Author Topic: How to use unipolar stepper motors with a 3d printer?  (Read 1715 times)

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Offline SmallHuz

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How to use unipolar stepper motors with a 3d printer?
« on: November 15, 2021, 04:35:52 pm »
I have bought 3 unipolar stepper motor and would like to use them in a 3d printer. I have been reading some articles about half coil configuration, bipolar series coil configuration, complete conversion by means of cutting internal pcb lanes and/or disoldering coil wires and soldering them back in another configuration.

Which method mentioned above would be best to use. If not is there any stepper motor drivers designed for unipolar stepper motor for 3d printer. If there is does it needs some sort if modifications or is it just plug and play type. Steppers that I bought are 6 wire Minebea Astrosyn 23km-k343-g01 . This are older steppers with little to none tehnical information about them on the internet.

Sorry for my english and thanks in advance.
 

Online langwadt

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Re: How to use unipolar stepper motors with a 3d printer?
« Reply #1 on: November 15, 2021, 04:58:05 pm »
if it is six wire you just ignore the center taps and connect it as a bipolar
 

Offline SmallHuz

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Re: How to use unipolar stepper motors with a 3d printer?
« Reply #2 on: November 15, 2021, 05:52:41 pm »
So basicaly bipolar series configuration as I have wrote.
Thank you very much.
 

Online langwadt

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Re: How to use unipolar stepper motors with a 3d printer?
« Reply #3 on: November 15, 2021, 06:05:15 pm »
So basicaly bipolar series configuration as I have wrote.
Thank you very much.

you can also use half the coil, the lower inductance might be an advatage
 

Offline brucehoult

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Re: How to use unipolar stepper motors with a 3d printer?
« Reply #4 on: November 15, 2021, 10:11:37 pm »
if it is six wire you just ignore the center taps and connect it as a bipolar

Five wire seems to work fine just ignoring the common wire, though I've only ever tried it with low power steppers -- the very common and cheap ($1 in volume) 28BYJ48 apparently designed for moving air conditioner unit louvers -- not the big chunky ones needed to accelerate 3D printer mechanisms.

I don't *think* there's any great problem if the X and Y coils both try to drive at the same time -- you just get analogue half-stepping :-)
 


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