Servo Motor Repair Procedures
Your Motor - Like New
Every Servo Motor that goes through our facility goes through an extensive evaluation to not only find the problem with the motor but also to make sure we will be able to bring your old, broken down Servo Motor back to life as if the factory just sold you a new one.
A typical Fanuc servo motor when it arrives it the shop, and then after we service it.
Oscilloscope printout of the BEMF (back electromotive force) from a Fanuc servo motor with bad magnets, and readout after remagnetization, with proper BEMF.
A Fanuc brush rigging repair before and after a complete rebuild with new brush holders and lead wires.
From here we evaluate it and look for any dynamic or static parts that do not meet factory specifications. In order to properly repair your Servomotor we need to have a good working relationship with the factory and original technical data sheets to obtain the finite specifications for the servomotor. This makes the difference between whether your Servomotor runs okay or whether it runs as if it is new from the factory once your Servomotor has been refurbished by Servotech.
Our goal is to give you a Servo Motor that is not only repaired but has been refurbished back to as new condition. Our repair procedure often follows these steps:
1. Evaluation
Servotech inspects all electrical and mechanical parts on your Servo Motor. During our evaluation, we check and look for:
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2. Repair
We manufacture or repair any problems found during our evaluation, fixing any part that does not meet the factory specifications. Often we:
- remagnetize rotor magnets.
- remanufacture a new Servo Motor front flange using the old flange and factory dimensions.
- repair all the windings. Both AC and DC Servomotors windings are washed, baked and tested.
- repair or replace brush holders and Bake-O-Lite insulation tubes on DC motors.
3. Preliminary Testing
Throughout the assembly process each Servomotor Repair will be meggered numerous times. Some of our tests include:
- test to confirm there are no grounded electrical parts in the servomotor.
- all AC stators are surge tested to at least 1500 volts This ensures that the insulation and windings will withstand the loads put on the servo motor when running on a machine.
- 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 alignment.
4. Assembly
After repair and preliminary testing, motors are reassembled. Our assembly process often improves the internal motor components. Our assembled motors utilize:
- high-grade sealed bearings - we feel that each Servo Motor repair will have a longer life with sealed bearings, because the seals keep dirt and contamination from getting into the bearing races.
- double lip seals in the front flange - these seals keep coolant from getting to the bearing.
- all new seals, O-rings, gaskets and connectors - ensure that your Servo Motor is protected from liquid contamination.
- two part epoxy coating for an added protection - the same coating used on Navy submarines.
5. Final Testing
The final step in the Servo Motor Repair process is to run your motor on a drive just like the one in your machine. This allows us to make sure all the previous steps in our Servo Motor Repair process were done correctly. It also allows us to run the Servo Motor at full voltages and full currents of the motors capability. We are constantly buying new drives in order to stay up to date with the manufacturer's changes.
6. Name Plating
Before shipping, Servotech makes all new name plates for each of our Servomotor Repairs. We put all of the original data on the name plate, even contacting the manufacturer if necessary. We also put Servotech's name and job number on the tag for traceability along with date codes so you as the customer know exactly when your Servomotor Repair was done.