RutexR2020-Fanuc DCServoMotor

[kkilst]

Has anybody done the retrofitting job using Rutex R2020 with Fanuc DC ServoMotor Type 10W, Torque-Cont. 12Nm, Current-At Cont. 15A, Terminal Voltage 105Volts, Speed 1000RPM ?
If so, may be we can share our experience on this matter.

[NC Cams]

This thread may be of some assistance:

http://www.cnczone.com/forums/showth...822#post162822

A private message to Dan Fritz (post #9) may be quite helpful as I believe he has provided insight into this type of retrofit before....

[Al_The_Man]

The early Fanuc & Mitsubishi DC servo's were either Gettys knock-offs or were made by Gettys, side-by-side they look identical and I have interchanged them, as they are fairly flexible motors, and the specs of the Rutex definately look like they would cover these motors.
I personally have not used them with Rutex, but have with other makes with no problem.
Remember to adequately size your power supply and aim for at least 3% to 5% above the terminal voltage.
Al.

[NC Cams]

I have a bunch of Fanuc servo's on some NC lathes. I don't know if they're the same as yours but:

1. Mine are simple 2 terminal DC motors. They use a complex velocity feedback system in the servo driver to take the tach feedback from the motors and convert it to a digital frequency for interfacing with the M/B by the driver cards.

The drivers are basically SCR's that convert 3 phase AC to the necessary DC.

2. The complexity comes in with respect to the on-board feedback system in the velocity control cards which are documented in the manuals that came with the machines.

I would think that you could/should be able to get documentation for your servo motors from Fanuc or elsewhere. At that point, the interchangeability viability should be determineable.

[Al_The_Man]

Originally Posted by NC Cams I have a bunch of Fanuc servo's on some NC lathes. I don't know if they're the same as yours but: 1. Mine are simple 2 terminal DC motors. They use a complex velocity feedback system in the servo driver to take the tach feedback from the motors and convert it to a digital frequency for interfacing with the M/B by the driver cards. The drivers are basically SCR's that convert 3 phase AC to the necessary DC. 2. The complexity comes in with respect to the on-board feedback system in the velocity control cards which are documented in the manuals that came with the machines.

To use these motors with Rutex or similar drives, any Tach feedback will not be needed and the tach can be disabled by removing the tach brushes if required, they will however require encoder feedback, which, if not fitted will have to replace the resolvers that alternatively may be fitted.
If resolvers are fitted, they are usually driven by a ~10:1 gearing due to their low resolution, this can be removed and any encoders can be fitted/driven by the rear shaft.
As the Original Fanuc drives/feedback is not used, no other consideration, apart from the Armature DC is necessary to use these motors.
Al.