Project Description

Yaskawa Servo Motor Repair

Authorized Yaskawa Servo Motor Repair FacilityThrough years of experience, Servotech has built a solid relationship with the Yaskawa factory. Because of this, we have the necessary resources to repair your motor to its factory specifications.
Every Yaskawa servo motor that comes to our facility goes through an extensive evaluation process. This process allows us to diagnose all issues your motor may have, and refurbish it to like-new condition. Our repair procedure includes the following steps:

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1. Evaluation of Your Yaskawa Servo Motor

Servotech inspects all electrical and mechanical parts on all Yaskawa servo motors. During our evaluation, we check for:

  • Bearing fits
  • Housing fits
  • Worn output shafts
  • Corroded and/or broken flanges
Yaskawa servo motor: beforeYaskawa servo motor: after
A typical Yaskawa servo motor when it arrives it the shop, and then after we service it.

2. Motor Repair

We repair any problems found during our evaluation, fixing any part that does not meet the factory specifications. Often we:

  • Re-magnetize rotor magnets.
  • Re-manufacture 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.
Yaskawa servo motor before repairRepaired Yaskawa servo motor
A Yaskawa servo motor surge readout before and after repair.

3. Preliminary Testing

Throughout the assembly process each Yaskawa servomotor repair will be subjected to numerous tests. Some of these include:

  • Confirming there are no grounded electrical parts in the servomotor.
  • All Surge testing stators to at least 1500 volts.
  • Bar to bar testing DC armatures after a thorough wash and bake cycle.
  • Assessing and documenting the servo motor feedback alignment.

4. Servo Motor Assembly

After evaluation and sourcing of needed parts and services, all Yaskawa servo motors are prepared for reassembly. Our assembly process often improves the internal motor components. Our refurbished servo motors are improved with the following parts and service:

  • 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 – which 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.
Yaskawa servo motor oscilloscope: beforeYaskawa servo motor oscilloscope: after
Oscilloscope printout of the BEMF (back electromotive force) from a Yaskawa servo motor with bad magnets, and readout after re-magnetization, with proper BEMF.

5. Final Testing on Yaskawa Servo Factory Drives

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.