A 4 wire stepper motor requires 4 separate pulse sequences to run: 90 deg(+ - 0 0), 180 deg(0 0 + -), 270 deg(- + 0 0), 360 deg(0 0 - +). Notice that sequence 1&3 and 2&4 are basically AC pairs. All that switching is usually done with an array of transistors and a controller to time the pulses 90 Degrees apart. Using AC, you can mimic it. The capacitor is there to delay the one field by 90 degrees. If you have chatter, then the 2nd field is more or less than 90 degrees off the first. Get a bunch of small caps that are rated for at least the voltage of the motor and start connecting them in parallel. when the motor runs the smoothest, then add up the ferrads of all of them and get a capacitor that size. Make sure caps are rated for AC. Example: small 24v stepper used two CBB22 caps for smooth operation. Hope this helps. Great vid by the way.
@pankajB66
2 жыл бұрын
I have a 6 terminal motor. Can I add an inductor in the third coil to get the pulse another 90 deg? Will it work?
@edifiedsquid8061
3 жыл бұрын
Thx for keeping it simple and to the point and not wasting our time with useless info. Great work!
@mikesaunders7667
2 жыл бұрын
Very useful thank you and it works so well. For all those wondering, it is an 12VAC transformer he is using.
@ludicscience
2 жыл бұрын
Thanks
@ramdhansaiidi4746
7 жыл бұрын
Yeah i make it right now, printer stepper motor, 12v ac transformer, 220 micro farad cap, i folowed ur steps nd it's done . thumbs up for u Sir nd 5 stars for ur instructables. Thousand thanks from tunisia.
@gscott69
8 жыл бұрын
This is great. I just salvaged a stepper motor from an old printer and I'm now using it to open and close the blinds in my living room using this method. I'm using a DPDT toggle switch to switch the capacitor from one coil to the other to reverse the motor. A simple push button in-line with the power feed operates it.
@ludicscience
8 жыл бұрын
+gscott69 Glad you like it!
@YuanLiuTheDoc
8 жыл бұрын
Excellent idea to use inductive current to identify coil terminals! As you are using LED, polarity of terminals can also be detected. (Same if a DC voltmeter is used.) As such, wiring can be completely determined without trial and error.
@chanakyasinha8046
5 жыл бұрын
Use multimeter 😑
@Ab-qv8zc
2 жыл бұрын
The diode will light up either way because the stepper motor produces ac. Once you rectify the ac to DC it will only work if the polarity is correct
@rafsoc1613
4 жыл бұрын
Thank you, that’s exactly what I was looking for. I will watch the add so you can make a little commission on this.
@zaidhussain5206
8 жыл бұрын
Thank you so much for sharing knowledge, that also mean you need AC supply to let motor operate .
@cw4608
4 жыл бұрын
Recommended by Jeremy Fielding. Thank you for this tutorial.
@driveitbreakitfixit7496
8 жыл бұрын
you just blow my mind...i didn't know how to run them before so i was going to get rid of them but thanks to you i know how to run them so for that i will subscribe
@ludicscience
8 жыл бұрын
+Matthew Lucyshyn Thanks
@Bandicoot803
8 жыл бұрын
In general: It's the exact same circuit like a 230V single phase ac asynchronous motor where you declare one coil as a primary coil and the other one as an auxilary coil. To achieve the best results, you have to use the following simple formula: Ut x √2 = Uc. In this example: Ut ( 12V~ ) x √2 = Uc ( 16.97V ~ ). You have to have 17V~ on the capacitor for a smooth run. Hope I could help with these informations.
@mbunds
5 жыл бұрын
+Bandicoot803+ Thanks! This formula works excellently, and has been helpful for determining voltages in a home-built driver that optimizes coil current using dynamic DSP, like the Gecko Drives do. I’m failing at this, so far, but having help from formulas like to one you provided is much appreciated!
@flickmew99
2 жыл бұрын
from this video now I have a new knowledge about how to check the coil
@conversationwithgod272
3 жыл бұрын
Nice video that you should mention that it must be alternative current otherwise it will never work with continuous current
@azimrashed93
8 жыл бұрын
Thanks for this video. My problem is slove. Thanks again.
@kaleemkawish2776
2 жыл бұрын
Hi
@jasonmare33
Жыл бұрын
thank you! can you slow motor down with different capacitor or adding resistor?
