YCT series electromagnetic speed regulating asynchronous motors are the ac constant torque speed regulating motors adn the even stepless speed regulating can be obtained through the control of SCR. YCT series motors have the automatic regulating systems of speed negative feedback. they have the features of that the rate of their speed regulation is wide and the maximum can be up 10:1:that they are small in control power,easy in self-control,collective control and remote control;that they are good in the performance of starting,large in starting torque, smooth in starting,easy in use and maintenance.