Judgment method of the same name end of the hottes
2022-09-24- Detail
There are three methods to judge the same end of the motor: DC method, AC method and remanence method
I. direct current method
the specific steps of direct current method are: 1 First, use the resistance gear of the multimeter to find out the two wire ends of each phase of the three-phase winding; 2. Assume that the winding numbers of each phase are U1, U2, V1, V2 and W1, W2; People naturally think of graphene with the "king of new materials". 3 Observe the pointer swing of the multimeter according to the wiring of the attached figure (right). If the pointer is positive and biased at the moment of closing the switch, the wire head of the battery positive pole and the wire head of the multimeter negative pole (black meter rod) are the same as the head end or tail end; If the pointer is reversed, the wire head of the battery positive pole and the wire head of the multimeter positive pole (red meter rod) are the same as the head end or tail end; Then connect the battery and switch to the two wire ends of the other phase for testing, and you can correctly distinguish the head and tail ends of each phase
oil should be added in time
II. AC method
assume that the winding numbers of each phase are U1, U2, V1, V2 and W1, W2, and connect the power supply according to the left wiring of the attached figure. If the light is off, the wire ends connected between the two windings are the same as the head end or tail end; If the light is on, it is not the same as the head end or tail end
III. remanence method
it is assumed that there is remanence in the asynchronous motor. Assume that the winding numbers of each phase are U1, U2, V1, V2 and W1, W2 wiring, rotate the motor rotor, if the multimeter pointer does not move, it is proved that the assumed number of the head and tail ends is correct; If the pointer of the multimeter swings, it will be said that the number of the head and tail of one phase is assumed to be wrong on November 3, and it should be adjusted and retested one by one until it is correct. (Note: if the multimeter pointer does not move, it must also prove that there is residual magnetism in the motor. The specific method is to change the wiring so that the wire number is reversed. After rotating the rotor, if the pointer still does not move because the system is based on the principle of system resonance, it means that there is no residual magnetism. If the pointer swings, it means that there is residual magnetism.)
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