Re: [CAD_CAM_EDM_DRO] Q's on simple stepper circuit

Hi Phil,

If you just want a simple "power drive", you can certainly use it. I
suspect you'll need to belt drive it, and possibly give it some speed
reduction, say 3:1, to get a little more torque. The motor you have is
undoubtedly unipolar, so a simple L/R driver (four TIP 120 darlington
transistors) and a 10 ohm or so resistor should drive it. a quad
open-collector inverter package drives each of the four transistors.
I'm sure I just saw a circuit for one on a web site recently posted to
this list.

The "36 phase" is a little confusing, I would expect 7.5 degree, which
would be 48 steps. You'll need about a 24v transformer, a bridge
package, and a cap. These are probably in the typewriter. Look for the
motor connections, trace back to the "transistor board", and then back
to the transistor drivers, if they're obvious, you have the parts you
need!

Drive with a 4-phase controller program.

Hope this gives you some ideas!

Alan KM6VV


phil-jaster@... wrote:

>
> I was recently given a Cannon AP 200 Electric Typwriter.
>
> After tear down, I found a real nice Sankyo Stepper Motor, and some
> circuitry to run it.
>
> The stepper is marked Volts 27 Ohm/coil 36 Phase 4 Degree/step 7.5
>
> I would like to use as much as I can of the circuitr yto just run my X
> axis on my TAIG Lathe.
>
> I don't think that it needs to be CNC jsut a simple toggle switch to
> toggle the stepper on and a reversing DPDT switch is really all I need
> for a first project.
>
> Is the circuit from the Typewriter going to supply me with that, or
> will I need to need to build something from scratch???
>
> What is the most simple of stepper circuits possible???
>
> Any clues as to where I could go to find such a circuit diagram?
>
> If I need to build such an item I have bread boarded circuits before,
> but it was a thousand years ago before there were even IC's!!!!!
>
> Thanks in advance for any and all response,
>
> phil