Improved circuit of centrifugal switch for single-phase motor

Working principle of the circuit: 220 V is supplied by capacitor C for step-down, diode VD, VDz half-wave rectification, capacitor C2 filtering and voltage stabilizing tube ZD provide a working voltage of about 12 V
to the delay circuit . When the motor power is turned on, the voltage on C is zero, so the composite tubes VL and VT2 are cut off, the normally closed contact of the relay JK is connected, and the main and auxiliary windings of the motor are powered to start. The 12 V voltage charges C3 through R2. After about 6 seconds, the voltage on C rises to about 1.8lv', VT1 and VT2 are turned on, relay JK is energized, the normally closed contact jumps, the secondary winding power is cut off, and the main winding Running alone, the motor start is completed.