Chinese machine - feeder - servo motor fault analysis Daquan

1 、 motor encoder alarm
(1) cause of failure;
Wrong wiring;
Electromagnetic interference;
Mechanical hardware damage caused by mechanical vibration;
Pollution caused by site environment;
(2) troubleshooting
Check wiring and eliminate errors;
Check whether the screen is in place, check the wiring is reasonable and solve, if necessary, increase the filter to improve;
Check the mechanical structure and improve it;
Check whether the interior of the encoder is polluted, corroded (dust, oil pollution, etc.), and strengthen the protection;
(3) installation and wiring standards;
Use the original cable as much as possible;
Separating cables to keep them away from pollution wiring, especially for high pollution wiring;
Use internal power supply as often as possible. If a switch power supply is used, filter shall be used to ensure that the power reaches a clean level;
Always connect the public terminal to the ground;
The encoder housing is insulated from the machine structure and connected to the cable shield;
If you can not make the encoder insulation, can be connected to the cable shield grounding shell and the frame encoder driver (or special terminal).
2 、 motor broken shaft
(1) cause of failure;
The unreasonable mechanical design results in too much radial load;
The load end is jammed or serious instantaneous overload;
When the motor and reducer are assembled, they are not concentric;
(2) troubleshooting
Check the maximum radial load on the sample of the motor, and improve the mechanical design;
Check the operation of the load end, confirm the actual process requirements and improve them;
Check whether the operation of the load is stable, whether there is vibration or not, and improve the accuracy of mechanical assembly.
3, the motor no-load current imbalance, three-phase difference
(1) cause of failure;
Winding head end connection error;
Unbalanced power supply voltage;
Winding faults such as turn to turn short circuit and coil reverse connection.
(2) troubleshooting
Check and correct;
Measure the power supply voltage and try to eliminate the unbalance;
Eliminate winding faults.
4 、 when the motor is running, the noise is abnormal and the noise is abnormal
(1) cause of failure;
Bearing wear or sand in the oil and other foreign bodies;
Rotor core looseness;
Bearing lack of oil;
The power supply voltage is too high or unbalanced.
(2) troubleshooting
Replace bearings or clean bearings;
Overhaul rotor core;
Refueling;
Check and adjust the power supply voltage
5, motor starting difficult, rated load, motor speed is lower than the rated speed
(1) cause of failure;
Supply voltage is too low;
Surface connection motor is wrongly connected;
Rotor welding or breaking;
The rotor local coil is wrong and connected;
Increasing the number of turns in repairing motor windings;
Motor overload.
(2) troubleshooting
Measure the power supply voltage and try to improve it;
Correcting connection method;
Check welding seam and break point and repair;
Find out the wrong place and correct it;
Correct turn number;
The load reduction.
6, after the power, the motor can not rotate, but no noise, no smell and smoke
(1) cause of failure;
The power is not connected (at least two phases are not connected);
Fuse fusing (at least two phase fuse);
The overcurrent relay is too small;
Control equipment wiring error.
(2) troubleshooting
Check the power circuit switch, fuse, junction box whether there is a breakpoint, repair;
Check fuse model, fuse reason, replace new fuse;
Adjust the setting value of relay and match with motor;
Correct wiring.
7 、 the motor vibration in operation is larger
(1) cause of failure;
Due to wear, bearing clearance is too large;
The air gap is uneven;
Rotor imbalance;
Axis bending;
The coaxiality of the coupling (pulley) is too low.
(2) troubleshooting
Repair the bearings and replace them when necessary;
Adjust the air gap so as to make it even;
Correcting rotor dynamic balancing;
Straightening shaft;
Re correction to make it conform to the regulations.
8, after the power, the motor does not turn, there is buzzing
(1) cause of failure;
Rotor winding open circuit (one phase broken line) or power supply phase loss;
The winding lead line is connected with the end of the winding or the inner of the winding is reversed;
The contact of the power circuit is loose and the contact resistance is big;
Excessive motor load or rotor stuck;
Power voltage is too low;
The small motor assembly is too tight or grease in bearing is excellent;
The bearing is stuck.
2 、 troubleshooting
The check out point to repair;
Check the polarity of winding and judge whether the winding end is correct;
Fastening the loose connection screw, and using the universal meter to judge whether the joint is false and repaired;
Reduce load or find out and eliminate mechanical trouble,
Inspect whether the provisions of the surface connection misconnection; whether the power supply wire to make the pressure drop is too large to be corrected,
The reconfigure flexible replacement of qualified oil;
The repair of bearing.
9, bearing overheating?
(1) cause of failure;
Too much or too little grease;
Poor in oil and containing impurities;
Bearing and shaft neck or end cover improperly (loose or tight);
The inner hole of the bearing is eccentric and is rubbed with the shaft;
The end cover or bearing cover of motor is not flat;
The motor and load coupling without correction, or belt is too tight;
The bearing clearance is too large or too small;
The motor shaft bending.
(2) troubleshooting
Add grease (1/3-2/3 of the capacity) according to the regulations;