SOFT STARTER FOR SINGLE-PHASE MOTOR AND SINGLE-PHASE MOTOR HAVING SUCH STARTER

摘要

A soft starter for a single-phase motor is provided, wherein the single-phase motor includes a main winding, a start winding and a run capacitor, the main winding and the start winding are connected in series with each other and the run capacitor is connected across the main winding and the start winding connected in series, the soft starter comprises a reactor connected in series with the main winding, an AC contactor having a coil, the coil being connected in parallel with the start winding, when a rotation speed of the motor reaches a predetermined threshold, the AC contactor acts to bypass the reactor. The soft starter of the present invention is used to reduce the start current in the main winding, to increase the start torque and to shorten the start time during the motor's start. Moreover, the present invention also provides a single-phase motor having such soft starter.