FANUC SERVO MOTOR REPAIR PROCEDURES

Every Fanuc Servo Motor that is refurbished at our facility goes through an extensive evaluation to not only find the failure with your servo motor but also to make sure we will be able to bring your old, broken down Fanuc Servo Motor back to life as if the factory just sold you a new one.

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

During the evaluation we look for any dynamic or static parts that do not meet fanuc specifications.

In order to properly repair your Fanuc servo motor we need to have a good working relationship with the factory and original technical data sheets to obtain the finite specifications for the servomotor.  Using this information we can fully repair and test your motor so that you know it will not run ok, it will run as if it was new.

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

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

This is an oscilloscope printout of the BEMF (back electromotive force) from a Fanuc servo motor with bad magnets.             

We can remagnetize rotor magnets.  The Fanuc from above had its bad magnets remagnetized and now produces a proper BEMF as seen here                      

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

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

On AC stators we surge every stator at 1500 volts. This test ensures that the insulation and windings will withstand the loads put on the Fanuc Servo Motor when running on a machine.

This is a stator being surge tested showing a good surge pattern.                     

This is a stator being surge tested showing a bad surge pattern.                       

This is an armature commutator. The commutator is where the bar to bar testing is performed. The commutator is the surface of the armature that the brushes run on to deliver the power to the armature windings. Most failures occur right at the connection of the commutator bar and windings.                                      

This is an armature being dynamically balanced. Balancing rotors and armatures is a critical step for smoother, longer lasting life of a Fanuc Servo Motor.  An imbalanced rotor or armature can cause a vibration in the machine that will affect the finished  parts that have been machined.        

This is a typical brush rigging end bell off of a Getty’s Fanuc DC Servomotor. During the evaluation for the Fanuc 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 Fanuc 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 Fanuc Servo Motor Repairs. We feel that each Fanuc 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 put double lip seals in the front flange of the Fanuc Servo Motor to keep any coolant from getting to the bearing. All of our Servo Motor Repairs use ALL new seals, o-rings, gaskets and connectors to ensure that your Fanuc Servo Motor is protected from water contamination. We also use a two part epoxy coating for an added layer of protection. This coating is the same coating that the Navy uses on their submarines.

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

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

The final Fanuc Servo Motor Repair process is to run your Fanuc Servo Motor on a Fanuc 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 Fanuc Servo Motor at full voltages and full currents of the Fanuc Servo Motors capability. We are constantly buying new drives in order to stay up to date with the manufacturer’s changes.

This is a Fanuc Spindle Motor drive running
a Fanuc Spindle Motor.                    

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 Fanuc 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 Fanuc Servomotor Repair was done.