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.

Here is how the typical Yaskawa Servo Motor comes into our facility before any evaluation has been done.               

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. This makes the difference between whether your Yaskawa Servomotor runs okay or whether it runs as if it is new from the factory once your Yaskawa Servomotor has been refurbished by Servotech.

Our goal is to give you a Yaskawa Servo Motor that is not only repaired but has been refurbished back to like new condition.

Here is how the typical Yaskawa Servo Motor leaves our facility.                 

This is an oscilloscope printout of USAFED Yaskawa Servo Motor of what we would expect to see on a good Servo Motors BEMF (back electromotive force).      

This is an oscilloscope printout of the same Yaskawa Servo Motor before we recharge the magnets on this Servo Motors BEMF.                                          

Here we have remanufactured a new Yaskawa Servo Motor front flange.  We can manufacture a new front flange using the old flange and factory dimensions.      

All windings, whether they are AC or DC Servomotors, are washed, baked and tested. Throughout the assembly process each Yaskawa Servomotor Repair will be meggered numerous times. This test is to make sure there are no grounded electrical parts in the Servomotor.

We surge every Yaskawa stator to 1500 volts. This test ensures that the insulation and windings will withstand the loads put on the Servo Motor when running on a machine.

This is a Yaskawa AC stator being surge tested showing a good surge pattern 

This is a different Yaskawa AC stator being surge tested showing a bad surge pattern                                         

This is an armature from a Yaskawa CUP DC motor that needs repair.  The armature is hollow with no iron giving the servo motor very low rotational inertia.  Servotech has all the special equipment and knowledge to refurbish your Yaskawa DC CUP servo motor.           

This is a Yaskawa AC rotor being Dynamically balanced. Balancing rotors and armatures is a critical step for smoother, longer lasting life of a Motor. An imbalanced rotor or armature can cause a vibration in the machine affecting quality, and shorten the life of the servo motor.                                        

This is a typical brush rigging end bell off of a Yaskawa DC Servomotor. During the evaluation for the servo motor repair we inspect each and every brush holder. If there are any signs of overheating, wear or fatigue of any sort we will replace any or all of the brush holders including changing of the lead wires going to the brush holders.                                                     

This is what a typical brush rigging repair looks like after we have completely rebuilt it with new brush holders and lead wires going to each of the brush holders.

We use high grade sealed bearings in all of our Servo Motor Repairs. We feel that each Servo Motor repair will have a longer lasting life with sealed bearings because the seals will keep any dirt and contamination from getting into the bearing races. We also replace or install double lip seals into all of our rebuilt servo motors for added protection against contamination.  All of our Servo Motor Repairs recieve new seals, o-rings, gaskets and sealed connectors to ensure that your Servo Motor is properly protected. We also use a two part epoxy coating for an added layer of protection, which is very useful on servo and spindle motors that have exposed laminations.  This coating is the same coating that the Navy uses on submarines.

After each Yaskawa Servomotor is assembled they are back driven to check that feedback outputs and motor BEMF all meet factory specifications.  At this time we align the Yaskawa Servomotor windings and encoder outputs to each other.                        

 

Alignments on Servo Motors are also one of the most important preliminary tests that have to be checked before and after any Servomotor gets refurbished. This is an oscilloscope printout of a standard alignment on a Servomotor.                                                    

The final Servo Motor Repair process is to run your Servo Motor on the factory drive just like the one in your machine. This final test 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 nameplate voltage and current. We are constantly buying new drives in order to stay up to date with new technology.

Finally, we make all new name plates for each of our Servomotor Repairs. We put all of the original data on the name plate, even contacting the original 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 completed.

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