Re: [CAD_CAM_EDM_DRO] Question on Power Supply

Bruce:

It frustrates me there are SO many wizards "in here" who spec. newbies'
power-supplies, and it is clear 80% of them haven't a clue!

First, you say your drivers are rated up to 30 VDC. An unregulated 28 or 30
VDC supply WILL exceed that, at least at times, and BLOW your drives. Use
no more than a 24 VDC unregulated supply!

Next, your motors have two windings drawing 1.5 A each @ 2.3 VDC. That
simply means each draws about 7 watts. The drives are PWM types and supply
24-30 VDC in short pulses, the pulse-width determined by the speed of rotation at
the moment and the need to hold the current per phase to 1.5 A. So, say you
have only 24 VDC raw voltage; a 7 watt motor/driver combination will need,
then, only 7/24 = 0.292 A. If your 24 VDC supply will deliver, then, 0.3 to
0.5 A per motor, that is ALL you need! I'd go for 1 amp per motor, just to be
sure. But you do NOT need a supply that can deliver 3 amps per motor! See
Mariss' white paper!


[Non-text portions of this message have been removed]