Repair of Siemens servo motor spindle biting failure

Repair of Siemens servo motor spindle biting failureRoot cause analysisRepair of Siemens spindle motor jamming, encoder failure of Siemens spindle motor, inability to open Siemens servo motor brake, cracked magnetic steel of Siemens servo motor, bearing jamming of Siemens servo motor, lack of force of Siemens servo motor, short circuit of Siemens servo motor coil, and grounding fault of Siemens servo motor alarm.

Repair of Siemens servo motor spindle biting failureRoot cause analysis：

1. The spindle of Siemens servo motor is not cleaned properly, with many impurities and inconvenient switching.

2. The motor of the spindle is damaged, resulting in poor operation.

3. The reason for the inaccurate orientation of the spindle is that the sensor cable is damaged, which affects the operation of the spindle.

4. The mechanical part of the motor is faulty, which can be attributed to the motor itself, as well as the wear of the spindle and damage to the rotor.

Case analysis of servo motor spindle biting failure: One maintenance that left a deep impression on me during the motor spindle biting failure was to repair a Lenz servo motor on site in Shanghai. The motor's fault at that time was also spindle biting, and there was a problem with the connection between the motor and the spindle. The ratio between them was not 1:1. At that time, they were on site with another engineer and tried to change the mechanical part of the machine together. They found that it could not be changed. In a helpless situation, they installed an encoder externally and made the synchronous connection ratio between it and the spindle 1:1. After testing again, the spindle biting failure disappeared and the motor resumed normal operation.

Repair and solution methods for Siemens spindle servo motor faults：

1. Abnormal wear fault of pulse encoder:

When repairing a servo motor due to abnormal wear of the encoder, it is necessary to first check whether the servo motor repair system is stable, whether the circuit board current is stable, and whether the voltage of the feedback line of the speed detection unit has continuously decreased at certain points. If there is a decrease, it indicates that the pulse encoder is abnormal. At this time, the most effective repair method is to choose to replace the encoder.

2. Pulse encoder coupling fault:

In the case where the cross coupling of the pulse encoder is damaged and cannot be used, it will cause a significant difference between the shaft speed and the detected speed, which cannot be synchronized. At this time, the coupling can be replaced.

3. Malfunction of the speed generator:

Usually, it is common to encounter faults such as wear and jamming of the mechanical and electrical brushes during daily maintenance of the tachometer generator, so it is necessary to repair or replace the tachometer generator first. For maintenance, the electric brush of the speedometer can be polished with steel sandpaper, and the commutator can be cleaned and reassembled.

4. The spindle cannot move directionally or does not move properly

When the spindle cannot move directionally or does not move properly during the maintenance of Siemens servo motors, the first step is to check the settings of the directional control circuit board, adjust the directional board and spindle control printed circuit board, and also check whether the output waveform of the encoder is showing normal performance to determine if it is caused by coding problems.