Stepper Motors

[haku]

I have 3 of the following motors 17PM-K303-G3VS by Astrosyn. I have contacted the manufacture for info, and they told me they can't supply me with info as they were specially made for another company. These motors came out of a photocopier. If anyone can help me with getting the specs on these motors and what controller I should use with them I would really appreciate it.

Thanks
Haku

[RomanLini]

Please post a photo of the motors, then it will be easier to guess ratings or a test procedure to find the ratings.

[haku]

Ok here is a picture of it. I would like a DIY controller as I can do the PCB etching and all of the soldering etc etc my self. I just don't want to design the thing.



Thanks
Haku

[RomanLini]

It is a size NEMA 17, and has a standard 6 wire unipolar connector;

orange A1
white (common, A +power)
blue A2

red B1
black (common, B + power)
yellow B2

Being small, size 17 in a single stack (short length) they won't have a lot of power. Generally they run about 2 watts per phase or so.

If you can measure the ohms between orange and blue wires i can tell you the approximate volts and amps needed for the motor.

The type of driver will depend on the volts/amps of the motor and if you want good microstepping performance, or if you want one that is very easy to build and has less performance.

[haku]

Ohms between Orange and Blue wires is 5.4 ohms

Thanks
Haku

[RomanLini]

That's fairly low ohms. It means each unipolar phase is 2.7 ohms.

At a phase power of about 2W that means the motor is 2.3 volts and 0.85 amps per phase, if you are driving full step with 2 phases always on.

If using a microstepping driver you could probably go up to about 3W per phase or 2.8v and 1.05 amps per phase.

Since the motor is around 1 amp per phase you can use most of the low cost stepper driver chips, assuming you still want to make your own PCB etc.

You do know that with small motors like these they are only suitable for a very small CNC machine, like a little PCB engraver etc?

[haku]

How would these motors work KL23H256-21-8B Specs here

What my goals are is to drill / route PCB's. and do some HDPE or Nylon routing, and perhaps some aluminum milling.

Thanks
Haku

[RomanLini]

I'm not sure, I don't open unknown PDFs.

If you want to work with more serious cutting, especially metals, it's worth reading some build threads and looking at other people's solutions including how they made their machine rigid enough and what motors/drivers/leadscrews etc they used.

Like anything, if you start spending lots of $$ it gets easier to get high performance.

[haku]

For a controller that I can use now and in the future if I upgrade my motors I have been looking at the controller from here

http://www.pminmo.com/kreutz/mkuni.htm
or
http://www.pminmo.com/SLA7062/SLA7062.htm

The 2nd one is easier to build.

Would that be sufficient?

Thanks
Haku

[RomanLini]

If you want a SLA stepper driver I think the best one by far is this one;
SLAm Stepper Motor Controller, Allegro SLA7062M, Unipolar

but then I'm probably a bit biased seeing as I'm the guy that designed it.

If you want to save a few dollars and do all the work of etching and drilling your own PCBs and sourcing all the different parts the PMinmo version will be a little cheaper. But if you want really nice (and small!) PCBs and very easy construction, the SLAmSteppers are the way to go. I have 3 on my CNC machine.