help on 10 wire stepper motor

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zeb's Avatar (by Gravatar)zeb posted on
May 25, 2007, 6:32 am
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Hi,

I have a surplus stepper motor which I plan to use in robot project.
Unfortunately I have not been able to understand its wiring. (It has
10 wires coming out of it.). So I dared to open it up to look inside
so that it might clear the matter further. I have not had much success
after opening it either. There fore this request for help.

This is what it says on the motor:

Model: A2279-9214
Vextra Stepping Motor
4-Phase 0.9DEG/STEP
U.S. PAT. NO. 4,385,247
DC 12 V   0.3 A
RX7   15859

ORIENTAL MOTOR CO. LTD.
MADE IN JAPAN.


I took photos of it in the dis assembled state. Links to those are
given below:

        http://s71.photobucket.com/albums/i148/chills_01/



Please note that:

1. There are 8 poles on the stator.
2. The rotor has been divided into two parts. The "teeth" on each part
are not in line, the valley on one, is lined with the peak on the
other.
3. There are 10 wires coming out of the motor.

I have scoured the net in detail. The model no. is not mentioned in
the "Obsolete" section of the Oriental Motor website of europe/
singapore.

Having exhausted all my resources I have come looking for help here.

Any help is greatly appreciated.

Regards

Zeb


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Spehro Pefhany's Avatar (by Gravatar)Spehro Pefhany posted on
May 25, 2007, 8:07 am
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Re: help on 10 wire stepper motor

On 25 May 2007 03:32:18 -0700, the renowned zeb


Have you tried probing it with an ohmmeter?




Best regards,
Spehro Pefhany
--
"it's the network..."                          "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
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JonSutton's Avatar (by Gravatar)JonSutton posted on
May 25, 2007, 9:51 am
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Re: help on 10 wire stepper motor

I think, if you try a continuity test that you'll find:
There are 2 sets of isolated poles i.e. 2, four pole, 5 wire steppers.
With a multimeter on Ohms you will probably find very high resistance
between any one wire and 5 others - that is they belong to the 'other
set' and a fairly low resistance between any particular wire and the
other 4 in the same set.
If you measure each wire to the other four in a set then one wire will
show half the resistance to the other combinations - that is the common
for that set and the other 4 are the poles. Pole to Pole measurement
will give you the resistance through 2 poles. Pole to common is only 1 pole.
you'll just have to find the correct sequence by trail and error then....
It should run with just one set connected - but by using both sets
alternately you'll halve the step size.
Hope this helps. It's only a (semi) educated guess.

Jon.

zeb wrote:


Pogo's Avatar (by Gravatar)Pogo posted on
May 25, 2007, 1:23 pm
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Re: help on 10 wire stepper motor


The patent itself can be found at this link: =
http://www.google.com/patents?id=cNo1AAAAEBAJ&dq=4,385,247

As diagrammed, I count only 8 wires for 8 poles, but I'm guessing the =
"extra" 2 wires are a result of it being wired in 2 sets of 4 poles =
each, which would give you 5 wires per set. Each 2 poles within a set =
has a common wire between them. 4 poles within a set are wired in =
series, with one wire coming out between each 2 pole - giving you a =
choice of how to wire it - unipolar, bipolar, etc.

Hope that helps and everyone *please* feel free to correct me if I am =
leading him wrong !
JCD

DaemonWalking's Avatar (by Gravatar)DaemonWalking posted on
May 28, 2007, 12:50 pm
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Re: help on 10 wire stepper motor

If you really want the pinouts for the Motor then you could just send
an email to  techsupport@orientalmotor.com or call them at
1-800-GO-VEXTA (1-800-468-3982).

Just a thought

The Hirudinea


On Fri, 25 May 2007 13:23:29 -0400, "Pogo"


http://www.google.com/patents?id=cNo1AAAAEBAJ&dq=4,385,247

wires are a result of it being wired in 2 sets of 4 poles each, which would give
you 5 wires per set. Each 2 poles within a set has a common wire between them. 4
poles within a set are wired in series, with one wire coming out between each 2
pole - giving you a choice of how to wire it - unipolar, bipolar, etc.

him wrong !


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Gordon McComb's Avatar (by Gravatar)Gordon McComb posted on
May 25, 2007, 3:40 pm
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Re: help on 10 wire stepper motor


Because the plate says it's a four-phase stepper (rather than a five
phase stepper, and the pics seem to bear that out), then I'd surprimse
two of the wires are for some sense function. The other eight are
typical for a four-phase stepper where the wiring does not use commons.

-- Gordon

dml.empsrch's Avatar (by Gravatar)dml.empsrch posted on
May 27, 2007, 7:57 am
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Re: help on 10 wire stepper motor

(Snip)


(End Snip)

A good deal of understanding on the operation
Of stepper motors can be found at
http://www.cs.uiowa.edu/~jones/step/

Unfortunately disassembling stepper motors in most cases
KILLS the motor or at least severally weakens them
see this reference
http://www.servorepair.com/servo_talk_sample.htm

A lot more information on why one should NOT
disassemble stepper motors (specifically) can be found
on 'Do It Yourself CNC' related sites such as
http://www.cnczone.com  and other CNC discussion forums / groups.

In the future, use a Ohm Reading on a meter to determine what connects
to what.



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