> I recently bought an Astrosyn (p/n 23LM K005 P3) 8 wire stepper motor
> ... There is 20 ohms resistance between the following wire pairs:
> - Red stripe/ white
> - green stripe/black stripe
> - red/black
> - green/orange
Here's an experimental program to try. Wire any pair of motor windings
in seriea and apply a modest voltage -- 1 or 2 volts should be enough,
and certainly no more than 5. The point is to keep the magnetic fields
low enough that you can't demagnetize the permanent magnet but high
enough that you can feel the resulting torque.
Turn the rotor with your fingers. If you get no torque, you've wired the
right two coils in series, but you've got the currents flowing in a
direction where their fields cancel each other. If you get medium
torque, you've wired the wrong coils in series. If you get high torque,
you've wired the right coils in series.
The goal is to form two center-tapped windings from the 4, knowing that
the 4 windings are really two pairs of windings, where the two wires in
each pair are wound around the same pole pieces of the motor's stator.
The color codes may be rationally assigned. If so, red-stripe should be
connected to red, and green-stripe to green. Rationality in assigning
wire colors is not universal!
Quote:> To make matters more confusing there is one light blue wire left over (9
> wires total) that does not appear to be connected to anything.
It could be a ground wire for the motor frame. Green or black would be
more normal colors for such a wire, but the motor manufacturer's internal
standard color code may have preempted such a coloring.