6. The motor vibrates greatly during operation
(1) The cause of the failure
(1) Due to excessive clearance of worn bearings;
(2) uneven air gap;
(3) Rotor imbalance;
(4) Bending of the rotating shaft;
(5) The coaxial axis of the coupling (pulley) is too low.
(2) Troubleshooting
(1) Overhaul bearings and replace them if necessary;
(2) Adjust the air gap to make it uniform;
(3) Correct the dynamic balance of the rotor;
(4) Straighten the rotating shaft;
(5) Recalibrate to make it conform to the regulations.
7. The bearing is overheated
(1) The cause of the failure
(1) Too much or too little slippery grease;
(2) The oil quality is not good, and it contains impurities;
(3) The bearing is not properly matched with the journal or end cover (too loose or too tight);
(4) The inner bore of the bearing is eccentric and rubs with the shaft;
(5) The motor end cover or bearing cover is not flattened;
(6) The coupling between the motor and the load is not corrected, or the belt is too tight;
(7) The bearing clearance is too large or too small;
(8) Motor shaft bending.
(2) Troubleshooting
(1) Add grease (1/3-2/3 of the volume) according to the regulations;
(2) Replace the clean lubricating grease;
(3) If it is too loose, it can be repaired with binder, and if it is too tight, it should be turned and the inner hole of the journal or end cover should be ground to make it suitable;
(4) Repair the bearing cover and eliminate the friction point;
(5) reassembly;
(6) Re-calibrate and adjust the belt tension;
(7) Replace the new bearing;
(8) Correct the motor shaft or replace the rotor.
8. The motor is overheated or even smoked
(1) The cause of the failure
(1) The power supply voltage is too high;
(2) The power supply voltage is too low, the motor is running with rated load, and the current is too hot for the winding;
(3) When repairing and dismantling the winding, the thermal dismantling method is improper, which burns the iron core;
(4) The motor is overloaded or starts frequently;
(5) The motor lacks phase and runs in two phases;
(6) After rewinding, the winding impregnation paint is insufficient;
(7) The ambient temperature is high, and there is a lot of dirt on the surface of the motor, or the ventilation duct is blocked;
(2) Troubleshooting
(1) Reduce the power supply voltage (such as adjusting the tap of the power supply transformer);
(2) Increase the power supply voltage or change the thick power supply wire;
(3) Overhaul the iron core and eliminate faults;
(4) load shedding; Control the start according to the specified number of times;
(5) Restore three-phase operation;
(6) Adopt secondary dipping and vacuum dipping process;
(7) Clean the motor, improve the ambient temperature, and adopt cooling measures
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