The winding connection error causes an incomplete rotating magnetic field, which causes difficulty in starting, three-phase current imbalance, and high noise. If it is not treated in time, the winding will be burned out. There are mainly the following cases: one or several coils in a pole phase are reversed or the head and tail are connected incorrectly; the pole (phase) group is reversed; one phase winding is reversed; the multiple parallel winding branches are connected incorrectly; "," "Y" is wrong.
1, the phenomenon of failure
The motor can't start, the no-load current is too large or the imbalance is too large, the temperature rises too fast or there is severe vibration and there is a lot of noise and the fuse is blown.
2, the cause
Misplace the "â–³" type into the "Y" type; the maintenance and maintenance of the three-phase winding has a phase end-to-end connection; the decompression start is the improper selection of the tap position or the internal wiring error; the new motor is in the offline, the winding connection is wrong; The motor is judged wrong.
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