Re: [CAD_CAM_EDM_DRO] Re: Sanyo Motor

Based on your figures this motor takes just over 4 electrical watts.
I've got a size 23 rated 150 oz-in that takes a bit over 8. My guess
is these are less than 65 oz-in, but they probably can move the
sherline at low speed. They are cheap, so perhaps you should buy two
to experiment with and keep your eyes open for better ones. I think
www.herbach.com has some decent size 23's - you need to go by the
measurements though as they don't seem to know anything about NEMA
numbers. Look for low voltage and high current for best speed
performance.

I posted last night about the sherline lathe I was given which has 20
ohm windings and a unipolar L/R drive... it moves very slowly, but it
does work.

Chris

> The shaft looked to be about 1/4 inch diameter (I'll take my calipers next
> time to measure it, but I'm sure that I can turn an adapter coupling if
> necessary) and was 1.8 degrees per step (200 steps / rev). It had both the
> Sanyo number and the IBM number on it. I didn't think to copy down the IBM
> number. If it's around 100 oz-in, it should probably work on the Sherlines.
>
> -- Carol & Jerry Jankura
> Strongsville, Ohio
> So many toys, so little time
>
>
>
> -----Original Message-----
> From: admin@... [mailto:admin@...]
> Sent: Friday, May 25, 2001 7:55 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Sanyo Motor
>
>
> --- In CAD_CAM_EDM_DRO@y..., "Carol & Jerry Jankura"
> <jerry.jankura@s...> wrote:
> > Folks:
> >
> > I've come across some Sanyo stepper motors and wonder if anyone has
> torque> specifications for them, or knows where I would look. I
> already checked the> Sanyo web site, and their current offerings do
> not match this number. I> believe that the motor was originally OEM'd
> to IBM. The Sanyo part is:> 103G770-2516
> >
> > The motor is rated 4.1volts @1.1 amp.
> >
> > Also, would these motors be suitable for driving a Sherline 4400
> lathe and> Sherline 2000 mill?
> Carol & Jerry Jankura
>
>
> Carol and Jerry,
>
> It was good to include the electrical specs, but
> we need the physical size of the motor as well.
>
> That, more than anything else; is your best guide
> to estimating torque. The same size motor can
> be made with an infinite variety of windings;
> all of which produce about the same holding-torque;
> but differ in driver-requirements, speed capability,
> etc..
>
> I doubt that part number means anything. It's almost
> certainly an OEM part number; for IBM or whoever.
>
> If it's a typical "IBM printer stepper", it's a
> single-stack size-34, with a funky shaft-size <g>,
> and a 2-deg step angle. I.e., 180 steps/rev instead
> of the more common 200/rev.
>
> And if that's what it is, then it's about 125 oz-in,
> give or take 20%.
>
>
> Note that a higher or lower phase-resistance does
> not make a motor more or less 'efficient'. It's
> simply a different winding option. A different
> tradeoff between performance and driver requirements.
>
> Torque is produced by magnetic force. Magnetic
> force is directly proportional to "ampere-turns."
>
> Ampere-turns = the current flowing in the coil,
> multiplied by the number of turns around the core.
>
> In other words, you can take a particular
> physical motor frame; and wind it with one turn
> of huge wire; pump a hundred amps into it; and
> you'll have 100 ampere-turns of magnetic force.
>
> Now, take that same exact motor frame, but wind
> 100 turns of much finer wire on it; and pump
> only 1 amp through it. You will get the EXACT
> SAME magnetic force, i.e. 100 ampere-turns
>
> Amps X turns = force (torque). It's that simple.
>
> Obviously, the 1-turn winding will be a GREAT
> high speed performer; having almost zero
> inductance. But finding a 100-amp driver for
> it might be a problem...<g>
>
> The 100-turn version will run on any 1-amp
> cheapy-chip in your junkbox; but it's not
> going to spin very fast.
>
> There are a few second and third order effects
> that do cause the holding-torque to vary a bit
> between different windings; but the above
> ampere-turns rule is 90% of the game.
>
> Hope this helps a bit,
>
> Richard
>
>
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--
Christopher C. Stratton, stratton@...
Instrument Maker, Horn Player & Engineer
22 Adrian Street, Somerville, MA 02143
http://www.mdc.net/~stratton
NEW PHONE NUMBER: (617) 628-1062 home, 253-2606 MIT