Closed and Open loop current control for Brushless Servo Motors 3

[FeX32]

Hi guys,

I have been having an issue finding and specing a drive/amplifier for a motor (

http://www.baldor.com/catalog/BSM90N-275AA)

Closest I have is this:

http://www.kollmorgen.com/hi-in/products/drives/servo/s700/s700-servo-drive/

(to which I'm not sure will work)

I want to be able to run it in torque/current mode (with internal fast PI loop). But, I also want it to act like an amplifier and not have an internal current loop active.
That is, I would like to be able to have a mode where I can supply a voltage via my controller and have the Amp feedback the current, and then my controller reacts externally.

Are there any motor drives that are high performance in their built in current loops (via analog in) and also with the ability to run open loop current control?

Thanks for the help,

Fe

 

[FeX32]

Also, thanks for the comment about commutation before current loop.
I managed to get the pic you referenced. Very useful.