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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
Reply-To:	geda-user AT delorie DOT com

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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!!!

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<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>

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