Re: simple stepper power question.

Alan,

This is for a step motor. The accuracy is +/-5% if done carefully.

Mariss

--- In CAD_CAM_EDM_DRO@y..., Alan Marconett KM6VV <KM6VV@a...> wrote:
> Hi Mariss,
>
> This sounds like a plan for a DC motor, are you saying it will work
for
> a STEPPER motor too?
>
> Alan KM6VV
>
>
> mariss92705 wrote:
> >
> > Dave,
> >
> > Yes there is. All you need is a multimeter and a calculator. Do
the
> > following:
> >
> > (1) Measure your DC voltage accurately
> > (2) Set the meter to DC Amps
> > (3) Put it in series with the power supply to the drive
> > (4) Run the motor at a known speed (greater than 1 rev / sec)
> > (5) Measure the power supply current at no load on the motor
> > (6) Now the tricky part. Load the motor down and note the current
at
> > the moment the motor stalls. This may have to be repeated several
> > times to get an accurate reading.
> > (7) Take the difference between the no-load current and the stall
> > current. Multiply the result by your power supply voltage. The
> > product will be the motor output power in Watts mechanical.
> > (8) The torque at that speed will be: oz-in = Watts * 4506 / full
> > steps per second
> >
> > Mariss
> >
> > --- In CAD_CAM_EDM_DRO@y..., "dave_ace_me" <davemucha@j...> wrote:
> > > is there a formula to determine power of a stepper ?
> > >
> > > I have a Slo-Syn NEMA 34, 1.7 volt, 4.5 amp
> > > single stack.
> > >
> > >
> > > Also, has anyone put together a simple test
> > > for stepper power ? Seems like a weight,
> > > and a long crank arm with holes drilled
> > > each inch would allow one to keep moving
> > > the wieght farther out until the motor
> > > started missing steps.
> > >
> > > Dave