@walterbunn280
6 жыл бұрын
Heh... good stuff. An easy way to test my stepper motors without having to build a driver circuit is nifty. I like the comments where people are alarmed about AC through a brushless DC motor. It's funny stuff.
@GregorKropotkin-qu2hp
8 жыл бұрын
Excellent video with much very useful information for me with my current (no pun intended!) projects! Thanks very much for that- I will now subscribe to you and hope to learn more.
@ludicscience
8 жыл бұрын
+Gregor Kropotkin Glad you like it! I will be uploading more videos, thanks for subscribing.
@francomongillo
Жыл бұрын
Ojo con el tipo de transformador que se utilice, no se debe sobrepasar el umbral de absorción del motor, dependiendo del modelo de motor que se utilice, generalmente alrededor de 400/500 miliamperios para NEMA17, mientras que para NEMA 23 no se debe superar 1, 6 A estos son muy importantes y es raro que el autor del video no lo especifique de lo contrario con un uso prolongado el motor podría sobrecalentarse y romperse, así que ojo con el tipo de motor que estás usando, haz una búsqueda para saber las características y luego instale un transformador adecuado. Felicitaciones por la excelente explicación en video para el cambio de rotación, solo use un simple interruptor de palanca doble que se puede encontrar en el mercado. Saludos a todos.
@8bit_coder
7 жыл бұрын
Now think about it, the two wires that you can connect the cap to make it forwards and backwards, you could use an NPN transistor and an arduino and switch it on and off, therefore having variable speed.
@shawnlund
8 жыл бұрын
Nice job on the tutorial. I learned a great deal thank you.
@jeffbeck6501
9 жыл бұрын
Beautiful, simple design. So educational this video.
@ludicscience
9 жыл бұрын
+Jeff Beck Thank you.
@andrewferg8737
4 жыл бұрын
Very informative. Thanks for sharing
@felixcat4346
8 жыл бұрын
This is a wonderful combination of ac and dc. Most people are terrified of using any form of ac in hobby devices. Truth be told a shock from your main power is quite nasty but hardy fatal.
@He4vyD
8 жыл бұрын
Unless you live in Europe and have 220v mains...
@TheBlork74
8 жыл бұрын
we have 400V mains here...
@Wheresmy240
8 жыл бұрын
110v AC is very dangerous. Although the human skin can effectively resist most of the current, all it takes is for you to have a proper ground touching bare skin or for a wire to penetrate a couple layers and enter your flesh for it to kill you. An older fellow may even die from a simple shock. Don't play with AC when it's over 30v unless you're experienced.
@felixcat4346
8 жыл бұрын
Good advice, wear your seat belts, don´t swim one hour after you eat, etc, etc.
@taunteratwill1787
8 жыл бұрын
+Wheresmy240 Majoring in the bloody obvious are you?
@jovel2075
8 жыл бұрын
salamat amigo! from Philippines.
@elidari60
Жыл бұрын
It’s all sounds good how do you know which capacitor do you need you are saying that the motor supposed to be ran smoothly do I have to buy several different capacitor or does it say on the motor which capacitor do I need thank you
@thiscommentwasposted262
5 жыл бұрын
Sir, you are a very smart guy. THANK YOU FOR THIS VIDEO.
@ludicscience
5 жыл бұрын
This message was posted thanks
@jasonstraurss6974
7 жыл бұрын
this is exactly what I needed, thanks for the help!
@juggernautsvaderdmunchkinland
9 жыл бұрын
Thanks Ludic!! Always good stuff you teach!
@ludicscience
9 жыл бұрын
Brugga Jugga Thanks!
@dantudichoi1091
8 жыл бұрын
simple but effective. explaination....đơn giản nhưng sâu sắc giải trình
@kiisofttech618
3 жыл бұрын
Thank you for This simple technique
@TaxilunarTM
8 жыл бұрын
Hey friend, thank you for the valuable information! For a Brazilian, the way you speak English is very good, it is perfectly understandable. Also the way you explain it very didactic! Please answer me if the engine loses power in this type of use. I wonder if you allow me to do a similar video for Brazilian friends who do not understand English. Thanks again, please go on!
@ludicscience
8 жыл бұрын
Thanks so much!
