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Posted by e c kern on April 4, 2008, 5:44 pm
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On Apr 2, 8:02 pm, "pogo"
> This ought to be good for some laughs from a few of you, but I am serious in
asking the question:
>
> Is there a way to wire up standard stepper (4, 5, or 6 wire) motors so they
can be driven forward/backward like a "normal" DC
> motor without a stepper-specific driver ? My nebulous goal in asking this is
to minimize the number of gizmos in my junk box for
> building bots: having one kind of motors that can be used 2 different ways -
by upgrading the electronics to drive them later.
>
> Thanks for any help ... and enjoy the chuckles ! :-)
> JCDeen
short answer: yes it can be done. no you don't want to.
rambling answer:
fundamentally stepper motors are the same as brushless dc motors: they
both consist of a permag rotor in a rotating field generated by a
multiphase stator coil. beyond that theoretical design, however,
there are still a lot of design tradeoffs. steppers are designed for
small step sizes, relatively low speed use, and high holding torque at
low speeds. brushless dc motors are designed for high efficiency,
minimal cogging, and high speeds.
so basically, you can use a stepper as a brushless dc motor without
much trouble because in theoretical terms they're the same thing, but
you'd be an idiot to try it, because absolutely every design parameter
of the stepper has been optimized for the opposite application as what
you're trying to do. it's like asking "why bother having both a barge
and a sailboat when you can just attach a sail to the barge?"
-chris.
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