Vibration causes and typical cases
There are three main reasons for vibration: electromagnetic reasons; mechanical reasons; mechanical and electrical mixing reasons.
I. Electromagnetic reasons
1. Power supply: Three-phase voltage is unbalanced, and three-phase motor is out of phase.
2. Stator aspect: the stator core becomes elliptical, eccentric, loose; the stator winding breaks, grounds breakdown, turn-to-turn short circuit, wiring error, and the stator three-phase current is unbalanced.
For example: Before the boiler room fan motor was repaired, it was found that the stator core had red powder. It was suspected that the stator core was loose, but it was not in the standard overhaul project, so it was not processed. The motor screamed when the test was overhauled. Troubleshoot after replacing a stator.
3. Rotor failure: the rotor core becomes elliptical, eccentric, and loose. The rotor cage strip is welded to the end ring, the rotor cage strip is broken, the winding is wrong, and the brush is in poor contact.
For example: in the running of the toothless saw motor of the sleeper section, the stator current of the motor is oscillated back and forth, and the vibration of the motor is gradually increased. According to the phenomenon, the rotor bar of the motor has the possibility of opening and breaking. After the motor is disassembled, it is found that the rotor cage has 7 breaks. The two serious sides and the end rings have all been broken. If they are not found in time, the accident of burning the stator may occur.
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