Re: [CAD_CAM_EDM_DRO] Stepper motor pinout?

Jon Elson wrote:

> 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

Just stole this off another site:

Haven't done this for about 10 years, but if there is 10 wires, and 5 poles, and you know the proper voltage, try this:

1. Pick a wire at random. Apply voltage from this wire to another wire. Turn the shaft a bit and see if the rotor
locks. Repeat this process until you
identify all of the winding pairs.

2. to determine sequence, apply voltage to one pair, and get the rotor locked. Next, pick another set of wires and
apply voltage. Watch which
direction and how far the rotor turns. Play around with this to get the proper direction, Look for the minimum
amount of shaft rotation between each
step. Basically when you have the correct order, the shaft will turn the same direction and the same amount with
each step. Just keep putting your
test voltage
between pairs to determine this.

It would probably be easiest to rig up a small terminal strip and stand for the motor, unless you have 3 eyes and
about a dozen hands to hold
everything in place.


As an alternative, I guess you could check the motor case for a manufacturer and try to get a data sheet, but what
fun would that be?

Good luck,

Dave

>
>
>
>
> Welcome to CAD_CAM_EDM_DRO@...,an unmoderated list for the discussion of shop built systems, for CAD, CAM, EDM, and DRO.
>
> Addresses:
> Post message: CAD_CAM_EDM_DRO@egroups.com
> Subscribe: CAD_CAM_EDM_DRO-subscribe@egroups.com
> Unsubscribe: CAD_CAM_EDM_DRO-unsubscribe@egroups.com
> List owner: CAD_CAM_EDM_DRO-owner@egroups.com, wanliker@...
> Moderator: jmelson@... [Moderator]
> URL to this page: http://www.egroups.com/group/CAD_CAM_EDM_DRO
> FAQ: http://www.ktmarketing.com/faq.html
> bill,
> List Manager