In the case of the loss of the nameplate, to know the number of three-phase asynchronous motor poles used, we can use the current of the multimeterμAFile to test and judge, the following and Senli motor Xiaobian simple understanding of how to use a multimeter to determine the number of poles of the asynchronous motor.

       First we need to remove itThree-phase asynchronous motorThe original power cord and star or triangle connection can then be used with a multimeterR×100ΩFiles, from6Among the motor leads, find the two leads of any phase winding. Then turn the range switch of the multimeter to the currentμAFile and replace the marker with a crocodile clamp after firmly clamping the two winding leads found above.

       Hand the motor pulley or shaft slowly and uniformly turn a circle, and carefully observe the number of times the multimeter pointer swings. Every time the multimeter pointer swings, it indicates that the current in this phase winding changes positively and negatively once, so that it can be determined how many pairs of poles the motor has.

       This method uses the remanent magnetic flux of the rotor of the three-phase asynchronous motor to cut the stator winding and induce a small induced electromotive force when the rotor rotates at a uniform speed, which generates a current and makes the multimeter pointer swing.

       If it is said that the asynchronous motor that has not been used for a long time is judged in the above way, then the multimeter pointer may not respond, because the remanence of the motor disappears, in this case, we only need to connect the power line according to the normal method, energizing the motor for a few minutes, and the stator winding of the motor gets remanence after the power is cut off. Then the number of poles can be determined by the above method.

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