@DillonGaming036
8 жыл бұрын
I am Brazilian and Portuguese
@winlwin9756
8 жыл бұрын
Thanks you very much L S ,this is wonderful tutorial. i have waiting another tutorials and i will subscribe twice.
@ludicscience
8 жыл бұрын
+Win Lwin Thanks
@superabbasalmani6079
3 жыл бұрын
Cool Stepper Motor is a Dc Motor, also if you contact two of them, and move One of Both, can you use them as Genrator ~ Motor . Once we used it as Encoder as well. Thank you Bro!
@tsaboupamela
3 ай бұрын
I enjoyed the video explanation. Could you please help with the testing of a dvd motor? Thank you
@rohandesigns
7 жыл бұрын
wow..this really helped my problem.. thanks Ludic
@abintechnovision8313
6 жыл бұрын
Counterclockwise is also simple...make the reverse connection.. i.e. give the supply to 2 short wires and short the another wires.. it will definitely run.
@scottydntno
4 жыл бұрын
2 questions, Where can i buy a 12v transformer and how did you power the transformer?
@cobbiesmith9267
9 жыл бұрын
Thanks for another great video very useful information
@hemashri
8 жыл бұрын
excellent. I studied a lot. thanks.
@OghamTheBold
9 жыл бұрын
So clear - so concise
@TheMinderEngineer
6 жыл бұрын
Keep hustling, big things incoming! 🚀
@wesaveukraine
7 жыл бұрын
Simple and perfect explanation. Thank you
@carivoj
6 жыл бұрын
Do you think it is a good idea to use polarized capacitor in an AC circuit?
@herksen
8 жыл бұрын
Great video ! But one remark....: In the first 2 minutes you explain about UNIpolar steppermotors, but @ 00:51 you suddenly mention BIpolar steppermotors. I guess this should be UNIpolar? Keep these video's coming.
@ludicscience
8 жыл бұрын
+Robbert van Herksen Thanks! The trick works with bipolars (4 wires)
@TheSeeparag
9 жыл бұрын
Lovely as always!
@colinwarner7762
7 жыл бұрын
Ludic, thank you very very much for this video, it is very good, I now have an idea of what to do. many regards , Colin U.K.
@purushothamanarulprasath4956
6 жыл бұрын
very simple & I learned a great deal thank you.
@rameshpatel-kw3xb
4 жыл бұрын
many thanks 🙏🙇simple solution
@JustFun-iz9rf
2 жыл бұрын
that was useful thanks
@offgrid2010
3 жыл бұрын
Great info. Years ago i played around with using stepper motors as generators so I'm surprised i hadn't thought of spinning the motor to test the leads. I have several SAS drives that are too much trouble to set up RAID. I managed to alter a SATA plug to get past the block on the SAS drive. All the contacts r supposed 2b the same but, unlike SATA drives, it does not spin. Maybe this will help me get there. Thank you for doing this video.
@danieliusb2234
2 жыл бұрын
Just check continuity with a multimeter, no need to invent a generator
@glennedward2201
6 жыл бұрын
Finding the correct capacitor is likely the tricky issue unless you have many on hand to experiment with. I did try this with a stepper and 24v ac and watched the motor shaft want to move. Clearly it’s not correct capacitor however it’s just as inexpensive to go purchase a cheap pwm control, Arduino, or whatever and use a dc power source. Less headache.
@TheMarkdo1980
Жыл бұрын
Wow, i m so Helpfull thank u
@amrali4410
8 жыл бұрын
excellent tut
@danielpuchta674
5 жыл бұрын
Thanks for the video. But how do the control system knows if the set of instruction which is sent to the motor via driver, was done? Because usually stepper motors are connected without any measuring device like rotary encoder so the system itself doesnt have any feedback if the rotation defined by steps was done. But in some cases (like if I use them for powering the axis of 3D printer) the system needs to know if the motor completed the rotation or not, and then the system can sent the command to other stepper motor to move in other axe/axis... Do the drivers have a dedicated signal for this purpose? (Like - was lastly sent set of instruction completed?). Or does it work by the principle of knowing the speed of rotation and the desired position, so the system calculates the time and after the time is reached, the system assume that the desired position was reached?
@stefenhall9919
7 жыл бұрын
Excellent Video, very informative.
@diamony123
8 жыл бұрын
Your a genius Manuel
@craignehring
9 жыл бұрын
Stepper motors are cool... thanks for this video
@ludicscience
9 жыл бұрын
I love'em.!
