The Mrs aint gonna be happy about this little project!

[r0bsk1]

Just a quickie in prep for building a PSU. I've got 5 MA860 drivers rated at 7.2A each driving 3.1nm steppers.
When I come to use all 5 stepper they wont all be maxed out at once. What rating of transformer should i be looking for?
I'm looking at 1200VA 2x50 at 12A each. Wire the output in parallel and get 24A. Yes this is below 7.2x5 but would i ever exceed that machining wood/composites/Ali?

[Jonathan]

Bit of a hand waving explanation here, but in short...The the motor coils are rated for 2.1A, and you'll put them in parallel so 4.2A per motor. Due to them not drawing anywhere near full power most of the time, you can design for about 2/3rds of that, so 2/3*4.2*5=14A. 50V, so P=50*14=700W. So you need the nearest size transformer, or combination of transformers above that rating - so most likely 800VA. Plus some capacitors and a rectifier. I've currently got a 500VA and 325VA to power 5 or 6 of those motors.

[r0bsk1]

Ah the ruddy motor windings! New i was missing something. Ta