Yaskawa servo motor - ten common faults and troubleshooting methods of servo motors

1. Motor encoder alarm

1. The cause of the failure

(1) Wrong wiring;

(2) electromagnetic interference;

(3) Encoder hardware damage caused by mechanical vibration;

(4) Pollution caused by the on-site environment;

2. Troubleshooting

(1) Check the wiring and eliminate errors;

(2) Check whether the shielding is in place, whether the wiring is reasonably solved, and add filters for improvement if necessary;

(3) Inspect the mechanical structure and improve it;

(4) Check whether the inside of the encoder is polluted or corroded (dust, oil, etc.). ), to strengthen protection;

3. Installation and wiring standards

(1) Use the original cable as much as possible;

(2) Separate the cable so that it is as far away from the polluted wiring as possible, especially the highly polluted wiring;

(3) Use the internal power supply as much as possible. If a switching power supply is used, use a filter to ensure that the power supply reaches a clean level;

(4) Always grounded at the common end;

(5) Keep the encoder shell insulated from the machine structure and connected to the cable shielding layer;

(6) If the encoder cannot be insulated, connect the cable shield to the ground (or special terminals) on the encoder housing and drive frame.

Second, the motor shaft is broken

1. The cause of the failure

(1) Unreasonable mechanical design leads to excessive radial load force;

(2) The load end is stuck or serious instantaneous overload;

(3) Do not center when assembling the motor and reducer.

2. Troubleshooting

(1) Check the maximum radial load that can be borne in the motor sample and improve the mechanical design;

(2) Check the operation of the load side, confirm the actual process requirements and make improvements;

(3) Check whether the load operation is stable, whether there is vibration, and improve the accuracy of mechanical assembly.

Third, the no-load current of the motor is unbalanced, and the three are quite different

1. The cause of the failure

(1) The head and tail of the winding are wrong;

(2) The power supply voltage is unbalanced;

(3) The winding has faults such as inter-turn short circuit and reverse coil connection.

2. Troubleshooting

(1) inspection and correction;

(2) Measure the power supply voltage and try to eliminate the imbalance;

(3) Eliminate winding faults.

Fourth, the noise of the motor is abnormal when it is running

1. The cause of the 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.

2. Troubleshooting

(1) Replace the bearing or clean the bearing;

(2) Overhaul the rotor core;

(3) Refueling;

(4) Check and adjust the power supply voltage

5. It is difficult to start the motor, and when the rated load is loaded, the speed of the motor is lower than the rated speed

1. The cause of the failure

(1) The power supply voltage is too low;

(2) Misconnection of the motor;

(3) Rotor welding or breakage;

(4) The local coil of the rotor is misconnected;

(3) When repairing the motor winding, the number of turns increases too much;

(5) Motor overload.

2. Troubleshooting

(1) Measure the power supply voltage and try to improve it;

(2) correction of connections;

(3) Check the weld and break point and repair it;

(4) Correct the misconnection when it is found;

(5) Restore the correct number of turns;

(6) Load shedding.

6. The motor cannot rotate after being energized, but there is no abnormal noise, peculiar smell or smoke?

1. The cause of the 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 adjustment of the overcurrent relay is too small;

(4) The wiring of the control equipment is incorrect.

2. Troubleshooting

(1) Check whether there are breakpoints in the power circuit switch, fuse and junction box, and repair;

(2) Check the fuse model, the reason for the fuse, and replace the new fuse;

(3) Adjust the setting value of the relay and motor;

(4) Correct the wiring.

7. The motor vibrates greatly during operation

1. The cause of the failure

(1) The clearance of the wear bearing is too large;

(2) uneven air gap;

(3) Rotor imbalance;

(4) Bending of the rotating shaft;

(5) Couplings (pulleys) with low coaxiality.

2. Troubleshooting

(1) Replace the bearing 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.

8. The motor does not rotate after being energized, and there is a buzzing sound

1. The cause of the failure

(1) There is an open circuit in the rotor winding (one-phase disconnection) or one-phase power loss of the power supply;

(2) The end of the winding lead wire is terminated incorrectly or the winding is reversed;

(3) The contact of the power supply circuit is loose and the contact resistance is large;

(4) The motor is overloaded or the rotor is stuck;

(5) The power supply voltage is too low;

(6) The assembly of the small motor is too tight or the grease in the bearing is too hard;

(7) The bearing is jammed.

2. Troubleshooting

(1) Repair breakpoints;

(2) Check the winding polarity; Judge whether the end of the winding is correct;

(3) Tighten the loose wiring screws, and use a multimeter to judge whether each joint is repaired by false connection;

(4) load shedding or finding and eliminating mechanical faults;

(5) Check whether the specified surface connection method is misconnected; Whether the power supply wire is too thin and whether the voltage drop is too large;

(6) restructuring to make it flexible; Replacement of qualified grease;

(7) Repair bearings.

9. Bearing overheating?

1. The cause of the failure

(1) Too much or too little slippery grease;

(2) Poor oil quality containing 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 the shaft is rubbed;

(5) The motor end cover or bearing cover is not installed;

(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. Troubleshooting

(1) Add grease (volume 1)/3-2/3 according to regulations);

(2) Replace the clean lubricating grease;

(3) If it is too loose, it can be repaired with adhesive, and the inner hole of the axle journal or end cover can be tightened 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.

10. The motor is overheated or even smoking?

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 hot dismantling method is used to improperly burn the iron core;

(4) The motor is overloaded or starts frequently;

(5) The motor lacks phase and runs in two phases;

(6) Rewinding after the winding is not impregnated;

(7) There is a lot of dirt on the surface of the motor, or the ventilation pipe 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 replace the thick power supply wire;

(3) Repair the iron core and eliminate the fault;

(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) Take cooling measures to clean the motor and increase the ambient temperature.

Yaskawa servo motor - ten common faults and troubleshooting methods of servo motors

Yaskawa servo motor - ten common faults and troubleshooting methods of servo motors

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