Analysis of the main causes of motor shaft vibration
motor shaftCause of vibration:
1.Electromagnetic2.Machinery;3.Electromechanical hybrid power.
Their specifics are described below.
Electromagnetic aspects:
Power supply: three-phase voltage (unbalanced, three-phase motor without phase operation)
Stator: the iron core becomes oval, eccentric, loose, winding disconnection, grounding breakdown, inter-turn short circuit, wiring error, three-phase current imbalance.
Rotor failure: the iron core becomes oval, eccentric, loose, and the rotor short-circuit ring and cage bar are welded and damaged. The three-phase winding level of the wound rotor is unbalanced, the winding is damaged, the ground breakdown, the inter-turn breakdown, the wiring is wrong, and the brush contact is poor.
Mechanical aspects:
motor shaftItself: the rotor is unbalanced, the shaft is bent, the slip ring is deformed, the fixed rotor air gap is uneven and the magnetic core is inconsistent. Bearing failure: poor foundation installation. Insufficient mechanical strength. Resonance, loose fixing screws and motor fan damage. When the bearing is close to the service life operation,motor shaftThe vibration of the bearing will gradually increase, and the operation of the bearing will produce noise. Grinding of the shaft and cover may occur.
Coupling fit: The coupling is damaged, the connection is poor, center loading is not allowed, and the mechanical imbalance system produces resonance.
Electromechanical Mixing:
motor shaftThe vibration is usually caused by an uneven air gap. The uneven air gap will cause unidirectional electromagnetic tension, which will increase the air gap. Therefore, the electromechanical mixing effect is manifested as electromechanical vibration.
Axial motor crosstalk, the electromagnetic force caused by the rotor's own gravity or mounting height and the incorrect magnetic core will cause the motor axial crosstalk, which will cause increased motor vibration and severe bearing wear, which will cause the bearing bushing temperature to rise rise rapidly.
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Motor shaft, armature shaft, precision shaft
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2024-01-02
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