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Method of judging the end of stator winding of motor
Generally, the winding head and end of the stator of the motor are all led to the outlet plate, and the symbols D1, D2 and D3 are used to represent the head end, and D4, D5 and D6 are used to represent the end. The six wire ends of the motor stator winding can be connected into a "Y" shape or a "△" shape according to the regulations on the nameplate. However, in actual work, it is often encountered that the marks of the three groups of stator windings of the motor are lost or the first and second ends are unknown. At this time, the following methods can be used to be sentenced.
1 with a small bulb and battery method
First judge the two wire ends of the same phase winding. Two dry batteries and a small bulb are connected in series, one end is connected to any wire lead out of the stator winding, and then the other end is contacted with the other five wire ends respectively. If the bulb lights up when contacting a certain outgoing wire end, it means that the two wire ends connected with the battery and the bulb belong to the same group. According to this method, find out the two in-phase wire ends of the other two integrated groups and mark them-first.
② Connect any two-phase winding and a small bulb in series to form a loop, connect one end of the third phase group in series with a battery, and touch the other line with the other pole of the battery. If the bulb lights up (according to the principle of transformer, the instantaneous induced potential of the series two-phase group is superimposed, so the bulb lights up), it indicates that the two-phase winding is connected in series at the beginning and end, that is the two wire ends connected with the bulb, one is the first end Dl of the first one, and the other is the end D5 of the second phase. If the bulb is not bright, it means that the instantaneous induced potential generated by the two-phase series windings is subtracted, and its magnitude is equal and the direction is opposite., So that the total induced potential is zero, so the bulb is not bright. This indicates that the two wire ends connected to the bulb are the first ends D1 and D2 of the two-phase winding respectively (or the end D4 and D5 can also be considered), and the first ends are marked.
③ Connect the one-phase winding at the identified first end to the third-phase unified group in series, then identify the first end of the third-phase winding according to the above method, and finally mark the first end of D1 ~ D6 for wiring.
In the above method, it should be noted that the rated voltage of the bulb should be matched with the battery voltage, otherwise the current will be too small, so that the bulb should be bright but not bright, resulting in misjudgment. Therefore, the wire ends of the two-phase series windings should be switched and tested again. If the bulb does not light up twice, the induced current is too small, appropriately increase the number of battery (increase voltage) or replace a smaller rated voltage bulb can be. By the same token, 220V or 36V AC power and incandescent lamps can be used instead of batteries and small bulbs. However, in order to prevent excessively high induced potential from burning the bulb and winding, the bulb and power supply should be switched into the winding, I .e. the original single-phase winding (series connection) should be connected to the incandescent lamp, and the original two-phase winding series connection bulb should be connected to the AC power supply. The discrimination method is the same as above, but special attention should be paid to safety. At the same time, attention should be paid to that the time, after switching on the winding coil winding time, in order to avoid overheating of the coil, affecting its insulation.
2 Using multimeter and battery method
① Replace the battery and small bulb with a multimeter to measure the two wire ends of each phase winding. The two wire ends with the lowest resistance value are the wire ends of one phase winding.
② Switch the multimeter selection switch to three DC current range (or DC voltage range is also acceptable), and the range can be smaller, so that the pointer deflection is obvious. Mark the two wires of any group of windings with the marks of the first end D1 and the end D4 and connect them to the multimeter, and specify that the first end D1 is connected to the "-" end of the multimeter and the end D4 is connected to the "+" end of the multimeter. Then connect one wire passed by the other phase to the negative electrode of the battery, and touch the positive electrode of the battery at the other end. At the same time, pay attention to the instantaneous deflection direction of the meter needle. If the meter needle is moving (rotating to the right), the wire end connected to the positive electrode of the battery is the first end, and the wire end connected to the negative electrode of the battery is the end. Mark D2 and D5 at the first end. If the pointer of the multimeter instantly reverses (turning to the left to measure the first end of the phase winding is exactly opposite to the above.
③ multimeter and winding wiring does not move, with the same method to identify the end of the third phase winding. The principle of this method is also the principle of electromagnetic induction using transformers. It should be noted that the deflection direction of the pointer of the multimeter at the moment when the battery is turned on should not be the deflection change of the pointer of the multimeter at the moment when the battery is disconnected from the winding.
3 the use of motor rotor remanence and multimeter method
① Use a multimeter to electrically block and distinguish the two wire ends of the same phase winding. The method is the same as before.
② connect the three-phase windings in parallel, measure the current or voltage at both ends of the parallel windings with the milliampere gear or low voltage gear of the multimeter, and rotate the rotor at the same time. if the pointer of the multimeter does not move, it indicates that the three heads (D1, D2, D3) of the stator windings are connected in parallel, and the three heads (D4, D5, D6) are connected in parallel. If the multimeter pointer rotates, it means that the first end phase is not combined with the end phase. At this time, each phase winding should be adjusted to one head one by one, and the needle condition should be observed until the multimeter pointer does not move, then the first end mark can be made.
This method is to use the residual magnetism in the rotor in the stator winding induced potential to determine the direction of the relationship, so the motor rotor must have residual magnetism, that is, must be running or through the electric motor.
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