Stepper Motors

[Don.F.Broadus at ucm.com]

The article in Radio electronics by Don Lancaster talked about the
feasibility of an alternator as a stepper but he concluded the the step
angle would be to great  for practical uses. Most steppers are 1.8 deg
between  steps. The alternator would be in excess of 
30 degrees if I remember right. I want to try an alternator as a brushless
motor using 6 transistors to commutate the windings.
I have found  lazer Printers and plotters a good source for high torque
steppers. Copy machines might have the stepper you need also. If you have a
bi-polar stepper (4 wires) you can experiment with a IAC driver delco 23266
and some external power transistors.
Unipolar steppers (6 wires) are easier to drive and many circuits are on the
web if your search for stepper motor.
 
Don 
 


   
  

> -----Original Message-----
> From:	steve ravet [SMTP:Steve.Ravet at arm.com]
> Sent:	Monday, January 11, 1999 11:17 AM
> To:	diy_efi at efi332.eng.ohio-state.edu
> Subject:	Re: Stepper Motors
> 
> Not sure how big you need, but older hard drives and floppies (early
> 80's, think 8 inch floppies and full height 360K 5" floppies) had
> steppers quite a bit larger than todays drives do.
> 
> If you need bigger than that, there was an article in radio electronics
> a few years ago about turning an alternator into a stepper.
> 
> --steve
> 
> Robert Harris wrote:
> > 
> > Any clues for sources of inexpensive 12VDC small stepper motors ( but
> bigger
> > than those used in hard drives).  I think I may have a need if they are
> > reasonable in power, speed and price.
> > 
> > Thanks.
> > 
> > The Luddites were RIGHT!!
> > 
> > Habaneros - not just for breakfast anymore