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Popular science knowledge of household washing machine motor

Household washing machine motors are generally single-phase capacitor asynchronous motors with two sets of windings, namely the main 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 dewatering motor. The requirement is to be able to achieve positive and negative alternating operation. Therefore, it determines that the primary and secondary windings must be regardless of wire diameter, number of turns, and winding form It must be exactly the same, only in this way can the motor performance be exactly the same when running in both directions.

In single-phase motors, winding types such as washing motors are rare. At present, common types of single-phase motors of this type are washing machines, washing motors, and small household blowers (mostly made in Zhejiang Wenling and Shanghai). The windings of the washing machine's dewatering motor are common types, that is, the diameter, number of turns, and pitch (commonly known as the span) of the main and auxiliary windings are different. In almost all single-phase motor windings, the diameter of the main winding is larger than the diameter of the secondary winding, but the number of turns of the main winding is less than the number of turns of the secondary winding. In other words, 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 primary winding coil resistance is small, while the secondary winding coil resistance is large. After we understand this principle, it is easy to judge how to connect the three lead wires of the motor. I will provide you with a maintenance case-Case: A washing machine dehydration motor, the coils have been replaced, the three lead wires are the same color, and there is no nameplate on the outside of the motor core. When encountering such a motor, most people will find it very difficult, but don't be nervous, there is no problem that cannot be solved. We just need to take out the multimeter to make the correct measurement, and the problem is solved. If you are using a digital multimeter, you only need to measure the position of the gear switch modulation diode (this position can measure both on-off and resistance).

After the preparations are done, you can measure. We need to measure the resistance between each of the three lead wires of the motor. We first pull out two wires for measurement, and then use the notes to measure the resistance value (if you have a good memory, you can also keep it in your heart) , And then measure another unmeasured lead-out wire and the two wires just measured separately, the resistance value of each measurement must be remembered clearly. Then compare, the two wires with the highest resistance are undoubtedly the two tail ends of the primary and secondary windings. As long as the two tail ends of the primary and secondary windings are determined, the remaining wire is undoubtedly the common end of the primary and secondary windings.

What is the public end? The common end is to directly screw the two ends of the main and auxiliary windings together to connect the power neutral line (generally washing machines do not emphasize which line is connected to the neutral line and the live line when using a household outlet). Well, the two tail ends of the main and auxiliary windings are determined, and the common point is also determined. Will you still be stumped? The wiring method is as follows: the common end is connected to the neutral line of the power supply, the two tail ends of the main and auxiliary windings are connected to the capacitor, and then the lead with the smallest resistance is connected to the live line of the power supply. It cannot be removed when it is fixed at the common end, and the other test lead is connected to the other two wires respectively, and the one with the least resistance is connected to the power line).

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