Step motors, are these good for anything

[AleksMK]

Hello all, this is my first post, and I hope that there will be more of them in the future

Today I got myself 4 step motors from an old junkyard and they have all been taken out of old copy machines. They are from Servo Japan and the model is KE56KM2-039. I couldn't find any info for them on the internet, and the only thing that is on the sticker is that they are 1.8deg/step motors.

Does anyone know any more info about them? Also, I can move them with my fingers using very little effort, so I'm wandering, will they be powerful enough to be used in a DIY CNC machine ?

Thanks to anyone who will try to help

[eaglezsoar]

See the following link:
http://www.cnczone.com/forums/showth...ht=KE56KM2-039

Regards

[AleksMK]

Originally Posted by eaglezsoar See the following link: http://www.cnczone.com/forums/showth...ht=KE56KM2-039 Regards

I've look at that thread many times, but as you can see, the information given there is obscure. I'm looking for some more in-depth info about it, like its holding torque and its voltage

73's

[CarveOne]

Originally Posted by AleksMK I've look at that thread many times, but as you can see, the information given there is obscure. I'm looking for some more in-depth info about it, like its holding torque and its voltage 73's

This is their website list of currently available step motors and it looks like your part number is either an old one or is an OEM part number for a particular customer. The search utility didn't find it. You could try going to their home page to see if they will reply to an email.

CarveOne

[RomanLini]

You can get a pretty good idea of the wattage of the coils based on the motor size. If you post a photo we can tell you the wattage. The "56" in the number probably indicates a size23 (56mm) frame.

Then you connect the motor to a variable DC power supply, and measure volts and amps, slowly increasing them until you are operating the motor at roughly the correct wattage.

At that point you can easily test the holding torque with a ruler and some hot melt glue, see this page;
How to measure stepper motor torque

[AleksMK]

Here are some pictures of them, I've put up a ruler and a CD next to them for comparison purposes :




I don't know the rated voltage, but I've tested them out on 5 V and they seem strong, because I wasn't able to turn them by hand when they were powered up.

[RomanLini]

They are size23, which is a 56mm frame. They appear to be single stack, which is the length of the motor.

I have a quite a few very similar motors here, they are unipolar, usually about 5W/coil (5v 1A) and some are 6W/coil (5v 1.2A).

You can power up the coils at 5W with no risk, in a unipolar configuration, then it is easy to measure the holding torque using the system shown in that link I posted above.

I would expect them to be about 50 to 60 oz-in, enough for a small hobby engraving machine using 10 TPI threaded rods etc, but they would not really be suitable for a larger or faster machine.