X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
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
Message-ID: <20140606092525.405f44d5@richard-Inspiron-N5030>
In-Reply-To: <53916E04.1020904@gmail.com>
References: <CALSZ9gqmmaFUXO6+Nt7g0+OJmQKbuq1UowtiTFaPQ6DiO3fERA AT mail DOT gmail DOT com>
	<539118CC DOT 1040406 AT buffalo DOT edu>
	<CALSZ9gpqr_ANQbrH6k9rZ8u=yadni2pCTpuFKAwq8MDifQtDgA AT mail DOT gmail DOT com>
	<53916E04 DOT 1020904 AT gmail DOT com>
Organization: Ham radio
X-Mailer: Claws Mail 3.9.3 (GTK+ 2.24.23; x86_64-pc-linux-gnu)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
X-Provags-ID: V02:K0:jn1LPED03fUGO6LJivoqs8Auiw+cVPzSzGmiG0ioU+h
 STme9uetKZeOXyiiuijhE5TygeWp8hXq9Oi+eX+e0BruimzmA/
 gWsf85N9i1Yu7ZhG0gnhwu8lFpYvbWPoaUAAWeAYQaoigwtS2u
 py9MXbhMZ80IIT/WQHORVgD2dGXkMb7wd4ByRoBQfHjLfJkCz9
 +C/3C/eQ5LabHCsnJhCy4iMtevTREnT93MYwek5m8IiPjKTvn1
 X2QsGHCGrsLmolBnafdFmg724mWEu/H7oIiWF1fTo0prh17Tfm
 M/0luWAAJsXXvtxzEudvAKmTbBaqQTWYHe0/9fn/WNL/DKMU7Z
 u0g5Ta3DeeJdlf17BLVhySVwQ7RTL1BPbxdj22gdhZtEDoaW16
 4UmGJ/MIaQz7A==
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by delorie.com id s568PVTr017662
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

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
nil carborundum a illegitemis
##################################################################################
Ham Call G8JVM . OS Linux Mint 16 x86_64 on a Dell Inspiron N5030 laptop
Maidenhead QRA: IO82SP38, LAT. 52 39.720' N LONG. 2 28.171 W
QRV VHF 6mtrs 200W, 4 mtrs 150W, 2mtrs 400W, 70cms 200W
Microwave 23 cms 140W, 13 cms 100W, 6 cms 0W & 3cms 5W
##################################################################################