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Author Topic: Unipolar stepper motors  (Read 4953 times)

sasquatchjones

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Unipolar stepper motors
« on: March 22, 2016, 01:04:24 AM »
I have taken on the challenge of building my own 3D printer out of salvaged parts. On my journey I have stumbled upon a couple of unipolar stepper motors.

I was wondering how I could use them in my project.
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jinx

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Re: Unipolar stepper motors
« Reply #1 on: March 22, 2016, 02:39:00 AM »
from what I read unipolar aint the best option  you need  convert them to bipolar stepper  you gonna have to open the stepper and solder centre tap wire together. do you have a the make and model number.
« Last Edit: March 22, 2016, 03:06:23 AM by jinx »
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sasquatchjones

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Re: Unipolar stepper motors
« Reply #2 on: March 22, 2016, 08:34:24 AM »
That's some good info already. I have two different ones.

Mitsumi: m42sp-5d
Nidec: rk2-0063

I was able to find a data sheet on the mitsumi, but not the nidec. I did read about the center tap issue. Aside from that, should I be fine?


Thanks for the input and quick response, you guys Rock!
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jinx

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Re: Unipolar stepper motors
« Reply #3 on: March 22, 2016, 11:20:26 AM »
      here's one of those moment I hope am well wrong!!. but looking at the spec sheet for the Mitsumi  is a little feeble at 26.5mN·m/200pps, another issue is the shaft it looks short  and about 3 mm in diameter, where the common pulleys used on a printer has a 5 mm bore hole for the shaft. and the Step angle : 7.5˚.  although  good for precision, common steppers for a reprap builds .8 to 1.8 not sure if the .5 be an issue!.
                   these steppers come in handy for the likes of DIY pen plotters, I'll not be too keen on using them for a 3D printer. and reusing the belts that came with them aint good, read before  they can stretch with the force of the printers  XY jerk and acceleration.
   
« Last Edit: March 22, 2016, 11:26:19 AM by jinx »
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mogul

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Re: Unipolar stepper motors
« Reply #4 on: March 22, 2016, 11:51:24 AM »
I have taken on the challenge of building my own 3D printer out of salvaged parts.

YES!! another recycler!
Have a look at my build over here: http://www.robotrebels.org/index.php?topic=13.0

Cant wait to follow your project, to see you progress and to snatch some ideas for my own build

On my journey I have stumbled upon a couple of unipolar stepper motors.

I was wondering how I could use them in my project.

Regarding motors, they can be too small, be aware that with steppers torque go down fast when you increase speed. Puny motors equals a dead slow printer!

sasquatchjones

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Re: Unipolar stepper motors
« Reply #5 on: March 22, 2016, 12:23:19 PM »
Quote
YES!! another recycler!

Mogul...you are my inspiration for this project. So far...I've spent 0$ on this project and it's just as well, my budget is tight. I haven't looked at your project in a while, so I'll have to take a peek.

I'll keep digging around, but this is some good practical advice. Maybe I'll use the motors for a smaller application.
One can never have too much Velcro.

bdk6

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Re: Unipolar stepper motors
« Reply #6 on: March 23, 2016, 07:09:36 AM »
Unipolar motors are exactly the same as bipolar with the addition of the center tap(s).  They are usually either 5 or six wires instead of the 4 of a bipolar.  the additional wire(s) are for the center taps.  With a six wire motor, the center tap wires can be completely ignored as if they weren't there.  The coils are still isolated from each other and you simply use it as a bipolar.  With a 5 wire, you can usually do the same, but the two center taps of the coils are connected together and brought out to one wire.  It "should" still work fine, but there may be a very slight performance loss since the coils are not completely isolated.  But, the coils act as voltage dividers and the center taps will usually be at half voltage so they should almost always be at nearly the same voltage anyway.
In short, use the four wires and treat them just as a bipolar motor.  Do note you will need to double the voltage from what is needed for unipolar use.

mogul

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Re: Unipolar stepper motors
« Reply #7 on: March 23, 2016, 11:16:47 AM »
I'll keep digging around, but this is some good practical advice. Maybe I'll use the motors for a smaller application.

Well, I would just start building, and be prepared for radical design changes in the process. Start with what you have and see how far you can get, then you will be in the best position to judge where you need a specific part.
Would be a bummer to invest in expensive motors if better bearings is what you really need.

 

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