Can Anyone Help Identify These Stepper Motors?

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In summary, it is possible to find datasheets for stepper motors if you know where to look, but they may be more difficult to find than you think. It may be worth salvaging the chips from a printer that you pulled apart.
  • #1
bassplayer142
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I have multiple stepper motors i pulled out a printer and I can't seem to find any datasheets on anything. For example one of the motors is made by OKI and it has numbers 3Y25AE1 and QH4-4490. I have looked all over the internet and I can't find anything. If anyone knows a good idea to try it is greatly appreciated. Thanks
 
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  • #2
If needed, you can easily map the windings using a multimeter or a simple DC continuity tester.
 
  • #3
If you have a 5 volt supply able to supply an amp or two, you can watch the shaft of the motor while you put the 5 volts across the different wires. If nothing happens, reverse the polarity.

It is worth marking the motor or attaching a sticky label to the shaft as the movement can be very quick and you might miss it.

Something else you can do is to do a search for the printer you took the motors out of and try to get a circuit diagram. This will tell you quite a lot about the stepper motors.

Most of these motors have two separate windings and 4 wires. this means they are bipolar motors and need their polarity reversed during rotation.

We had a similar question a few months ago and I found the following website then which seems to cover stepper motor theory quite well.
http://www.haydonkerk.com/ResourcesandDownloads/StepperMotorTheory/tabid/192/Default.aspx
 
  • #4
Thanks for the input. I don't know much about stepper motors at all as I have never used them, but I am willing to learn. I should have included that on the sticker it also says DC24.2V 3.8(ohm) and 3.75Deg/Step.

Is that voltage the maximum voltage that can be applied to the motor? I'm not looking for torque at all since a mirror will be mounted on the motor so 5V-12V with the same speed output would be sufficient. I'm trying to build a laser scanner with it. thanks again.
 
  • #5
To make this work, you have to identify the windings, then build a driver to control in sequence which coils to activate:
 
  • #6
Unless you especially like that stepper motor, it may not be the best choice.

3.75 degrees per step is pretty rough as most stepper motors seem to be 1.8 degrees per step.
3.75 means 96 steps per rotation while 1.8 means 200 steps per rotation.

Also, that power requirement is pretty inconvenient. 24.2 volts across 3.8 ohms is 6.3 amps.
It might work on less, but if you have to be switching and reversing 24 volts at 6 amps, that will be a serious controller.

You would need to drive a controller chip like a L297 with a microprocessor and this L297 would drive a power amplifier like a ULN2075 which would then drive the stepper motor.

On the printer you pulled apart, there may already be similar ICs to these, and they could be worth salvaging as these chips are not cheap.
 
  • #7
Ouch, I already threw away the chips. I'm really just experimenting right now so if the degree/step is too high I can always buy a better one or develop another way like galvos. I think I will just experiment with lower voltages and a mcu and see what I can do. Thanks for the input.
 

1. What are the common challenges in identifying parts?

Some common challenges in identifying parts include outdated or incomplete information, lack of identification markings or labels, and variations in parts due to manufacturing processes or modifications.

2. How can I accurately identify a part?

Accurate identification of a part can be achieved by using reference materials such as technical drawings or manuals, consulting with experts or manufacturers, and utilizing labeling or marking systems.

3. What should I do if I am unsure about a part's identification?

If you are unsure about a part's identification, it is best to seek assistance from a trained professional or consult with the manufacturer. It is important not to make assumptions or guesses, as this can lead to incorrect identification and potential safety hazards.

4. How can I prevent problems with identifying parts in the future?

To prevent future problems with identifying parts, it is important to have a well-organized inventory system, regularly update reference materials, and properly label or mark parts for easy identification. It can also be helpful to regularly train and educate employees on proper identification procedures.

5. Are there any tools or technologies that can aid in identifying parts?

Yes, there are various tools and technologies that can aid in identifying parts, such as barcode scanners, RFID tagging, and computer-aided design (CAD) software. These tools can help to streamline the identification process and reduce errors.

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