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矢量控制是通过矢量坐标电路控制电动机定子电流的大小和相位，以达到对电动机在d、q、0坐标轴系中的励磁电流和转矩电流分别进行控制，进而达到控制电动机转矩的目的。通过控制各矢量的作用顺序和时间以及零矢量的作用时间，又可以形成各种PWM波，达到各种不同的控制目的。例如形成开关次数最少的PWM波以减少开关损耗。目前在变频器中实际应用的矢量控制方式主要有基于转差频率控制的矢量控制方式和无速度传感器的矢量控制方式两种。
基于转差频率的矢量控制方式与转差频率控制方式两者的定常特性一致，但是基于转差频率的矢量控制还要经过坐标变换对电动机定子电流的相位进行控制，使之满足一定的条件，以消除转矩电流过渡过程中的波动。因此，基于转差频率的矢量控制方式比转差频率控制方式在输出特性方面能得到很大的改善。但是，这种控制方式属于闭环控制方式，需要在电动机上安装速度传感器，因此，应用范围受到限制。
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