Wrong connection or reverse embedding of winding in the maintenance of three-phase asynchronous motor? Dalan Electric teaches you to solve this way
2024-03-19 13:07:05
In the maintenance of three-phase asynchronous motors, if the windings are connected incorrectly or reversely embedded, what problems will occur and how can we solve them? Today, the editor of Dalan Motor takes everyone to take a look.
1. Problems
If the winding is wrongly connected or reversed, it will cause motor vibration, noise, three-phase current imbalance, motor overheating, reduced speed, and even cause the motor to not rotate or the fuse melted.
Second, the processing method
There are generally two cases of wrong winding connection or reverse embedding: one is the external wiring error, and the other is one or several coils in a certain pole phase group of the winding are reversely embedded or the pole phase group is connected incorrectly. At this time, the following inspections and treatments can be performed:
(1) Disassemble the motor, take out the rotor, and connect one-phase winding to a 3-6 volt DC power supply (for star-wired windings, the two ends of the DC power supply must be connected to the neutral point and the outlet of a certain phase winding, respectively ;
(2) For delta-connected windings, the connection points of the three-phase windings must be disassembled), and move the compass along the inner circumference of the stator. If the windings are not connected incorrectly or not embedded reversely, when the compass passes through each pole phase group in turn, Alternating north and south; if the compass points in the same direction when passing the adjacent polar phase group, it means that the polar phase group is connected wrongly; if the compass passes through different positions of the same polar phase group, the alternating north and south directions change, indicating that the polar phase group There are individual coils embedded in reverse.
(3) At this time, the connecting line or bridge line of the winding fault can be corrected. If the direction of the compass is unclear, the voltage of the DC power supply should be appropriately increased, or the compass with a stronger magnet should be exchanged for inspection. According to this method, three-phase windings are tested separately.
----- Responsible Editor: Dalan Oil Pump Motor 02-Procurement Consultant
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