Automatic control circuit of motor

The utility model relates to a control circuit of an asynchronous RC-Y-Delta motor, in particular to a motor control circuit for the starting, operating, stopping, compensation of power factors thereof, arc extinction protection and no damage of a contact circuit of a large-power three-phase asynchronous motor, consisting of a main loop and a control loop; on the method of the original star-shaped and triangular control circuit, a combined capacitor delta connection method and a combined resistor short-circuit method are added, and the control of all the whole process to the motor is realized by an alternating-current contactor, a time relay and the like. As the RC circuit is added, the control circuit has the compensation of power factors when the motor is started, eliminates the damage and hazard brought by a self-inductance electromotive force to a system circuit and a component when the motor is stopped, leads the circuit control system to be safe and the reliable and has the characteristics of long servi