driver options for fanuc

Hello.
What driver options exist that are compatible with fanuc servo motors ais series and power up to 4.5kw ?
argon/stmbl are up to 2kw what other exists for linuxcnc ?

We (pico systems) make a converter for the propietary Fanuc encoders. That is the big issue with using the Fanuc red cap motors with various brushless drives. There are Coply, AMC, Servo Dynamics, etc. drives that need traditional encoder with Hall sensor feedback, and our converter provides that.  We also make our own drives, but they will not handle 4+ KW motors.
Jon