Yaskawa Servo Motor Service

Every Yaskawa Servo Motor that comes to our facility goes through an extensive evaluation to find the problem with your servo motor and also to make sure we will be able to bring your old, broken down Yaskawa Servo Motor back to life as if the factory just sold you a new one.

A typical Yaskawa servo motor when it arrives it the shop, and then after we service it.




A Yaskawa surge readout before and after repair.




Oscilloscope printout of the BEMF (back electromotive force) from a Yaskawa servo motor with bad magnets, and readout after remagnetization, with proper BEMF.




Name plating is restored on all work down with trackable job numbers and original data.

In order to properly repair your Yaskawa 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. Without this information, a motor can only be repaired to "running" condition. Using this information allows us to insure your motor will perform to its factory specifications in your machine.

Our goal is to give you a Yaskawa Servo Motor that is not only repaired but has been refurbished back to like new condition. Our repair prodcedure often follows these steps:

1. Evaluation

Servotech inspects all electrical and mechanical parts on all Yaskawa Servo Motors. During our evaluation, we check and look for:

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 Yaskawa 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 Yaskawa 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.
• after the backing 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, Yaskawa motors are reassembled. Our assembly process often improves the internal motor components. Our assembled motors utilize:

• high-grade sealed bearings - we feel that each Yaskawa 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 Yaskawa 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 Yaskawa Servo Motor Repair process is to run your motor on a Yaskawa 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 Yaskawa 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 Yaskawa 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 Yaskawa Servomotor Repair was done.