Which PSU and drivers do I need ?

[eurikain]

Alright, I guess my case is worse than I thought. I appreciate the effort you put into explaining this to me, but am unfortunately not smart/good enough with electronics to understand what you are explaining...

Let me explain what I understand:
- You're explaining a way to build my own power supply. I don't really feel comfortable building it myself. I'd rather have an already built power supply..
- I am using 3 x 2.8A motors (here is their spec sheet) plus 1 x 3.2A motor (here is its spec sheet). I connect to each of these motors an AM882 driver. I calculated 80VDC required, and 3*2.8+3.2 = 11.6A required. However, I understand that because of the PWM On/Off cycle mode of the AM882 (as you explained, but as I also read in AM882 manual), only 60-70% of the theoretical voltage is needed. That leaves us with the following requirements: 56VDC (70% of 80VDC), 8.12A (70% of 11.6A).

That's where I loose you... I don't know what transformers or primary/secondary capacitors are, what they're used for, why I need them, and where I wire them... I most likely have missed some thread on the forum explaining the basics of building your own power supply :/

The only thing I understand clearly is that I need a power supply that can provide 56VDC and 8.12A and that anything above is of no hurt but to my savings.

Or am I just completely off the line and you are giving me a list of criteria to select the right power supply ?