Re: Shinano Kenshi Steppers

Don Hughes wrote:

>
> From: Don Hughes <pencad@...>
>
> > The four motors are set up with center tapped windings. An ohmmeter
> > should tell you which groups of 3 are connected to the same winding, then
> > a little more probing with the ohmmeter will tell you which lead is the
> > center tap. (The leads which have the most resistance of any combination
> > are the end 2 wires, the remaining one must be the center tap.)
>
> Well I did this and all the wire combinations that passed the continuity
> test have all the same resistance. What I have found out is that there
> are two sets of red wires, one with a white tracer on it, and a black
> wire that mate up. The other set is two green wires, one with a whit
> tracer on it, and a white wire that mate up. But as far as ohms go, they
> all seem to have the same, so finding the center tap is difficult. Any
> other suggestions Jon?
>
> Thanks again,
>
> Don Hughes
> Vancouver, BC Canada
>
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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.

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.

Bill