Amps vs Watts

[Grebbo]

Hi all,

Ok, I have spend some time going through various threads here at the zone so that I don’t ask the same question that’s been asked a million times before and end up upsetting any of the members.
I’m currently half way through my CNC, 3 axis rougher construction and would like your opinion before I go too far:
I have 3 x 640 oz-in motors in parallel (Keling KL34H280-45-8a that run at 6.3 amps max and 2.3 volts) run through 3 Gecko 203V.

So my understanding thus far is: that the power supply should be around 46 to 57 volts ? and around 13 Amps without going overboard. Now I have read that daisy chaining of computer power supplies is Ok as far as boosting their power, so say I had 2 identical power supplies rated at 24V and 500 Watts, and once combined I was getting 48 volts at 1000 Watts, now I was always told that to calculate Amps you need to divide the watts by the voltage and in this case this would be 1000/48 = 20.8 Amps??? Is this correct. or do i need 4 power supplys to get 48 volts at 1000 watts??

Your direction would be highly appreciated.

[skmetal7]

it would be like if you put two batteries in series (daisy chaining), the voltage increases and you get the same amps. so if you had 2 24v batteries in series it would be like a 48 volt battery with the same current (amps). you would need 4 24 volt power supplies, 2 in series, and two in parallel to get 48v 1000 watts. or you could build a 48v 1000 watt supply.

[Grebbo]

Thank you for your repply skmetal7, that makes sence now..is it possible to tap in to the -12 and +12 and still get 24 volts at the rated current?? so say the power supply is rated at +12 V 10Amp and -12V 1Amp, would I get 24 V at 11 Amp?? (making the -12 volts Ground or 0 Volts)