[PEU]

Hello folks, Im posting looking for help identifying these motors, they are hooked to a small CNC mill, I have absolutely no reference about them, just my educated intuition. I think these are servos because they have a 4:1 reduction and have encoders on their back.

Here are photos of the units:

Both are NEMA34 mount

One is square, 8 wires coming out of it, 2 sets of the same color




the wires go to a connector:



4 of the wires are hooked together, if this where a stepper, doing this would prevent the unit from turning, or am I wrong?

The other is round, same US Digital Encoder on the back:



This also has 8 wires all different colors, but the connector is connected in the same fashion:




These are connected to a small board that looks like some sort of protection (has 4 diodes) since its not wired like a rectifier



also attached to this little board is this power resistor that looks like an energy dump:



The driver is homemade and its made out of a set of 8 darlingtons BU941ZP and three 74HC00 logic gates.

So my conclusion is these are brushless DC servos (but I may be wrong of course)

I would like to know how to determine the wires and if possible determine their voltage, so I know if I can use them with any known servo drive.

Thanks a lot in advance!


Pablo