Re: Shinano Kenshi Steppers

> 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.

Thanks Jon, I have printed this and hopefully it will help.

Cheers,

Don Hughes