Mariss's Mystery Motors ( was Re: Driving unmarked steppers

--- In CAD_CAM_EDM_DRO@y..., "turbulatordude" <davemucha@j...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., "mariss92705" <mariss92705@y...> wrote:
> > Hi,
> >
> > Here's what I use for "mystery motors":
> >
> > size 23, 1 stack -- 5W
> > size 23, 2 stack -- 8W
> > size 23, 3 stack -- 10W
> >
> > size 34, 1 stack -- 8W
> > size 34, 2 stack -- 12W
> > size 34, 3 stack -- 14W
> >
> > This applies to 6-wire round motors. It does not apply to the
> > new "square" motors, but being new, they probably are not mystery
> > motors either.
> >
> > When you measure the resistance, be sure to short the ohmmeter
> leads
> > together first. Subtract the lead resistance resistance reading
> from
> > whatever you read for the winding resistance.
> >
> > To improve accuracy a little more, measure the resistance of the
> end
> > wires of the winding, subtract the lead resistance, then divide
the
> > result by 2 to get the center-tap to end-wire (unipolar)
resistance
> > of the motor.
> >
> > Mariss
> >
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., Hugh Currin <currinh@O...> wrote:
> > > Mariss:
> > >
> > > This sounds like a "rule of thumb" number. I think it was for a
> 34
> > frame
> > > stepper? Do you have similar numbers for other size steppers?
I'd
> > sure like
> > > to have this data on the shelf. :-)
> > >
> > > Thank you.
> > >
> > > On Thursday 14 February 2002 01:21 pm, you wrote:
> > > >
> > > > Figure 12W per coil. Knowing W=(I*I)/R ,then solving for
> current,
> > > > I= square root (W/R). Plug in 12/0.8 and take the square
root.
> The
> > > > answer is 3.9A or more likely 4A per phase, 3 volts.
> > >
> > > (typo in repost W=(I*I)*R)
> > >
> > > Hugh Currin
> > > Klamath Falls, OR