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Description of eccentric fault of electromagnetic vibration caused by abnormal rotor conductor
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Electromagnetic vibration caused by abnormal rotor conductor:
Due to the poor machining and assembly of the rotor or broken rotor bars and other reasons, the eccentric position caused by this fault is not fixed to the stator but fixed to the rotor (opposite to the static air gap in static eccentricity). Therefore, the eccentric position moves synchronously with the rotation of the rotor. This eccentricity is called air gap dynamic eccentricity, as shown in Fig. 4-12 (a) As shown in Fig.
Electromagnetic
Dynamic eccentricity of air gap caused by shaft deflection or out of round rotor core
When the motor is running, the synchronous speed of the rotating magnetic field is f OLP, the rotor speed is (1-s) yuan IP, (s is the slip of asynchronous motor). Due to the existence of dynamic eccentricity and rotor imbalance, unbalanced electromagnetic force and unbalanced mechanical force are produced at the same time, and the mechanical vibration contributes to the unbalanced electromagnetic force.
For eccentric point a, the rotating magnetic field exceeds the speed of the rotor speed.
Therefore, the time-domain waveform of the electromagnetic force generated by it is a beat pulsation with half of the period at the frequency of F OLP, as shown in Fig. 4-12 (b).
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