Re: Power supply transformer setup questions...Capa...

Dave,

1) Motor torque is proportional to phase (coil) current.
2) Coils have inductance.
3) Inductance has a property called inductive reactance.
4) Inductive reactance is measured in Ohms, and:
5) Inductive reactance is proportional to frequency (speed).
6) Inductive current is inversely proportional to speed (Ohm's Law).
7) The voltage across an inductor is proportional to speed.
8) The power absorbed is constant with speed (Watts = (6) * (7)).
9) Motor output is proportional to speed (Power = (8) * eff).

Mariss







--- In CAD_CAM_EDM_DRO@yahoogroups.com, "turbulatordude"
<davemucha@j...> wrote:

> ---------------------------------------------------------
> >
> > 2, Oranges) Sizing a power supply for 1 or more drives. This
> depends
> > on the motor's rated phase current, speed and load. The required
> > current is independent of power supply voltage.
> >
> > The 2/3 business is the maximum power supply current our step

motor

> > drives will draw from the power supply at maximum load and speed.
> It
> > can be much less at light loads and moderate speeds. Finally, it
> only
> > applies to our drives and not anyone else's.
> >
> > This is covered in detail in "The Entire Step Motor Basics
> > Whitepaper.pdf" available from the Support section of our website
> > www.geckodrive.com
> >
> > Mariss
>
> Oranges ? I think I must be eating something a little more potent.
>
> The FIRST line of the white paper reveals the clue....
>
> "The motor power output (speed times torque) is determined by the
> power supply voltage and the motor's inductance. The motor's output
> power is proportional to the power supply voltage divided by the
> square root of the motor inductance."
>
> Inductors is where my ignorance comes in...
>
> Dave