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Converting a 28BYJ 48 Stepper Motor to Bipolar Format - Part 1
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- Опубликовано: 17 авг 2024
- In this episode we convert a unipolar 28BYJ-48 stepper motor ( amzn.to/1guGQOP) to bipolar format for increase the torque output...
Tags: #DIY3DTech
when modified to bipolar mode, does the 12V version of the motor have more torque than the 5V version? I can also run the 5V version at 12V wich gives the motor more torque than running at 5V. But i am qurius to know if the 12V version would be even tronger?
Thanks! Will be doing another one as I am driving this with a CNC Ramp setup.
The firing order is orange, pink, yellow, blue works for me. Also I wanted to add that I found that just giving a drill bit a few turns with your fingers is enough to break the trace in the circuit board does the job just fine.
+Todd K. Yup (on the wire combos), check out my Part 2 (ruclips.net/video/k6A2VJvFFfs/видео.html) as well as the Camera slider video (ruclips.net/video/CUEwrFK8ZfU/видео.html) where I put these to work. I am also thinking of building a small 3D Printer with these (www.thingiverse.com/thing:874502) what do think?
I've been playing around with this motor, but I have to admit im not feeling the love with it.
Ive found its highly inaccurate... Say you tell it to go 100 steps one way and 100 steps another, it wont return to the same position... I had a back and forth program running on it. And after an hour the start position moved about 180'.
Also its not very fast :/ at its fastest ive manage to get it, it takes about 5 seconds to do a full 360 turn. Is that normal? Or is it meant to be a lot faster than that?
Im going to be building a speedo gauge, but I feel this motors just too slow for it.
Is it this motor or is it me getting it wrong?
Have not found the accuracy issues in my uses, however slow yes and very. However after converting they are faster and more useable. You may also want to try a couple as maybe you just have a bad motor?
These are the motors in the Micro3d printer. The problem with these motors is backlash in the gearing.
There's the gear backlash problem. But other then that, they are fairly accurate (speaking from my own experience). The start position moving 180 degrees over the course of 1 hour shouldn't ever happen. maybe a wiring problem? I observed that the stepper might rotate with a small torque even when wired up incorrectly.
I am following you through with this modification, and found that jut cutting one of those 2 lugs off on the plastic cover lets it clip back in almost as good as new without needing to glue it ! This means I can always remove it again in the future if I need to.
Yes there are several options to achieve this :-)
Didn't you say you'd link to the web page. I'm not about to watch 10 minutes of you walking me through a web page if I can just go look at the page myself. Where is the link?
I think there are reruns of the Simpson’s on you could watch rather then wasting my time with arrogant statements..
www.jangeox.be/2013/10/change-unipolar-28byj-48-to-bipolar.html
I was doing the same thing about the time you put the video out. good job. I'll be using Pololu drv8834 low voltage stepper drivers available on the Pololu website. That would be good if you posted a follow up video with the firing order of the wires when you figure it out.
I was looking for a part 2 but cant seem to find it. did you abandon this project?
+Kirk Nelson All of the videos for this should be the playlist: ruclips.net/p/PLInTrkIbj69mp-E5srW9WISNARyspJBZn
Great job, but can i use the ULN2003 after this modification, or should i use another driver such as L293D?
Thanks it has been a while, you can not use the standard driver so I used a sainsmart driver board.
full torq w/o modification is org &pink, pink &yellow, yellow & blue, blue & org, go through it backwards for reverse
Thanks for sharing will have to give this a go! :-)
Is not necessary to modify the stepper wiring. I used this motor (5VDC and 12 VDC versions) with 9 Volts and several bipolar drivers with no problem at all. The center Tap of both coils is open or at VCC/2 in all conditions. EasyDriver V4.4, A4988, DRV8825, etc.... In all cases the speed and torque was increased considerably. Remember to disable the drivers while the motor is stopped (save battery and keep the motor cool). Due to the existence of the gearbox, the stepper maintain the position without power in most applications.
While you can make the wiring work, not cutting the trace means you are forfeiting torque, take a look at this guys site he has a drawing of the mod it might make more sense then...
They will work with simple full or half step mode of bipolar drivers (both ends of each coil are always switched to opposite polarities).
