stepper help
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I have a stepper motor that I'm assuming is bipolar. I'm trying to make it
run using the stepper motor project in the stampworks kit, but I don't know
how to alter the code made for a unipolar to a bipolar. I'm thinking the
difference is the configuration of the steps but I think I've tried
everything and it still won't work. it just holds it's position without
turning.
any help is appreciated,
amanda
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run using the stepper motor project in the stampworks kit, but I don't know
how to alter the code made for a unipolar to a bipolar. I'm thinking the
difference is the configuration of the steps but I think I've tried
everything and it still won't work. it just holds it's position without
turning.
any help is appreciated,
amanda
_________________________________________________________________
Add photos to your messages with MSN 8. Get 2 months FREE*.
http://join.msn.com/?page=features/featuredemail
Comments
Bipolar steppers require different hardware interface circuits than
unipolar steppers. Compare the data sheets for Allegro 5804 driver
circuit (unipolar) at http://www.allegromicro.com/sf/5804/, with that
for the Allegro 3967 (bipolar) driver at
http://www.allegromicro.com/sf/3967/. There are similar driver circuits
from other mfrs, but these offer a single-chip driver for steppers
running about 750 ma or less.
Dennis
Original Message
From: amanda ervin [noparse]/noparse]mailto:[url=http://forums.parallaxinc.com/group/basicstamps/post?postID=-_m92WPtLJUy1Xo9kMeb-wwayTwesxsufQfdjch4yeiTg-CbmDiKxguagmHEMQbWLWAaxlsL131aJgw]ale2121@h...[/url
Sent: Saturday, February 08, 2003 1:33 PM
To: basicstamps@yahoogroups.com
Subject: [noparse][[/noparse]basicstamps] stepper help
I have a stepper motor that I'm assuming is bipolar. I'm trying to make
it
run using the stepper motor project in the stampworks kit, but I don't
know
how to alter the code made for a unipolar to a bipolar. I'm thinking
the
difference is the configuration of the steps but I think I've tried
everything and it still won't work. it just holds it's position without
turning.
any help is appreciated,
amanda
_________________________________________________________________
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I noticed that date was Thursday, maybe you already solved your
problem.
A bi-polar stepper would be a 4 wire, or it could be 6 or 8 wire.
all you need do is to use an H-Bridge on any two coils. if it is a 6
wire, make sure the coils are on seperate circuits.
+ on line 1, coil A, and minum on line 2 coil A
then + on line 3 coil B, - on line 4 coil B
then + on line 2 coil B, - on line 1
and so on....
as you power the coils the motor would take a step for each coil. to
lock a motor, just leave power on any coil.
if you have 2 steppers and wanna have some fun, connect 2 coils from
each together. then spin one by hand. the other should spin as if
it were linked.
Dave
--- In basicstamps@yahoogroups.com, "amanda ervin" <ale2121@h...>
wrote:
> I have a stepper motor that I'm assuming is bipolar. I'm trying to
make it
> run using the stepper motor project in the stampworks kit, but I
don't know
> how to alter the code made for a unipolar to a bipolar. I'm
thinking the
> difference is the configuration of the steps but I think I've tried
> everything and it still won't work. it just holds it's position
without
> turning.
> any help is appreciated,
> amanda
>
>
>
>
>
> _________________________________________________________________
> Add photos to your messages with MSN 8. Get 2 months FREE*.
> http://join.msn.com/?page=features/featuredemail
I am using a stepper motor for the first time. So far, all I can do is make
it quiver. I am using the code from the Stampworks with a 2p. I do not have
the stepper that Parallax provides, although it has the same wiring colors.
I have tried (I think) all the combinations. My questions are:
Do the 2 sets of coils alternate are are they in pairs, meaning do I want to
put both outside leads from the same coil next to each other on the 2003, or
alternate one side from each coil?
I assume that it makes a difference which order the coils are connected. Is
there a way of determining which lead is #1?
How does one tell a bi-polar stepper from a uni-polar stepper?
All input appreciated!
Jonathan
www.madlabs.info