Re: [CAD_CAM_EDM_DRO] Slo-syn Steppers

Ok, sounds good, i hadnt thought of that way to calculate(what a
dummy)windings, i should have remembered. i have opened, cleaned, put new
bearings in steppers before and had good luck. thanks, cul brian f.

----- Original Message -----
From: <ccs@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, October 12, 2001 9:08 PM
Subject: Re: [CAD_CAM_EDM_DRO] Slo-syn Steppers


>
> > Hi Gang, now it is time for me to ask a couple questions. I have several
slo-s
> > yn motors that i will reconnect from 3 wire to 8 wire, also i have some
sigma
> > steppers that are 3 wire i will also make them 8 wire. Now how can i
calculate
> > the amps per phase? or volts/amps per phase. The other question, so i
take on
> > e of these 3 wire steppers and rewind the coils with heavier wire and
connect
> > them for 8 wire how do i determine volts/amps per phase. I know the
transform
> > er routine and math but it doesnt apply here. thanks cul brian f.
>
> This is not going to be a simple project.
>
> The basic working parameter is ampere-turns. Ie, 10 turns of wire
> with 2 amps flowing is the same as 2 turns of wire with 10 amps
> flowing. Only count the turns in the part of the winding that will be
> on at any given time. You probably want a lower turn count to keep
> the inductance down, but don't let the current get higher than the
> capability of the driver you plan to use. Don't worry about the
> voltage so much... a chopper driver is a current regulator and will
> adjust the voltage as needed.
>
> When you pull the rotor out, you must slide in an iron core that is a
> tight fit in the surrounding magnet to maintain its strength. Don't
> hammer on any components or you can weaken the magnet. Don't chip it.
> Don't get any contaminents in there - the running clearences are tiny.
> And oh yeah, put it back together perfectly aligned.
>
> Have fun... in theory it *is* possible.
>
> I'm off to try running some slow-syns with a non-chopping unipolar
> drive to generate miniscule feedrates. Step frequency will be below
> 60hz... I expect the torque penalty will be minimul.
>
> Chris
>
>
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