The New Machine

[Jonathan]

i would recomend the kelinginc kit as the motor are low impedance and give the best performance. UK motors seams to have a lot higher impedence and poorer performance.

Surprising that you imply all UK motors have a high inductance. It clearly depends which you get and where. Can you link to a datasheet for the ones you have so we can compare?

Edit, actually ignore that - found it:

http://www.kelinginc.net/KL34H295-43-8B.pdf

To be fair that's quite a low inductance for that size motor. Still with a Nema 34 motor you really should be running it on a LOT more than 50 volts.