Re: Shinano Kenshi Steppers

Don Hughes wrote:

> From: Don Hughes <pencad@...>
>
> Has anyone got a color coding diagram for Shinano motors?
>
> Also has anyone got any idea of how to decode their serial no.'s?
>
> I have received 5 steppers and have no idea of their torque rating. Four
> of the motors are Ser. No. STH-55D203-02, and the last one is a Shinano
> 06320-105. All motors are 5V 1A, 1.8 deg step.
>
> The first four motors are 6 wire, and the last one is an 8 wire model.

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.)
These motors can be used with the half-winding drive, and 4 transistors
for the whole motor. You put the DC supply through a resistor to the
center tap. Ignoring the center tap, you can drive these motors with
2 full bridges, from the winding ends. This takes 8 transistors, but
gives better torque, and higher speed.

The other motor has 4 separate windings. This is just a bit harder to
decipher, but it has 2 pairs of 2 windings. These can be set up as
center tapped, parallel, or series. Running them parallel, with 2 full-bridges
gives best torque and speed. That could add up to more power than
your driver can put out, although that would only be 2 amps/winding
in parallel. You probably have to drive the coils one at a time, and
by finding which connection nulls out current in another winding, you
can determine which 2 windings are the pairs, and which way they are
polarized.

Jon