Re: need help to make stepper motor controler
From: Mark Zenier (mzenier_at_eskimo.com)
Date: 12/08/04
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Date: Wed, 8 Dec 2004 21:11:17 GMT
In article <61fd2a61.0412071955.3f08bb07@posting.google.com>,
richard <richard@integerspin.co.uk> wrote:
>I have a stepper that i want to run a machine tool rotary
>table with.
>>From memeory it's 4 phase[8 wires] and it's rated 9.6A 2.1V ?
>it's pretty big about 4" diameter and 10" long, rated at
>something like 840ozin.
>I plan on controling the controler with a laptop.
>
>the 2.1V rating, surely it doesn't want 2.1V?
It's probably 2 phase. It's pretty commmon for (larger) stepper
motors to bring out all the wires for the dual windings on each
phase, so they can be run with either a unipolar or bipolar drive.
(A five wire unipolar drive motor is just an eight wire motor with
the right four wires connected internally).
If you have a bipolar drive, you can connect the two windings in each
phase in parallel or series. The problem for a parallel connection is
the amount of current. For series connection, the inductance is
up to four times higher than a single winding, as they're coupled
magnetically, and this can limit the top stepping rate.
Mark Zenier mzenier@eskimo.com Washington State resident
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