servo drive

vre wrote:

What options exist for driving ac servos > 3kw with resolvers from linuxcnc?
I mean ac servo drives that accept ste-dir or analog +-10v and read resolvers > 3kw power

3kW is pretty big. STMBL, Mesa, Pico and Granite drives all top out at <= 2.2kW.

If you are not in a hurry then the next generation of STMBL might have a power stage that can be substituted by bigger components.
(STMBL does natively support resolvers)

Pico converters or the Mesa 7i49 can read the resolvers. That opens up the possibility of commutating in LinuxCNC and driving non-resolver drives. (the bldc component can emulate a fairly good range of commutation signals).

If you get lucky, or have a lot of money, I am pretty sure that the Control Techniques Unidrive can use resolvers.

vre wrote:

Also i have a lot of allen bradley inverters powerflex 40 4kw
Can i do something with these inverters?

From a quick scan of the manual, I would say not.

What is the voltage and current rating of the motors? This Youtube video claims 290V 20A

Which is a lot more than the normal STMBL rating. I don't know if he used a different power stage in the STMBL.

Are all the motors equally big? Typically they get smaller towards the effector end.

Odd how the VA and kW figures can be so different.

I think it is worth asking on the STMBL Gitter. They have been used for quote a few robots now, and they accept resolver feedback and link to LinuxCNC as a Mesa smart-serial device. All very convenient.