In order to ensure the normal operation of the equipment, it is a very important task to judge the cause of the fault in time and carry out timely processing. Here we will talk about the analysis and troubleshooting of AC servo motor faults.
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.
Second, the motor does not turn after the power is turned on. 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 excessively small voltage drop, correct it, 6 reassemble to make it flexible; replace the qualified grease; 7 repair the bearing.
Third, the motor is difficult to start, when the rated load, the motor speed is lower than the rated speed. 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.
Fourth, the motor no-load current is unbalanced, and the three-phase phase difference is large. 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.
5. When the motor is running, the sound is not normal, there is abnormal noise. Cause 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 in operation. Cause 1 is due to excessive wear bearing clearance; 2 air gap is not uniform; 3 rotor is unbalanced; 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.
Seven, the bearing is overheated 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.
8. Motor overheating or even smoke failure 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, and the current is too large to make the winding heat; 3 When repairing and removing the winding, improper thermal disassembly is used to 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 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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