@ianosf
8 жыл бұрын
Excellent video, thank you
@ludicscience
8 жыл бұрын
:)
@eriko8307
6 жыл бұрын
This is very helpfull! thanks a lot!
@djonathanpacheco7987
7 жыл бұрын
A good video, use apolar capacitor for better result
@JzoneMD
8 ай бұрын
Very nice idea.. Good job..👍👍👍
@samrodian919
4 жыл бұрын
This will not work from a dc source. The leads are coming straight from the 12 volt transformer with no rectification or smoothing and the motor relies on AC to change the polarity of the magnets at 50 /60 Hz I am assuming as I do not know enough about the subject. I have just tried it using a 12v car battery and having robbed an led and several capacitors from a 24 V power supply and no it doesn't work on direct current! Oh and I had such high hopes of this method!a question I would ask is that with this method is it possible to control the speed and to reverse the direction?
@mmawad100
Жыл бұрын
great put what about the Torq ?
@angusmacgyver3673
8 жыл бұрын
does it matter if my capacitors are 50v 220 micro ferrads? how much voltage should it stepper motor require? and does it need AC power rather than DC power? thanks.
@ludicscience
8 жыл бұрын
the particular value of microfarads depends on your specific motor. you have to experiment a little. you need AC power, 12 volts AC
@hongkylieng5640
8 жыл бұрын
Angus MacGyver
@HDXFH
7 жыл бұрын
Ludic Science and an AC Cap Otherwise, Bang lol
@edwardsunnyboy
7 жыл бұрын
What about pulsed dc, will work?
@glennedward2201
6 жыл бұрын
Ludic Science your running 12v ac on a dc motor?
@ISO07ISO
2 жыл бұрын
Very very good. Thanks you.
@questioneverything4633
2 жыл бұрын
I tried this on a mitsumi m42sp-6nka LF. It didn't work. All three combinations of wiring made the motor jump by 1-3 steps, or sometimes not move at all if it was in a certain position. I can't find a way to make it run, even after trying a few capacitors. Hrm. Not sure if defective motor or stupid user...
@chivainmanfoumbi9026
8 жыл бұрын
That's hyper GREAT!!! thanks a lot bro'
@grumyoseph
6 жыл бұрын
Very good and thanks!
@da1cru1
7 жыл бұрын
Ok, I dug out a 4 wire step motor and tried the led test and it worked, so I came back to re-watch how to get it going, before I do I'm curious bout 3 main things. First is that "power" to both sides, as both output leads shown here are red, if so what grounds it? Then you said a fairly low (compared to other caps I've recovered), and recommended 25V min. I am a total novice to electronics, but some want to learn. Any help thanks..
@rwatson2609
5 жыл бұрын
Very clever my friend!
@ludicscience
5 жыл бұрын
Thank you!
@AnkitMishra-ll7ih
2 жыл бұрын
Sir, how we know exact value capacitor in our application there is any calculation. sir, please help me out in this
@jereryder394
3 жыл бұрын
Great tutorial. I'm attempting with a 4 wire, 6vlt micro stepper w/100mF cap with no motor action. Should I increase mF cap value until its running, & smoothly?
@hiksiol6306
2 жыл бұрын
Thanks for this information. Can I use a 1000 mF capacitator, and what kind of stepper motor driver controller do you recommend?
@e1hak
8 жыл бұрын
useful... thx for uploading...
@tonymak9213
8 жыл бұрын
Ukhgvhkgvkhgvhkgv
@arunavasarkar1000
5 жыл бұрын
Sir, I have taken out the motors from a old Cannon IP 1980 printer and found there are two wires. Kindly tell whether these are 24V or 12V motors. Power supply module is 24V for this printer.
@eCitizen1
5 жыл бұрын
Thanks for this information. Do you know if the stepper motor wired this way runs at a different speed, or at the same speed you would get from it when driven by a stepper motor controller? Also, is there a scientific way to determine the best capacitor to use?
@daryooshshirvan7878
4 жыл бұрын
I think the speed of the motor depends on frequency of the outlet power. Either 50 or 60 Hz.
@crate8134
5 жыл бұрын
Hi, Great solution! Could you please give me some tips on how many volts/amps AC I would need to use for a standard Nema 17 stepper motor, also what would be the best capacitor type / voltage / uF? thanks!
