枢电流)，然后模仿直流电动机的控制方法，求得直流电动机的控制量，经过相应的坐标反变换，实现对异步电动机的控制。
The method of vector control variable frequency speed regulation is: the stator AC current IA, IB, IC of asynchronous motor in three-phase coordinate system is equivalent to the AC current ia1ib1 in two-phase static coordinate system through three-phase to two-phase transformation, and then equivalent to the DC current IM1 and it1 (IM1 is equivalent to the excitation current of DC motor) in synchronous rotation coordinate system through directional rotation transformation according to the rotor magnetic field; It 1 is equivalent to the armature current which is proportional to the torque), then the control quantity of DC motor is obtained by imitating the control method of DC motor, and the control of asynchronous motor is realized by corresponding coordinate inverse transformation.
矢量控制方法的提出具有划时代的意义。然而在实际应用中，由于转子磁链难以准确观测，系统特性受电动机参数的影响较大，且在等效直流电动机控制过程中所用矢量旋转变换较复杂，使得实际的控制效果难以达到理想分析的结果。
The vector control method has epoch-making significance. However, in practical application, because the rotor flux is difficult to observe accurately, the system characteristics are greatly affected by the motor parameters, and the vector rotation transformation used in the equivalent DC motor control process is more complex, making the actual control effect difficult to achieve the ideal analysis results.