Re: ...power... (Need Mariss)

Mariss, is this right? Given my three motors at 3V/4A phase driven
by G201s do I need about 60V at 10A or 60V at 2A? Big difference in
cost!

--- In CAD_CAM_EDM_DRO@y..., NCS <ncs@n...> wrote:
> >The voltage rating on a step motor simply means if you apply 3VDC
> >across that motor's coil, 4 amps of current will flow. In other
words
> >it has 0.75 ohms resistance.
>
> Oops! I think I was being too subtle.
>
> The original post was in reference to the current required from a
power
> supply.
>
> No need for a 10amp 60 volt supply--that's 600W, enough to heat
> a small room.
>
> If three motors draw 10A max. at 3V, then one would either need
> a 3V 10A supply (not-recommended, low high-speed torque)
>
> OR
>
> a 60V supply (20 times the voltage) at 0.5 A (1/20th the current)
>
> A supply that delivers 60V at 10A is overkill.
> (I think 60V at 2A would provide a reasonable power margin.)
>
>
>
>
> >> 10A x 60 V = 600W or 200W per motor.
> >> 200W / 3V = 66.6 A per motor.
> >>
> >> Uh-oh, somethings not right!