@nx7640
5 жыл бұрын
thank you great info
@brucewayne-px4lv
9 жыл бұрын
Excellent.
@braveheart5280
2 жыл бұрын
Is the capacitor non-polorized?
@allaboutiosgames3093
8 жыл бұрын
What is the write way to connect the capacitor means to say negative terminal of the capacitor goes to which pin
@ludicscience
8 жыл бұрын
+att singh Does not matter. However you must use a capacitor of at least 35 volts
@gristc
9 жыл бұрын
Very cool. Am I right in thinking the speed of the motor will be dependent on the frequency of AC you drive it with?
@ludicscience
9 жыл бұрын
+gristc yes, the rpm of the motor will be equal to the frequency in Hz
@Nestor11962
6 жыл бұрын
what is the capacity of the capacitor? specifically for this engine.
@AliRaza-po3yj
8 жыл бұрын
great effort Sir :)
@ludicscience
8 жыл бұрын
:)
@denishdenish
3 жыл бұрын
You mentioned the "frequency of the grid" description, which means you are running stepper on AC current and DC, is this correct? Wouldn't the AMPS in AC current burn the motor coiling, even if it is stepped down at 12volts?
@rorymerz8710
5 жыл бұрын
Do I need a capacitor if I am running a 12v DC stepper motor off a 12v battery pack. Is the capacitor only need because you are using AC power?
@ludicscience
5 жыл бұрын
You can not run steppers on dc power
@davidbolha
6 жыл бұрын
Hello, What about using an RC ESC on these type of motors ? Could they be used to drive them ? 🤔 Thanks.
@justin_704
Жыл бұрын
is the transformer needed?
@2150dalek
Жыл бұрын
Most excellent.
@TheDeathskull37
8 жыл бұрын
And then your capacitor will eventually explode, because you're running it off of AC instead of DC. Electrolytic capacitors are polar, and running them straight off of a transformer with no rectification like a diode or full bridge rectifier will cause it to receive a reverse voltage every time the wave coming through the transformer oscillates. I would not recommend running this circuit. It's applications are limited anyway, because you need an AC voltage source, and therefore cannot be run off of a battery without an alternator circuit, which would technically just be a driver anyway. Not to mention that this circuit is just plain unsafe.
@gabrielciliagallegos8962
8 жыл бұрын
Muchas gracias!
@LCMNUNES1962
3 жыл бұрын
VERY GOOD, BRASIL OK
@anthonytanner3461
4 жыл бұрын
Great tutorial - thank you - I learned a lot . My question relates to power output when running step motors in this way . How does the power output compare to running the motor with driver and or controller .Is this a viable way of using the motor to carry out practical tasks for example turning a lead screw and nut to create linear motion .? Thank you
@Enigma758
2 жыл бұрын
Probably not, because the motor is now frequency controlled and without a variable frequency controller you they can only really run at constant speed and start/stop. When you do this, you lose the ability to precisely step the motor from computer control which is probably what's needed in your application. Although if you just want to move back and forth and stop/reverse with limit switches, it might be OK for that.
@RixtronixLAB
4 жыл бұрын
thanks for the info :) does capacitor directly connected to AC supply? no polarity ?
@Vo0d0o2009
6 жыл бұрын
thank you man , ! now i can try this now and complete my tilt mechanism of my own motorised telescope head :D , thanks Brother ( the printers compagny ) because i can salvage old printers and builds somes angry robots
@cphVlwYa
9 жыл бұрын
should the cap value form a resonant circuit with the induction of the coil an the frequency of tge transformer?
@rmarsh9997
8 жыл бұрын
I hve several from an old server cassette drive..however they have 9 wires ..does this hack work the same on the 9 wires?
@opongelli
4 жыл бұрын
I didn't realize, what's the value of the electrolytic?
@starchaser2489
7 жыл бұрын
What size capacitor should I try on this very small 5v motor? 2-phase 4-wire stepper motor micro stepper motor with slider track DIY Features: 【Phase Resistor】30ohm 【Voltage】5V Note: About the Small Motor, We dont have more Information. Please know that before you do the purchase.
@reneofngol2398
5 жыл бұрын
Tnx for very informative video my friend. May we can use this motor for robotic arms??😀
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