I've checked and repaired the motor, and even swapped the phases, but it keeps turning in one direction and won't turn back. The three-phase voltage of the contactor is normal, and the motor winding resistance is normal (all three pairs of resistance are basically equal). What could be the problem? I would greatly appreciate any guidance from experts!
A: Is there an automatic phase sequence recognition device in the circuit to prevent the motor from reversing? Or try swapping two phases at the motor output.
B: Does anyone use a frequency converter? If so, changing the phase sequence requires modifying the output.
C: Any phenomenon that defies common sense must have an undiscovered problem. Therefore, it's not surprising.
D: My first thought was to use a frequency converter to drive it, so I changed the phase at the input of the frequency converter.
Reply to everyone: The problem has finally been identified; the belt had come loose. The motor connector has two shafts, each driven by a separate motor. There is only a very small gap between the pulleys on the two shafts. The motor drive end of one of the belts came loose, and the belt was stuck between the two pulleys.
Therefore, the motor on the side is actually always driving the shaft on this side, which creates the illusion that the motor is always in the same direction regardless of the phase commutation. The two motors share one contactor.
