Re: 6 wire stepper

John,

Often black and white will be the center taps in 6 wire motors. What
probably got you was that your meter does not read these low ohms
well. On some motors, the center taps will be the solid colors, while
the ends will be color, color-white. Old superior motors especially.

Keep in mind that you will get more speed from the motor (used
bipolar) if you hook up centertap-to-end on each coil, rather than
end-to-end (sometimes referred to as "full coil" and suggested for
better torque). In nearly every case I have encountered, using a
unipolar (6 wire) motor end to end is WORSE than middle to end...
twice the ohms, but FOUR times the inductance. (means takes longer
to "charge" the windings fully)

Hope this helps.

Ballendo

--- In CAD_CAM_EDM_DRO@y..., marble here <marble_h@y...> wrote:
> Chris After reading your reply I went out to the
> shop and hooked a 3 volt battery up to the red and
> blue leads It moved one step I then did the yellow and
> green and it again moved one step .thank you
>
> John
>
> The last set figures I was tring to follow Rob Langios
>
> in his book pg.34
>

> > Within each
> > group, there will be
> > one wire (center tap) which exhibits a low
> > resistance to each of the
> > other two, while these outer two exhibit about twice
> > this resistance
> > to each other.
> >
> > Your phase leads are these outer two of each group
> > that exhibit the
> > higher resitance. For a bipolor drive you connect
> > only these four
> > wires and leave the center taps unconnected. For a
> > unipolar drive,
> > you tie the other two wires together and connect
> > them to the common.
> >
> > If you get it all hooked up and the motor just
> > vibrates without
> > turning, swap the outer leads on one of the
> > windings.
> >
> > Chris
> >
> > (PS - I have a motor with the same color wires, and
> > on mine the phase
> > leads are blue&green and red&yellow. Black and
> > white are the center
> > taps, although I don't know which is which as I'm
> > not using them).
> >
> > > ok now lets see if I have it right i have six
> > wires coming out of
> > > the stepper
> > >
> > >
> > > Black
> > > Blue
> > > Red
> > > White
> > > Green
> > > yellow
> > >
> > > white/green and yellow Black /Blue
> > and Red
> > >
> > >
> > > White/ yellow = 1.1 ohms Black /Blue
> > = 1.1 ohms
> > > white /Green = 1.1 ohms Black /Red
> > = 1.1 ohms
> > > green /Yellow = 1.6 ohms Blue /red
> > = 1.5 ohms
> > >
> > >
> > > wht ,yel /grn 3.2 ohms Blk,red
> > /blue =3.0 0hms
> > > wht grn /yel = 3.0 ohms Blk,Blu /
> > Red =3.0 ohms
> > > yel ,grn/wht = 2.7 ohms red,Blue/
> > Black =2.7 ohms
> > >
> > > does it matter what one I use as a common wire
> > between the stators
> > > Can I use YELLOW for one and the BLACK for the
> > other .
> > >
> > >
> > >
> > >
> > >
> > >
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> > --
> > Christopher C. Stratton, stratton@m...
> > Instrument Maker, Horn Player & Engineer
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> >
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