Power supplies

Hi there,

I've ordered a 4 axis unipolar kit from Xylotex and have bought 3
4.5V 2.5A/phase stepper motors for a CNC conversion. I'm planning
on running 4 motors eventually.

What spec power supply would you use for this setup?

I'd also like to know if it is actually safe to run steppers at a
higher voltage than they are rated? If I ran mine at, say 24V, and
they are only rated at 4.5V, am I going to end up completely
destroying them (obviously the current would be kept within the
rating)?

Regards
Warren