说明：  变压调速是交流电机调速方法中比较简便的一种。由电力拖动原 理可知,当交流电机等效电路的参数不变时,在相同的转速下,电磁转 矩与定子电压的平方成正比,因此,改变定子外加电压就可以改变机械 特性的函数关系,从而改变电机在一定负载转矩下的转速。
(Variable voltage speed regulation is a relatively simple method of AC motor speed regulation. It can be seen from the principle of electric drive that when the parameters of the equivalent circuit of the AC motor remain unchanged, at the same speed, the electromagnetic torque is proportional to the square of the stator voltage. Therefore, changing the stator applied voltage can change the functional relationship of the mechanical characteristics , Thereby changing the speed of the motor under a certain load torque.)