Sensors prevent motor vibration risks
Motor vibration cause
1. Electromagnetic causes cause vibration
● Power supply: The three-phase voltage is unbalanced, and the three-phase motor is out of phase.
● 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.
● 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.
2. Motor mixing causes vibration
● Motor vibration is often caused by uneven air gap, causing single-sided electromagnetic pulling force, and the single-sided electromagnetic pulling force further increases the air gap. This electromechanical mixing acts as motor vibration.
●The axial movement of the motor is caused by the gravity of the rotor itself or the installation level and the magnetic center is not correct. The electromagnetic tension caused by the motor causes the axial movement of the motor to cause the motor vibration to increase. In severe cases, the shaft is ground and the temperature of the bearing is rapid. Raise.
3. Mechanical causes vibration
● Motor itself: rotor imbalance, shaft bending, slip ring deformation, stator and rotor air gap are uneven, stator and rotor magnetic center are inconsistent, bearing fault, poor foundation installation, mechanical mechanism strength is insufficient, resonance, ground screw loose, motor The fan is damaged.
● Coupling: Coupling damage, poor coupling connection, misalignment of the coupling, mechanical imbalance, system resonance, etc. The linkage part of the shaft system is misaligned, the center line does not coincide, and the centering is incorrect. The cause of this failure is mainly caused by poor alignment and improper installation during the installation process. There is also a case where some of the center lines of the interlocking parts are coincident in the cold state, but after a period of operation, the center line is broken due to the deformation of the rotor fulcrum and the foundation, thereby generating vibration.
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