I believe Baldor makes a drive rated at up to 27amps that takes +-analog or step & dir. has encoder, resolver or hall feedback They are the FlexiDriveII version.
If you have resolvers for commutation (AC motor) then you generally cannot remove them and fit encoders, you would have to add the encoder to the shaft.
The motion cards like Galil etc, will output 2 sinusoidal signals to a more economical drive as made by A-M-C and Copley etc, but this requires 2 axis channels per phyisical axis. so for 2 axis you would need a 4 axis card.
Resolvers were fitted to early DC motors like Fanuc etc because they are noise prone free, but usually are geared up to increase the otherwise low resolution.
Al
CNC, Mechatronics Integration and Custom Machine Design
“Logic will get you from A to B. Imagination will take you everywhere.”
Albert E.