Re: [CAD_CAM_EDM_DRO] Re: Stepper Motor Power supply Sizing.

In a message dated 5/29/2003 8:54:43 AM Central Standard Time,
davemucha@... writes:

> if you think about the coils, only one coil can/will be energized to FLA at
> a time. microstepping will ballance the proportion between phases. half
> stepping is half amps to each coil, quarter stepping is 1/4 ot one coil, 3/4
> to the other and so on.
>

Dave: I don't know what East European text on stepper-technology you have
been reading, but GO BACK TO SCHOOL before you waste some money on hardware that
won't do the job you need to do!

I don't know what is the "industry-norm" right now, but when I began fiddling
with steppers (6-wire, unipolar), the "nameplate amp rating" was the current
flowing in ONE coil, but the "total current" would have been TWICE that, as
there were TWO such coils in use in FULL-STEP. Yes, in "Half Step", the current
flows in BOTH coils only half the time, so the "average" would be 1.5 times
the "nameplate rating".

AND, in a newer "bipolar" (4-wire) running "full step", the "total current"
is TWICE the name-plate current, again!

If you can get 'em to spare the postage, see if you can get Superior Electric
to send you some catalogs and "manuals", if they still call 'em that! There
is MUCH basic info about all this in those texts. Sorry, I can't be sure
WHO/WHAT owns S.E., right now, as I heard Warner sold it, already. Or?

I'd leave you with a link, but my AOL software is corrupted, and they will
NOT hire folk who have the competence to HELP with that, so I can't give you a
"blue underlined link" right now. But Superior Electric is easy to find with a
SEARCH.

Jan Rowland




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