Re: Shinano Kenshi Steppers

Don Hughes wrote:

>
> From: Don Hughes <pencad@...>
>
> > Don;
> >
> > These are unipolar motors
> >
> > The two red wires are one winding and the two green wires are another
> > winding.
> > If you are going to run them in Bipolar mode then do not connect the
> > white or
> > black wires to anything as they are the center taps. To run them in
> > unipolar
> > mode you would normally connect the white and black together and connect
> > that to your power supply. The motors with the connectors cut off I used
> > for quite a while and I am sure they are ok. The motors with the
> > connectors
> > came out of working equipment so they should be good, but you never
> > know.
> > Let me know what you find out. No hurry though.
>
> OK....that makes things somewhat clearer, as to how I will hook them up.
>
> >
> > When checking the motors the resistance between the two green should be
> > between
> > 8 to 16 ohms, one green to the center tap wire should be 1/2 the first
> > reading.
> > I can't remember the exact reading. Same goes for the two red wires. The
> > problem
> > is some multimeters do not differentiate between 6 ohms and 12 uhms to
> > well.
>
> I must be doing something wrong on my end for checking. I get the same
> ohms no matter what. Should I be holding some wires together and then
> check..???. Bill, do you know what the red and green wires and their
> tracers were for(eg. step and direction..etc)now that I know the black
> and white are center taps.
>
> Thanks again
>
> Don
>
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Bruce;

Burning the midnight oil?

Not sure what you mean about step and direction on the motor. Step and
direction are handled by the controller. The step and direction of the
motor is determined by what
phase or phases are being powered and in what order. All handled by the
controller.

Here is a good web site that will explain everything you wanted to know
and more about
stepper motors.

http://www.cs.uiowa.edu/~jones/step/

As far as the resistance readings go

Are you saying you read the same resistance from a red wire to the white
as red to red?
Is this an analog or digital meter? If it is digital is it an
autoranging meter or do you need to set the range. If not autoranging
make sure it is on the lowest range possible. If you are on the 100k Ohm
range it won't be able to to tell the difference between 6 and 12 ohms.
Although it should not make any difference, make sure that you are not
touching metal portion of the leads or the bare wires when you are
measuring.
It's possible that your meter is not to accurate at the lower range.
What brand is it. At work we have Simpson 260 analog meters and Fluke
digital meters. When looking for
shorts on wires I always use the Simpson, It just seems to work better
for that.
My old boss used to tell me "that Fluke will *&$#%^% yue every time".


Bill