Re: [CAD_CAM_EDM_DRO] Stepper motor pinout?

The 5-phase motors can be wired up as a uni-polar drive with 5 fet's or
transistors. It means you'de either need to make some logic gates or use an
8255 card using 5 control bits to get the pulse sequence right, but
it is do-able. I haven't tried it yet, but I do have a burger - lahr 5-phase
driver laying around, so I probably won't have to.
But if you have to, it can be pulsed in a simular sequence to a 4 phase
unipolar.

phase ecitation is:

1 0 0 0 0
1 1 0 0 0
0 1 0 0 0
0 1 1 0 0
0 0 1 0 0
0 0 1 1 0
0 0 0 1 0
0 0 0 1 1
0 0 0 0 1 etc.

I think the idea is you can go faster cuz, the field
in each winding has more time to decay .

Art
Art

----- Original Message -----
From: "Jon Elson" <jmelson@...>
To: <CAD_CAM_EDM_DRO@egroups.com>
Sent: Saturday, August 19, 2000 11:44 PM
Subject: Re: [CAD_CAM_EDM_DRO] Stepper motor pinout?


>
>
> Rick Dulas wrote:
>
> > Howdy All! I have come across an anomaly that I need your collected
> > wisdom to decipher.
> >
> > I have a stepper made by Oriental Motor ~3 3/8" or 85 mm dia with 6
> > leads, the label says 2.1ohm .4A/phase .72 degrees/step. Easy money so
> >
> > far. When I put the ohmmeter on the leads to suss out the coils I find
> >
> > that 1 lead is 2.1ohms to the other 5 leads. And the other 5 are all
> > 4.1ohms from each other. This doesn't look like any coil topology I've
> >
> > seen before.
> >
> > This stepper came out of a working piece of machinery so I don't
> > suspect
> > that any of the coils are bad. But I am baffled. Any ideas? I was
> > really
> > looking forward to driving my 4th axis with beast.
> >
>
> Yup, Oriental Motor makes the steppers sold under the Vexta brand, and
> they are
> 5 phase! They are not compatible with other stepper drivers. Vexta
> drivers are
> available surplus, but they are not very common. The key feature of the
> 5 phase
> design allows much higher speeds before torque falls off.
>
> Jon
>
>
>
>
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