drive for Fanuc "red cap" brushless motors

[jmelson]

Originally Posted by nn2211nn I do not have a large variety of Fanuc red cap brushless motors to test and .... But what DIY or Hobby servo driver can run fanuc servo motors YES or NO ? ... ________________________________________________________________________________________________________

With this new adapter for the commutation signals, mine can. See
http://pico-systems.com/acservo.html
for the drive, and
http://pico-systems.com/univpwm.html
for the controller. The commutation adapter is not a finished product yet, I want to make the encoder resolution a dip-switch option and then need to have PC boards made.

These products may be just a little more expensive than traditional hobby-level products, but such motors as the A06B-0315 motor are not going to be used on traditional hobby CNC machines!
You'd find these motors on machines that weigh at least 6 tons and up. You can (and people HAVE!!) put them in their garages, but you'd have to expect to pay a bit more for retrofit components that for a desktop mill.

Jon

[sp1nm0nkey]

If you don't mind, could you explain the proprietary interface? How does it differ from a standard quadrature A/B and 3 hall signals?

[Al_The_Man]

As I understand the quadrature encoder signals are passed through as-is.
The problem with these motors is they do not have standard BLDC commutation signals as Fanuc produce a pseudo sine wave from a 4 bit code.
Jon's unit takes the 4 bit code and together with the encoder, produces the standard simulated Hall commutation signals required for BLDC.
So far I have had to replace the whole encoder to get the BLDC tracks.
Al.

[jmelson]

OK, I am going to send out the encoder converter board for fabrication this weekend. So, I should have a real product out in a couple weeks for the Fanuc motors. It can be used with any industry-compatible brushless drive, such as Servo Dynamics, Copley, AMC, etc. that need the UVW "Hall" signals from the motor.

Jon

[jmelson]

I now have the Fanuc encoder converter boards back from the fab and have it working. Let me know if you're interested, and what your encoder resolution is. I want to make sure I get all the encoder resolutions included in the program. I'm thinking of pricing these boards at $150 each. I know that sounds high, but if you consider the effort installing and properly aligning an industry-standard encoder to the motor's poles, it may not be so bad. I should have pictures and more data up on my web pages in a couple of days.

Jon

[jmelson]

I now have the Fanuc encoder converter boards ready. See a pic and some data on it at
http://pico-systems.com/oscrc4/catal...products_id=29

Jon