AC single-phase electric motor speed governing and steadying circuit

The utility model discloses a speed regulation and stabilizing circuit for a single-phase AC motor. The speed regulation and stabilizing circuit comprises a control unit, a rotating speed display circuit, an operating information input circuit and a rotating speed feedback circuit, as well as a power phase sample circuit and a motor executive circuit; the phase signals can be collected by the power phase sample circuit from alternating current power, and then are transmitted to the control unit after being amplified, rectified and filtered; the control unit will output certain duty ratio signals after operation, and then the duty ratio signals are sent to the motor executive circuit so as to control the rotating speed of the motor; the phase signals collected from the alternating current power are delivered to the control unit for operation, and then certain duty ratio signals are output to control the switching of the controlled silicon; by such rotating speed control mode, the volume of the controller is sm