need help to make stepper motor controler

[richard]

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?



any schematics?

thanks in advance
richard

 

[Mark Zenier]

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