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Judge the open or short circuit of the washing machine motor winding

The washing machine motor generally uses a single-phase capacitor motor. The motor is mainly composed of a stator, a rotor, a main (secondary) winding and an end cover. When inspecting the motor, open the rear cover and detach the motor leads. The specific inspection method is as follows.

Inspection method of motor winding short circuit: Because the washing motor requires forward rotation and reverse rotation to drive the pulsator's periodic operation, the parameters of the main and auxiliary windings are designed to be the same. Use a multimeter ohm range (R × 10 ohm or R × 1 ohm range) to measure the resistance between the open end and the other two leads. If the measured values are basically the same (generally tens of ohms), the motor is normal. If the measured values differ greatly, the winding with the smaller resistance value has a short circuit. The parameters of the main and auxiliary windings of the dehydration motor are different, and the resistance value is measured with a multimeter ohm range (R × 10 ohm).

If the main winding resistance is 65-95 ohms and the secondary winding is 110-200 ohms (the secondary winding is about 50% larger than the main winding resistance), it means that the motor is normal. If it is less than the above resistance value, it means that the motor has a short circuit . Use a multimeter ohm scale (R × 10kohm) to measure the resistance between any lead and the end cap or the iron core. If the pointer swings, it means that the winding is not well insulated and there is a short circuit between the end cap and the end cap.

Motor winding open circuit inspection method: use a multimeter to measure the ohms. When there is no conduction between any two leads, the motor winding is open circuit. When an open circuit or short circuit occurs, the winding should be re-wound or the motor replaced.