Siemens Servo Motor Repair
Siemens servo motors received into Servotech, undergo a thorough evaluation to identify the cause of failure. The repair process will bring your broken Siemens servo motor back up to factory specifications just as if you bought a new one.
Proper repair of your Siemens servo motor requires a good rapport with the factory as well as original technical data with the correct specifications for the servo motor. Motors can only be repaired to “running” condition, unless this critical information is readily available. Our resources allow us to ensure that your motor will perform to its factory standards, in your machine.
Our goal is to give you a Siemens servo motor that has been refurbished back to like new condition. Our repair procedure follows these steps:
1. Evaluation of Your Siemens Servo Motor
Servotech inspects all electrical and mechanical parts. Siemens servo motors are unique in both aspects, our evaluation checks for:
- Bearing fits
- Housing fits
- Worn output shafts
- Corroded and/or broken flanges
- Defective hall sensors, and AC tachometer output
A typical Siemens when it arrives in the shop, and then after we service it.
2. Servo Motor Repair
We address any problems found during our evaluation by re-manufacture or repair, fixing any part that does not meet the factory specifications. Our process includes:
- Epoxy rotor with new magnets
- Re-magnetize rotor magnets.
- Re-band rotor with new banding material to protect magnets.
- Re-manufacture a new Siemens servo motor front flange using the old flange and factory dimensions.
- Repair all the windings. Both AC and DC servo motors windings are washed, baked and tested.
- Repair or replace brush holders and Bake-O-Lite insulation tubes on DC motors.
- Re-solder, replace, and repair work to feedback – hall sensors and encoders.
Rotor that was seized inside the motor with broken magnets. Compare to a rotor that has had new magnets epoxied onto it, been re-magnetized, and re-banded to ensure the magnets will stay in place on the rotor at high speeds.
3. Preliminary Testing
Throughout the assembly process each Siemens servo motor repair will be meggered numerous times. Some of our tests include:
- Test to confirm there are no grounded electrical parts in the servo motor (megger test).
- All AC stators are surge tested to at least 1500 volts.
- After the baking process DC servo motor armatures go through a bar to bar test. This test will show if there are any shorts or opens in the winding.
- Servo motor feedback alignment.
4. Motor Assembly
After repair and preliminary testing, Siemens motors are reassembled. Our assembly process often improves the internal motor components. Our assembled motors utilize:
- High-grade sealed bearings – we feel that each Siemens servo motor repair will have a longer life with sealed bearings, because the seals keep dirt and contamination from getting into the bearing races.
- Replacement connectors, with upgraded seals and mechanical integrity for a longer connector life and lower chance of contamination through the connectors.
- All new seals, O-rings, gaskets and connectors – ensure that your Siemens servo motor is protected from liquid contamination.
- Two-part epoxy coating for an added protection – the same coating used on Navy submarines.
Oscilloscope printouts of a Siemens servo motor with a Hall sensor and Tach assembly that arrived misaligned, but was repaired by Servotech.
5. Final Testing of Your Repaired Siemens Motor
Once the motor has been repaired and rebuilt, we run your motor on a Siemens drive just like the one in your machine. Final testing allows us to check all the previous steps in our Siemens servo motor repair process.
It also allows us to run the Siemens servo motor at full voltages and full currents of the motors capability. New drives are constantly bought in order to remain up to date with the manufacturer’s latest technologies.
Heidenhain ERN 1387 brand new from the factory used to replace servo motor encoders when the output looks like the below oscilloscope read out.
6. Servo Name Plating
Before shipping, Servotech makes all new name plates for each of our servomotor repairs. These new name plates include all the original data from the motor, as well as Servotech’s name, job number, and date codes. This gives customers traceability in regards to their servo motor repair.