Hurco KM3P servos

So I got a package deal on 2 hurco KM3P and a haas tm1. It was take all.or none and I dont have the room for the hurco. After them sitting for sale at the usal.sites I sold the tooling and the spindle off as no one wanted them. So I'm particularly g out the stuff I want and scrapping the rest.
So I now have 6 of thease DC brushed servo and none of them have their data stickers complete.
So I'm wondering if any one knows what they are and their specs? Because I have them allready I'm debating on using them as servos on a cnc plasma table with a 7i54
I'm keeping allot more then just the servos but this is what I'm having a hard time identifying.
Thanks

I pulled one of the encoder covers off and heres what I found. Nice and shiny

Ya I did notice there are 4 big brushes and 2 smaller ones. There are 4 wires that go Into the motor. It seems one goes to each of the 4 big brushes.After taking the servo controll boards out of the cabnet I noticed a large cap that said 150v. Also found the drawing fornthe motor assembly but it only gives hurco part numbers.

Well the encoders say 5v on them so ya they would fry.
The servo controll unit has a info sticker saying 90v 15amp continues and 20amp.max giving it approx 1350w or about 2hp. The machine was rated at 250ipm and the lead screw is 6tpi giving it about 1500rpm. Looks like I'll need a couple 7i29 to run the motors.

Ok sorry for the confusion. What is the tacho used for? I did notice there are 4 big brushes and 2 small brushes. I figured the big ones were for driving the motor and the small ones the tacho?

Ok. What would the tacho be used for in linux cnc