Problem of keeping the short between taps with bipolar drivers may occur in microstepping mode, they may switch one end of a coil when chopping or connect both ends together to control current.
In my applications I am using full step with the AccelStepper Library... no heating problems and very high torque. Because the high gear reduction ratio microstepping is not necessary with the 28BYJ-48.
i tried doing the bipolar mod on this motor but never got any movement out of it.i was using a4988 stepper motor driver on a cnc shield. im trying to make a small cnc plotter but never got the damn moto to do anything but buzzzzzzzzzzzzzzz.i tried wiring in different order several ways but never worked....
+Jim Hill If it only buzzes, that typically means the step sequences sent to it are not right [i.e. in order] and therefore it basically vibrating.
Why do you need to dremel the board? Can't you just cut the central wire, cut the white connector at the end and then hook up the wires to something like a 4 wire A4988?
Because you need to cut the connecting trace of the PCB board. You can also do with a Xacto knife also...
The PCB trace connects the two coils. Cutting the wire would not severe this internal connection.
Hello, great video. I will try this conversion to use the motors in a Rostock delta 3D printer. I have a question please, on the diagram it can be seen that there is a bridge between the two coils. By by cutting the 5th wire does it also remove the bridge between the two coils? Or it doesn't and that bridge is something that it is needed? Thanks.
+Lucian Sima By cutting the trace yes it breaks the coil up into which stronger however with less resolution per-say (you will also need to change the driver too). You can also see more here: diy3dtech.com/28byj-48-conversion-part2/ Also yes have kicked around the Rostock however have heard they can be a bit temperamental.
+DIY3DTECH.com Thanks for the quick answer. Yes i will use the Pololu A4988 for bipolar motors., toghether with ramps and arduino mega.
+DIY3DTECH.com also about the delta printers, yes they are a lot harder to set up and calibrate but i've read they require less torque from the motors especially with a bowden extruder.
+Lucian Sima Some folks have used the 28BYJ's in 3D printers and started one but stopped as way to slow even when converted...
+DIY3DTECH.com thank you, i will try anyway
Am I correct in understanding this does not change the detent torque?
Correct if I understand your question correct in that detent torque is that of the motor unenergized.
Great video! I would like to read that article you mentioned. Where is it?
+Richard Monson-Haefel This has been a while however believe this was the site www.jangeox.be/2013/10/change-unipolar-28byj-48-to-bipolar.html and hope this helps :-) These are great little motors working a project with one right now that I will publish a new video on so stay tuned...
+DIY3DTECH.com That's the article. Excellent. Thank you!
:-)
Hi, Do you know, where i made a mistake? I hack a motor to bipolar but it work only one way, the reverse way it just whistles. Ty
Check your code as if works one way, it should work the other [mechanically] but sound like your code is misfiring the coil sequence...
Sounds like a code issue
Yea, I changed ENDSTOP_INVERT from false to true and now it is working. Thanks for help
Got to love code :-) Your welcome!
Can i directly run 28byj-48(12v) with a4988 driver?
Sorry its been a long time since I messed with these so I don't have a good answer for you...
why do you have to cut the trace, why not just not connect the fifth wire?
By cutting the trace you eliminate the center tap thus creating to "larger" magnets at the cost of halving the stepping resulting. So in short you generate double the torque output
Hmmm..., you think by increasing available torque by ~ 180% you might run the risk of the little
plastic gears wearing out faster?
+ed yup it likely does, however guess I am missing the point as the duty cycle is so large, and these so cheap it is a moot point in the end...
Hi there, if i do this modification can it work with a a4988 driver? (from a cnc shield)
Yes "if" you do the mod and be sure to run it with only 5v PW as I have pushed it to 12v but the motor is cut very short....
i have a cnc sheild (using 12v) would that work?
will burn up the motor after a short period as they guys don't like above 5volts...
there is a 12v version of this stepper...www.amazon.com/Industry-Park-28BYJ-48-Stepper-ULN2003/dp/B01J507JGS/ref=sr_1_1?s=industrial&ie=UTF8&qid=1495249168&sr=1-1&keywords=28BYJ-48+12volt
you can full step uni polar using code only also full torq
Do you have sample code?
Hi world
Hi back or is it high?