Analysis of AC servo motor fault
Fourth, the motor no-load current is unbalanced, and the three-phase phase difference is large.
The cause of the fault: 1 winding the first end of the wrong connection; 2 the power supply voltage is unbalanced; 3 windings have short-circuit between the turns, the reverse connection of the coil and other faults.
Troubleshooting: 1 check and correct; 2 measure the power supply voltage, try to eliminate the imbalance; 3 eliminate the winding fault.
5. When the motor is running, the sound is not normal and there is abnormal noise.
The cause of the failure: 1 bearing wear or foreign matter such as sand in the oil; 2 rotor core loose; 3 bearing lack of oil; 4 power supply voltage is too high or unbalanced.
Troubleshooting: 1 replace the bearing or clean the bearing; 2 repair the rotor core; 3 refuel; 4 check and adjust the power supply voltage.
Sixth, the motor vibration is large during operation
The cause of the failure: 1 due to excessive wear bearing clearance; 2 air gap is not uniform; 3 rotor imbalance; 4 shaft bending; 5 coupling (pulley) coaxiality is too low.
Troubleshooting: 1 repair the bearing, replace if necessary; 2 adjust the air gap to make it uniform; 3 correct the rotor dynamic balance; 4 straighten the shaft; 5 recalibrate to make it meet the requirements.
Seven, bearing overheating
Causes of failure: 1 too much or too little grease; 2 oil is not good with impurities; 3 bearing improperly with the journal or end cap (too loose or too tight); 4 bearing inner hole eccentric, rubbing with the shaft; 5 The motor end cover or bearing cap is not flat; 6 the motor and load coupling is not corrected, or the belt is too tight; 7 the bearing clearance is too large or too small; 8 the motor shaft is bent.
Trouble-shooting: 1 add grease according to the regulations (1/3-2/3 of volume); 2 replace the clean lubricating grease; 3 loose the adhesive can be repaired, tighten the car, grind the journal or end cap Hole to make it fit; 4 repair bearing cap, eliminate rubbing point; 5 reassemble; 6 recalibrate, adjust belt tension; 7 replace new bearing; 8 correct motor shaft or replace rotor.
Eight, the motor is overheated and even smokes
Fault reason: 1 power supply voltage is too high; 2 power supply voltage is too low, the motor is running with rated load, the current is too large to make the winding heat; 3 when repairing and removing the winding, improper thermal disassembly, burn the iron core; 4 motor overload or frequent start 5 motor phase loss, two-phase operation; 6 rewinding is not enough for the winding immersion paint; 7 ambient temperature is high, the motor surface is more dirt, or the air duct is blocked;
Troubleshooting: 1 reduce the power supply voltage (such as adjusting the power supply transformer tap); 2 increase the power supply voltage or change the thick power supply wire; 3 repair the iron core, eliminate the fault; 4 load shedding; control the start according to the specified number of times; 5 resume three-phase operation; 6 using secondary dipping paint and vacuum dipping process; 7 cleaning the motor to improve the ambient temperature, using cooling measures.
