Three-phase AC servo motors are widely used, but after long-term operation, various faults will occur, and the cause of the fault will be judged in time, and corresponding treatment will be carried out, which is an important task to prevent the fault from expanding and ensure the normal operation of the equipment.
1. After the power is turned on, the motor can't rotate, but there is no abnormal noise, no smell or smoke.
1. Fault reason 1 power supply is not open (at least two phases are not open); 2 fuse is blown (at least two phases are blown); 3 overcurrent relay is adjusted too small; 4 control device wiring error.
2. Troubleshooting 1 Check the power circuit switch, whether there is a breakpoint at the fuse and junction box, repair; 2 check the fuse type, the cause of the fuse, replace the fuse; 3 adjust the relay setting value to match the motor; 4 correct the wiring.
Third, the motor does not turn after the power is turned on.
l. The cause of the fault 1 is that the rotor winding has an open circuit (one phase disconnection) or the power supply is out of phase; 2 the winding lead wire is connected to the wrong end or the winding is internally reversed; 3 the power circuit contact is loose, 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 small motor assembly is too tight or the grease inside the bearing is too hard; 7 bearing is stuck.
2. Troubleshoot 1 to find out the breakpoint to be repaired; 2 check the polarity of the winding; determine whether the end of the winding is correct; 3 tighten the loose wiring screw, use a multimeter to judge whether the joints are falsely connected, and repair; 4 load shedding or detect and eliminate Mechanical failure, 5 check whether the specified surface connection method is misconnected; whether the voltage drop is too large due to the excessive power supply wire, correct it, 6 reassemble to make it flexible; replace qualified oil
Grease; 7 repair bearings.
Fourth, the motor is difficult to start, when the rated load, the motor speed is lower than the rated speed
1. Fault cause 1 power supply voltage is too low; 2-side connected motor is misconnected; 3 rotor is open or broken; 4 rotor local coil is misconnected and reversed; 3 is too much to increase the motor winding; 5 motor overload.
2. Troubleshooting 1 measure the power supply voltage, try to improve; 2 correct the connection method; 3 check the open welding and breakpoints and repair; 4 find the misconnection, correct it; 5 restore the correct number of turns; 6 load shedding.
5. The motor no-load current is unbalanced, and the three-phase phase difference is large.
1. The cause of the fault is that the first end of the winding is connected incorrectly; 2 the power supply voltage is unbalanced; and the third winding has a fault such as a short circuit between turns and a reverse connection of the coil.
2. Troubleshooting 1 check and correct; 2 measure the power supply voltage, try to eliminate the imbalance; 3 eliminate the winding fault.
Eight, when the motor is running, the sound is not normal, there is abnormal noise
The cause of the failure is 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.
Nine, the motor vibration is large during operation
Fault cause 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 and 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.
Ten, bearing overheating
1. Cause of failure 1 too much or too little grease; 2 oil quality is not good with impurities; 3 bearing misaligned with the journal or end cap (too loose or too tight); 4 bearing inner hole eccentric, rubbing with the shaft; 5 motor The end cap or bearing cap is not flat; 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 the motor shaft is bent.
2. Trouble-shooting 1 Add grease according to the regulations (1/3-2/3 of volume); 2Replace clean lubricating grease; 3Repair with loose adhesive, over-tightening, grinding journal or end cap inner hole To make it suitable; 4 repair the bearing cover, eliminate the rubbing point; 5 reassemble; 6 recalibrate, adjust the belt tension; 7 replace the new bearing; 8 correct the motor shaft or replace the rotor.
11. The motor is overheated and even smokes.
Fault cause 1 The power supply voltage is too high; 2 The power supply voltage is too low, the motor is running with the rated load, the current is too large to make the winding heat; 3When the winding is repaired, the thermal disassembly method is improper, the iron core is burned; 4 The motor is overloaded or frequently started; 5 motor phase loss, two-phase operation; 6 rewinding is not enough for the winding dip coating; 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 to eliminate the fault; 4 load shedding; control the start according to the specified number of times; 5 resume three-phase operation; Use secondary dipping paint and vacuum dipping process; 7 clean the motor, improve the ambient temperature, and adopt cooling measures.
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