The most common fault handling method for three-phase asynchronous motors
Phase asynchronous motor is the most widely used electrical equipment. Its function is to convert electrical energy into mechanical energy. The electric energy consumed by the motor in the enterprise accounts for more than 60% of the energy consumption. The most used one is the squirrel cage asynchronous motor. Simple, easy to start, small in size, reliable and durable, easy to maintain and overhaul. Asynchronous motors have many faults and can be generally divided into electrical and mechanical parts. Electrical part faults include stator winding phase loss operation, stator winding end-to-end reverse connection, three-phase current unbalance, winding short circuit and grounding, winding overheating and rotor broken strip, open circuit, etc.; mechanical partial faults have rotor broom, vibration, bearing overheating, Damage, etc. In order to ensure the safe operation of the asynchronous motor, after the motor fails, it is necessary to quickly and accurately find out the cause of the fault so as to repair it as soon as possible.
Motor vibration and noise
When the motor is in normal operation, the fuselage should be stable, the sound should be low and uniform, and the vibration of the motor should be differentiated between the motor itself or the poor installation of the transmission device, or the mechanical load end, and then specific conditions. Exclude. The vibration caused by the motor itself is mostly caused by poor dynamic balance, poor bearing, bending of the shaft, uneven motor mounting foundation, loose fasteners, and the like. Vibration creates noise and creates additional loads. If the sound is not normal, there may be the following situations:
1. When a loud beep is issued, it indicates that the current is too large, which may be caused by overload or three-phase current imbalance. When the motor is running in single phase, the click sound will be larger.
2. When the beep sounds, it may be caused by damage to the bearing balls.
3. When uneven sound is emitted, it is often due to the sound of the rotor and the stator being rubbed, that is, the sound of the broom, and should be stopped immediately.
