YCT series adjustable-speed induction motors by electromagnetic clutch are composed of driving motors, electromagnetic slip coupling and controller. YCT series motors are usually used under a constant torque load and are particularly suitable for the use under the load with a decreasing torque such as the centrifugal pump and fan. Main applications of the YCT series motors include assembly lines, transfer equipments, plastic injecting machines, printing machines, pumps, fans, wire calendars, drawing machines etc. The speed of the YCT series motors can be adjusted continuously and steplessly within the specified adjustable speed range with an output of rated torque. When the loading torque is changed during the running of the motor, the exciting current of the coupling can be regulated automatically by the feedback system of the controller rapidly to ramain the speed unchanged.