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PICList Thread
'[OT]: Bi-Polar stepper motors'
1999\02\05@210414 by Lynx {Glenn Jones}

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Hello everyone,
       sorry for the OT-edness of this post, but i have a little stepper
motor which i got from a 3.5" disk drive which was used to move the
read/write heads. The problem is that its bipolar. I plan to drive this
motor using 4 pic pins connected to buffers, with each buffer's output
going to one of the 4 wires. then ill set two adjacent pins opposite to
get a differential. However, in which order should i set and reset the
pins? btw, i did search the internet for this info, but to no avail,
everything dealt with unipolar steppers. thanks alot.

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A member of the PI-100 Club:
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1999\02\05@223830 by paulb

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Lynx {Glenn Jones} wrote:

> However, in which order should I set and reset the pins?

 Half- or full-step?  You will of course require bipolar (totem-pole or
H-bridge) drivers.

> btw, i did search the internet for this info, but to no avail,
> everything dealt with unipolar steppers.

 Did you try http://www.doc.ic.ac.uk/~ih/doc/stepper/index.html#other ?
It directs you to www.st.com/stonline/books/pdf/docs/1679.pdf
which is Signetics-Thompson App note AN-235.  It seems to give a fairly
good discussion.

 In general, have you looked all through
www.doc.ic.ac.uk/~ih/doc/stepper/control2/connect.html
http://www.doc.ic.ac.uk/~ih/doc/stepper/
http://www.cs.uiowa.edu/~jones/step/index.html ?
--
 Cheers,
       Paul B.

1999\02\06@113108 by w. v. ooijen / f. hanneman

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Add buffers and bleeder diodes between the PIC and the stepper!
Then the (single-coil) stepping is simple:

step  coil1     coil2
1      forward  nothing
2      nothing  forward
3      backward nothing
4      nothing backward

BTW all 3.5 inch drive steppers I saw used part of the drive's frame
as second bearing for the stepper shaft. Do you have a stepper
which has both bearings in the stepper housing?

regards,
Wouter.

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{Quote hidden}

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--
> A member of the PI-100 Club:
> 3.1415926535897932384626433832795028841971693993751
> 058209749445923078164062862089986280348253421170679

1999\02\06@155418 by Brian Whittaker

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Hi Glenn
Have you tried the company I work for?
http://www.svskits.com/Resources/Motion/Stpnote.htm

. . . Brian


> {Original Message removed}

1999\02\06@182238 by Quentin

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This told me a lot about all kinds of stepper motors and how to drive
them:
http://www.cs.uiowa.edu/~jones/step/types.html

Hope it helps

1999\02\06@182454 by Quentin

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This told me a lot about all kinds of stepper motors and how to drive
them:
http://www.cs.uiowa.edu/~jones/step/types.html

Hope it helps.
Quentin

1999\02\08@053422 by Langezaal, M. - AMSXE

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Hi Glenn,

I use the Motorola SAA1042 bipolair stepper motor driver. And it works fine
for small motors!
It is capable of driving 500mA/Coil, Half step, full step and direction.
It also has the capability of setting the maximum current through the coils,
which became quite handy as my stepper motor coil has a resistance of only 8
Ohms which creates way too much current.

If you need the data sheet I can mail it to you personally (~100K)

Greetings,
Mark Langezaal
mark.langezaalspamKILLspamklm.nl

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