Household washing winding machine motors are generally single-phase capacitor asynchronous motors, with two sets of windings, namely the primary winding (working winding) and the secondary winding (starting winding).
Let’s talk about the washing motor first. The working state of the washing motor is completely different from that of the dehydration motor. The requirement is that it must be able to achieve alternating positive and negative operation. Therefore, it determines that the main and secondary windings must be regardless of wire diameter, number of turns, and winding form. To be exactly the same, only in this way can the motor's working performance be exactly the same when running in both forward and reverse directions.
In single-phase motors, winding types such as washing motors are rare. Common single-phase motors of this type are washing motors for washing machines, small household blowers and so on.
The windings of the motors used for washing machine dehydration are the most common type, that is, the wire diameter, number of turns, and pitch of the primary and secondary windings are different.
In almost all single-phase motor windings, the diameter of the main winding is larger than that of the secondary winding, but the number of turns of the main winding is less than the number of turns of the secondary winding. That is to say, the diameter of the main winding is thick and the number of turns is small; while the diameter of the secondary winding is small and the number of turns is large. Therefore, the resistance of the main winding coil is small, and the resistance of the secondary winding coil is large.
Understand this principle, it is easy to judge how to wire the three lead wires of the motor.
I will provide you with a repair case:
A washing machine dehydration motor, the coil has been replaced, the three lead wires are all the same color, and there is no nameplate outside the motor core.
Generally people will find it very difficult to encounter such a motor, but don't be nervous, there is no problem that cannot be solved. Just take out the multimeter and make the correct measurement, and the problem will be solved.
If you are using a digital multimeter, you only need to measure the gear position with the gear switch modulation diode (the gear position can measure both on-off and resistance). After the preparatory work is finished, you can measure.
We need to measure the resistance between every two of the three lead wires of the motor. We first pull out two wires to measure, and then use the notes to measure the resistance value (if you have a good memory, you can also keep it in mind) , And then measure the other unmeasured lead wire and the two wires that have just been measured. The resistance value of each measurement must be clearly recorded. Then compare, the two wires with the largest resistance are undoubtedly the two tail ends of the primary and secondary windings. As long as the two tail ends of the main and auxiliary windings are judged, the remaining wire is undoubtedly the common end of the main and auxiliary windings.
What is the public end? The common end is to directly screw the two head ends of the main and auxiliary windings together to connect to the neutral line of the power supply (generally, the washing machine does not emphasize which one is connected to the neutral line and which is connected to the live line when using a household socket).
Well, the two tail ends of the primary and secondary windings are determined, and the common point is also determined. Will you be stumped?
The wiring method is: the common terminal is connected to the neutral line of the power supply, the two tail ends of the primary and secondary windings are connected to the capacitor, and then the lead with the smallest resistance is connected to the live wire of the power supply (a multimeter test lead should be connected to the common terminal, this test lead should always Fixed at the common end and cannot be removed, and the other test lead is connected to the other two wires respectively, and the one with the least resistance is connected to the live wire of the power supply).