Re: [CAD_CAM_EDM_DRO] Jan....opening steppers can......

You say opening up a stepper can trash them, does it de-magnetize them?

RC

----- Original Message -----
From: <JanRwl@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Sunday, May 26, 2002 3:41 PM
Subject: Re: [CAD_CAM_EDM_DRO] help!


> In a message dated 26-May-02 16:40:49 Central Daylight Time,
mabw@...
> writes:
>
>
> > The stepper motors I have are 3 volt , 4 amp 6 wire jobs and I want to
get
> > the most torque out of them with no real concern about fast feed rates
so ,
> > do I wire them as 4 wire leaving the center taps vacant, if so what is
the
> > resistor value required? or do i 4 wire using two end taps and the two
> > center taps , again what size resistor? I know the guide that came with
the
> > drives does explain it but as I am so hopeless with this stuff that i
would
> > rather ask the experts than stuff the drives!<<
> >
> Mark:
>
> I hope FOR YOU that Mariss will answer this question specifically! What I
> suspect is that these are MO92-FD08 S.E. motors (or equiv.). I think
Mariss
> will tell you to use the "center tap" and one end, insulating the other,
for
> "ONE phase", and LIKEWISE for the "SECOND phase", but if speed is not a
> problem, you might get a TINY bit more torque by using "ALL the copper",
by
> using only the ENDS of each winding, insulating the "center taps". This
will
> increase the inductance FOUR-fold, I think it is, and make the possible
> stepping-rate MUCH lower.
>
> As to which current-limit resistor to use, Mariss will have to instruct,
as I
> never had to USE a "six wire" on a bipolar drive, so I have ignored the
> "rules" about current for "half coil" and "full coil". It is NOT the
same,
> and I understand, and all, but I did not memorize the "math". Duh...
Sorry!
>
> Sadly, opening a stepper can severely damage its specifications, if not
total
> it, but "in theory", at least, if you could examine the connections
inside,
> to the "inside ends" of those center-tap lead-wires, and separate, and
> bring-out BOTH (if two), then, you'd have an EIGHT-WIRE motor, and you
could
> parallel pairs and have a "100%" 4-wire bipolar motor! But consider this
> ONLY if you can afford to TRASH the motors in question, and have more to
use!
>
> Bipolar rules!!!
>
> Regards! Jan Rowland
>
>
>
> [Non-text portions of this message have been removed]
>
>
> Addresses:
> FAQ: http://www.ktmarketing.com/faq.html
> FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/
>
> OFF Topic POSTS: General Machining
> If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
> http://www.metalworking.com/news_servers.html
>
> http://groups.yahoo.com/group/jobshophomeshop I consider this as a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.
>
>
>
> Post messages: CAD_CAM_EDM_DRO@yahoogroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@yahoogroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@yahoogroups.com
> List owner: CAD_CAM_EDM_DRO-owner@yahoogroups.com, wanliker@...
> Moderator: jmelson@... timg@... [Moderator]
> URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO
> bill,
> List Mom
> List Owner
>
>
>
> Your use of Yahoo! Groups is subject to http://docs.yahoo.com/info/terms/
>
>