Re: Power requirements
So, I want to start by saying that I totally agree with everything aargh posted... but I would like to... what's the word? Reframe? It a bit.
You don't HAVE to run 150VDC into those motors. You can run them on 48VDC. Yes, you will lose some speed, but that doesn't mean the speed you get won't be "enough".
One thing I know: Stepper motor systems are very hard to engineer and predict accurately .Gecko-drive and their documentation come closer than anyone else, but they don't tell you exactly how fast your motors will run, or rather how much SLOWER your motors will run at 48 vs 150 volts. It's quite possible that you will be just fine at the lower voltage.
So how to be sure without spending gobs of money? Well... you can't, really. But following someone elses example is a good guess. And always buy used stuff when you possibly can (especially motors) and be ready to re-sell it if it doesn't work for you.
Your motors are a good choice for a really big, slow, heavy machine. If you are building a small, fast, light machine, sell those motors and buy something else. Let the machine desired machine guide your design; don't start with the motors, or worse, with the driver as so many seem to do.
But in any case, FIRST build the mechanical parts of the machine, and since you already have the motors and 48V power supply, try them out. Might as well.
James hosts the single best wiki page about steppers for CNC hobbyists on the net:
http://www.piclist.com/techref/io/steppers.htm Disagree? Tell him what's missing! ,o)