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Date:	Fri, 6 Jun 2014 09:25:25 +0100
From:	RichardBown <richard AT g8jvm DOT com>
To:	geda-user AT delorie DOT com
Subject:	Re: [geda-user] Seized gear motor ~ steering questions and advice
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On Fri, 06 Jun 2014 09:30:12 +0200
onetmt <onetmt AT gmail DOT com> wrote:

> Il 06/06/2014 08:08, Rob Butts ha scritto:
> > I'll try and take it apart tomorrow. In the meantime this is the
> > link to the motor:
> > 
> > http://www.ebay.com/itm/30RPM-High-Torque-Gear-Box-Electric-Motor-12V-DC-37MM-/291106511233?pt=LH_DefaultDomain_0&hash=item43c74cd981
> > 
> > Maybe you can tell what kind of a motor it is.
> > 
> > Also, I've found information on a Nema 23 stepping motor which seems
> > like what I should be using. It is a 1.8° 200 steps/revolution. It
> > is a six wire connection uni-polar or a four wire connection
> > bipolar with pinouts: A, A COM, A-, B, B COM, B- but I'm having a
> > hard time finding information on how to drive this motor.
> > 
> >  
> For this kind of stuff you should start studying stepper drivers, like
> L6474 from STMicroelectronics for instance.
> 

are you sure this is a stepping motor ?, this looks as if it only has 2
connections .
Have a look at how much current is taken when you apply some volts to
it,
Thats a high gear ratio , it may be the gear box may have lost a spur
gear tooth.

If its taking some current you can rule out brush problems, and if you
connect a scope across the connection and apply power, if the armature
is OK you will see the back emf as you disconnect power.
It will give a clue where the problem lies.

Good luck if you decide to strip down the gear box

-- 
-- 
Best wishes /73
Richard Bown
Email : richard AT g8jvm DOT com   
HTTP  :  http://www.g8jvm.com
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