Re: Jan....opening steppers can......

> At their invitation, this
> Thursday I am flying up to
> the Bay Area to meet with
> and tour the facilities of
> a major step motor manufacturer.
> I will be asking questions.
> If I learn anything new or
> interesting on this or
> related subjects, I will post it here.
>
> Mariss
>

Get samples...






\>

> --- In CAD_CAM_EDM_DRO@y..., "RC" <asdf@c...> wrote:
> > You say opening up a stepper can trash them, does it de-magnetize
> them?
> >
> > RC
> > ----- Original Message -----
> > From: <JanRwl@A...>
> > To: <CAD_CAM_EDM_DRO@y...>
> > 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@b...
> > > 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]
> > >
> > >
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