1. The motor cannot rotate after being energized, but there is no abnormal noise, no peculiar smell and smoke.
1. Cause of failure: (1) The power supply is not connected (at least two phases are not connected); (2) Fuse blowing (at least two-phase blowing); (3) The overcurrent relay is adjusted too small; (4) The wiring of the control equipment is incorrect.
2. Troubleshooting(1) Check whether there is a break point at the power circuit switch, fuse and junction box, and repair; (2) Check the fuse model, the cause of the fuse, and replace the fuse; (3) Adjust the setting value of the relay to cooperate with the motor; (4) Correct the wiring.
Second, the motor does not rotate after powering on, and there is a humming sound
l. Fault causes: (1) the rotor winding is open (one phase disconnection) or the power supply is one phase power loss; (2) the beginning and end of the winding lead wire is connected wrong or the winding is reversed; (3) the power circuit contact is loose, and the contact resistance is large; (4) the motor load is too large or the rotor is stuck; (5) the power supply voltage is too low; (6) the small motor is too tightly assembled or the grease in the bearing is too hard; (7) the bearing is stuck.
2. Troubleshooting: (1) Identify the breakpoint and fix it; (2) Check the winding polarity; Judge whether the end of the winding is correct; (3) Tighten the loose wiring screws, use a multimeter to judge whether the joints are falsely connected, and repair them; (4) load reduction or detection and elimination of mechanical faults, (5) check whether the specified surface connection method is misconnected; Whether the voltage drop is too large because the power supply wire is too thin, it is corrected, and (6) reassembled to make it flexible; Replacement of qualified grease; (7) Repair bearings.
3. It is difficult for the motor to start, and when the rated load is loaded, the motor speed is much lower than the rated speed
1. Cause of failure: (1) The power supply voltage is too low; (2) Misconnection of the motor by the face connection method; (3) The rotor is welded or broken; (4) The local coil of the rotor is misconnected or reversed; (3) Excessive increase in the number of turns when repairing the motor winding; (5) Motor overload.
2. Troubleshooting: (1) Measure the power supply voltage and try to improve; (2) correction of connections; (3) Check the open welding and broken points and repair them; (4) Detect the misconnection and correct it; (5) Restore the correct number of turns; (6) Load shedding.
Fourth, the no-load current of the motor is unbalanced, and the three-phase difference is large
1. Cause of failure: (1) The end of the winding is wrongly connected; (2) The power supply voltage is unbalanced; (3) There are faults such as inter-turn short circuit and reverse coil connection in the winding.
2. Troubleshooting: (1) Check and correct; (2) Measure the power supply voltage and try to eliminate the imbalance; (3) Eliminate winding faults.
5. The sound of the motor is abnormal and abnormal when it is running
Cause of failure: (1) Bearing wear or foreign matter such as sand particles in the oil; (2) The rotor core is loose; (3) Lack of oil in the bearing; (4) The power supply voltage is too high or unbalanced.
Troubleshooting: (1) Replace the bearing or clean the bearing; (2) Overhaul the rotor core; (3) Refueling; (4) Check and adjust the power supply voltage.
6. The motor vibrates greatly during operation
Cause of 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.
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. Cause of failure: (1) Too much or too little 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
Cause of 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;
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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