X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:date:message-id:subject:from:to:content-type;
        bh=ALnhxpPG8TDluoAr8YpdotTOYFUMhp5FwIRGQLX4laQ=;
        b=u0WOqLYWa6TYjq1cDklTIO6FGO0bM5FnctimYvj+qEn5UXRCA8wrFl6IQZpgblWaKb
         /WF/Cawp4YnDjthcfF760i4GueDmrqx8lSTxFDOwOOKejliFqL9Qz9l49OqwuAgbAeD8
         YfOq6JiqrAhGxxvAxr7fbs2zq0hzL6LVjJeTKNc4ZqWP1078JK1UTdjBUHA5a5455+au
         B+oQ9Vz1RJYgXbJJGa55KrSlP27X3K+JU/xAqfryuVg9EKRD/5H6BhMDq3uIMmRsdnLk
         h/K2g8gvwd7RhUHY4WgIdRaI48thYd8wpA8/V2OIglCz23cJf8TRAFj3SIlaanluAJia
         bDmw==
MIME-Version: 1.0
X-Received: by 10.52.100.3 with SMTP id eu3mr703624vdb.68.1402007975334; Thu,
 05 Jun 2014 15:39:35 -0700 (PDT)
Date: Thu, 5 Jun 2014 18:39:35 -0400
Message-ID: <CALSZ9gqmmaFUXO6+Nt7g0+OJmQKbuq1UowtiTFaPQ6DiO3fERA@mail.gmail.com>
Subject: [geda-user] Seized gear motor ~ steering questions and advice
From: Rob Butts <r DOT butts2 AT gmail DOT com>
To: geda-user AT delorie DOT com
Content-Type: multipart/alternative; boundary=20cf3071c706579aaa04fb1e6b02
Reply-To: geda-user AT delorie DOT com

--20cf3071c706579aaa04fb1e6b02
Content-Type: text/plain; charset=UTF-8

I got a cheap 12V gear motor from ebay and was using it to turn the shaft
of a trolling motor.  The control circuit for it is a pwm controlled 3amp 8
pin motor driver.  With the trolling motor on a stand I simply applied 12V
from a battery to the gear motor to ensure that it would in fact turn the
trolling motor shaft.  This worked fine in either direction.  I have a
photointerrupter mounted adjacent to the shaft to keep track of turning and
direction.

I then tried powering the gear motor via the motor driver circuit.  I set
the pwm to about 30% duty cycle and set it to power the gear motor for 100
ms.  I could hear a brief sound.  I then changed the pwm to 80% duty cycle
and changed it to 500 ms.  There wasn't really a sound and now the gear
motor is seized.

Any thoughts to why it seized?  To be honest I have no idea if the gear
motor is brushless or brushed.

After reading a tech note from Allegro I think I should be using a stepper
motor.  I have no experience with stepper motors.  Is this a better way?
It seems like I would have more control of direction (steps the motor
turns).

Thanks!!!

--20cf3071c706579aaa04fb1e6b02
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>I got a cheap 12V=C2=A0gear motor from ebay and was u=
sing it to turn the shaft of a trolling motor.=C2=A0 The control circuit fo=
r it is a pwm controlled 3amp 8 pin motor driver.=C2=A0 With the trolling m=
otor on a stand I simply applied 12V from a battery to the gear motor to en=
sure that it would in fact turn the trolling motor shaft.=C2=A0 This worked=
 fine in either direction.=C2=A0 I have a photointerrupter mounted adjacent=
 to the shaft to keep track of turning and direction.</div>
<div>=C2=A0</div><div>I then tried powering the gear motor via the motor dr=
iver circuit.=C2=A0 I set the pwm to about 30% duty cycle and set it to pow=
er the gear motor for 100 ms.=C2=A0 I could hear a brief sound.=C2=A0 I the=
n changed the pwm to 80% duty cycle and changed it to 500 ms.=C2=A0 There w=
asn&#39;t really a sound and now the gear motor is seized.</div>
<div>=C2=A0</div><div>Any thoughts to why it seized?=C2=A0 To be honest I h=
ave no idea if the gear motor is brushless or brushed.</div><div>=C2=A0</di=
v><div>After reading a tech note from Allegro I think I should be using a s=
tepper motor.=C2=A0 I have no experience with stepper motors.=C2=A0 Is this=
 a better way?=C2=A0 It seems like I would have more control of direction (=
steps the motor turns).</div>
<div>=C2=A0</div><div>Thanks!!!</div></div>

--20cf3071c706579aaa04fb1e6b02--