Servo motor repair common faults and methods


1. Mechanical oscillation (acceleration / deceleration) […]

1. Mechanical oscillation (acceleration / deceleration)
Common causes of such failures are:
① pulse encoder failure. At this moment, check whether the voltage on the feedback terminal of the speed detection unit drops at a certain point, and if there is a drop indicating that the pulse encoder is not good, replace the encoder;
② pulse encoder cross-shaft may be damaged, resulting in the shaft speed and speed detected are not synchronized, replace the coupling;
③ speed generator failure. Repair, replace the tachometer. Repair practice, tachometer brush wear, jamming failure more, this time should be removed tachometer brush, sandpaper with a few polished, while cleaning the commutator dirt, servo motor and then re-installed.
2. abnormal mechanical movement fast (speed)
Such faults, should check the position control unit and speed control unit should also check: ① pulse encoder wiring is wrong; ② pulse encoder coupling is damaged; ③ check the speed of the generator terminal servo motor is connected And excitation signal line is wrong.
3. The spindle can not move in the direction or orientation is not in place
Such failures, should check the orientation control circuit to set the adjustment, check the orientation plate, spindle control PCB adjustment, but also check the position detector (encoder) output waveform is normal to determine the encoder is good or bad It should be noted that the normal recording of the encoder output waveform when the device is normal, in order to check the fault).
4. Axis feed vibration
Should check the motor coil, the mechanical feed screw connection with the motor, servo system, pulse encoder, coupling, tachometer.