Stepper Motor Magic

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Introduction: Stepper Motor Magic

There is something magical about motors , even worse, stepper motors..You just cannot throw them away. Even a dead one can be a good source or magnets.
I have this Sankyo 5-pin stepper. I do not remember whether I took it from a large hard drive or a printer. But it is time to find a job for this handsome rotator.
But first I must identify the pins. Web search did not give much except one guy who posted it for sale on almost every website you can imagine.

Step 1:

The motor has 5 pins, colors were in sequence RED- YELLOW -ORANGE -BLACK- BROWN as shown in the picture.
the resistance measurement matrix is shown below together with my interpretation of how the coils are arranged inside.

I plan to first try to rotate it by feeding a ULN2003 driver IC from a CD4017 counter and wish me luck.


If anyone has any comment or correction, I will be thankful.

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    3 Comments

    Have a question for you. I pulled a Sankyo MSDA020L81 from an old 5.25" floppy drive today, but haven't been able to find any useful information on it. It has six pins, WHITE-RED-YELLOW-BLUE-BROWN-BROWN. I have access to quite a few of them, but I don't know enough about them to make them work.

    Any advice?

    Thanks!

    IMG_20150401_131754.jpg

    Good luck. Let me know what happens. I have a ton of 'salvaged' motors ready to install in my robot ninja army.

    1 reply

    It worked great. I fed the 4017 counter from a 2-transistor multivibrator. and then fed the counter output into the ULN2003. the multivibrator has a pulse output control square wave frequency. This eventually controlled the stepper motor speed.