Building hint: every 100-or-so winds, put a little tab tape over the wire with the wind-count written on it. If you lose count, you only have to go back to the latest tab of tape.

@Kevin-jz9bg

3 жыл бұрын

omg why didn't i see this earlier i would have saved a solid hour of my life 😂

@jaimeenvadoliya7663

2 жыл бұрын

Best idea bro

@rondeldebbio9219

2 жыл бұрын

Great tip! - could even write on each tab tape to make sure.

I'm so disappointed, expected after 8:50 a "let's hook it up anyway!". Send it to Mehdi.

@lukahierl9857

4 жыл бұрын

Or andi aka photonicinduction, even if it woud work

@BadMax02_VR

4 жыл бұрын

i hate that he is so serious he should have done it outside or something or at least at the end to show what would happen

@ProtoMan137

4 жыл бұрын

@@BadMax02_VR tbf I wouldn't have done it either. Not if I had put so much time into it xD

@alexreeve

4 жыл бұрын

Until it pops

@HPD1171

4 жыл бұрын

@@alexreeve I want FLAMES. Aww, I'm disappointed, wheres my hammer.

This is one of my most favorite projects/Videos of yours so far!! (And I've watched almost every one!) Fascinating, and really well explained.

5:10 Create 2 secondary coils and connect them in parallel!

@greatscottlab

4 жыл бұрын

Haha that was exactly my idea as well at that time. But since I would not create perfect windings, the voltage of the 2 coils would be slightly different. When connecting them in parallel, it can create a compensation current which can be pretty bad in worst cases. That is why I did not show it in the video.

@ortzinator

4 жыл бұрын

@@greatscottlab Is it not enough to have the same number of windings?

@akjrocks1100

4 жыл бұрын

@@greatscottlab hello sir

@simontay4851

4 жыл бұрын

If slightly different voltage on each secondary winding is a problem, use 0.1 ohm balancing resistors.

@GRBtutorials

4 жыл бұрын

GreatScott! And what about winding the wires in parallel? You cut the necessary length twice (or more times), then you wind them at the same time. That’s what I’ll have to do with my SMPS transformer.

These two videos about transformers contains tons of very useful info, thanks a lot for that!

@greatscottlab

4 жыл бұрын

You're welcome :-)

@robson6285

4 жыл бұрын

Indeed, i agree. Especially these two i was glad he made.

Your magnetics videos are very interesting, informative and important. The hands-on experimentation which answers real-life questions is priceless ! Thank you for your patience, dedication to-the-art, and sound scientific approach..

One of the best things about this channel is seeing the use of the Electronics equipment. Learning so much so quickly.

*Let´s get started* Those words always light up my day

Thanks for giving all these formulas in one video. It is a great reference, for people who lost their school manuals and are too lazy or cheap to buy new ones. You also clarified why the primary need x turns. As electrical engineers, I learned all that, but the magnetism part was not my favorite at that time.

Simply amazing!!. Loved how used proper calculation.

Great videos! I'll be watching these a few times and taking notes. Very useful formulas. Thank you!

Excellent procedure, result analysis, summary and presentation. Thanks

Great video, I love it when creative people do innovative things! Gets us all thinking.

I expected the 3D printed core won't work due to much less flux density but I'm curious with a 3D printed toroidal transformer because toroidal transformer uses core material with less flux density and doesn't require layer isolation like traditional transformer does.

@greatscottlab

4 жыл бұрын

Maybe I will try that out in the future.

@lukahierl9857

4 жыл бұрын

The individual windings of the core-iron acualy are isolated or relay on the oxide

@RYU47376

4 жыл бұрын

@@greatscottlab How bout R core transformer too?

@simontay4851

4 жыл бұрын

Not always isolated. Ive seen transformers before where the E and I pieces are welded. There is a weld line along one side.

@firefly2472

4 жыл бұрын

@@simontay4851 like with microwave transformers. they are all welded. ( well the ones that i did open)

Yes, thís teaches a real new lesson. This primary number-of-turns-calculation was usefull ánd rather new, that we are glad to learn from you, great Scott. So... Thanx for making this video!

You are the best in the projects. The second Einstein

I want you to know you are the reason I understand and enjoy electrical engineering!

4:45 the song name is "Home Stretch" by Gunnar Olsen for those who are wondering. Its really hard to find in the KZread music library...

Should have called this one "DIY or DIY: transformers"

@klausbrinck2137

4 жыл бұрын

The Best !!! :-)

@sonicunleashedfan124

4 жыл бұрын

Or DIY or 3DP

@davey2k12

4 жыл бұрын

He only printing the core so shud be called DIY transformer core lol

@redpheonix1000

4 жыл бұрын

DIY or BUY, you mean? :P

I'm a soon to be graduate electric engineer, with specialization in power transmition. Must of the time i have to pause the video, think about what he just said, diggest it, and then continue. Jajajaja. Eventually i just go back and rewatch it. Love the vids, always learning something. Greetings from Venezuela.

So many answers to questions that have bugged me for a long time. Thank you!

@greatscottlab

4 жыл бұрын

You're welcome :-)

Great video Great Scott ! Just like always !

Interesting - I was hesitating on buying a reel of this as a "better than air" substrate in a 3d-printed axial motor, but it appears to give a moderate benefit - Thanks.

@absalomdraconis

4 жыл бұрын

You should consider it a sensor & mechanism material instead: focusing fields onto a sensor, building an armature when you want fairly precise spacing, armatures for "fluxgate compases", passive components for magnetic latches, "programmable magnets", part or all of a filter for Hall effect sensors, part or all of magnetic logic circuits, cores for "magnetic 1-wire" access cards, etc. The stuff's just not particularly fit for motor use, but don't write it off without considering it's other possible uses.

Amazing! So helpful and informative.

Thank you for this video. I have learned transformers through my apprenticeship. Now I'm a Lineman. Never understood transformers to this degree.

I love your channel. Thank you for your work

you gotta watch that "magnetic flux density" that is the key to a successful,.,.i love ur videos!!!!

I did enjoy this video and I always learn something new.

@greatscottlab

4 жыл бұрын

Awesome :-)

I'll see you next time as well GreatScott!

Sorry if you said it and I missed, is your ferromagnetic filament conductive? If it is not conductive, you can build up a more idealistic transformer by directly printing a pair of solid EE core (without making a layered design).

Really, really interesting! 😃 Thanks a lot for this!

Best one!! Awesome,still waiting for DIY toroidal transformer

7:04 those screws were satisfying

for the same behaviour permeability of the core is in charge . great work

Interesting! Due to the high cost of isolation transformers in my part of the world I endeavored to build a 100V to 120V 50Hz isolation transformer using an inexpensive 20A 240V to 120V 60Hz step-down transformer as its basis. While disassembling the xfmr I found out why it was so cheap. It had only one winding (autotransformer design) and used 14 ga aluminum wire which I didn't recognize at first because the wire's coating looked just like copper. The xfmr came apart easily enough but I managed to drop the cheap nylon bobbin two feet onto a rug covered floor and it shattered into a dozen pieces, so now I had to build a bobbin. This I did out of 1.5mm FR4 sheets (basically uncladded PCB stock) and while doing so separated the primary and secondary halves into their own sections and this turned out fantastically. I then looked up as many online transformer calculator sites as I could find, calculated the number of turns I'd need adding taps for 105, 110, 115, 120 and 125 Volts (the original xfmr had a 5-way switch for this purpose), added a few extra turns for good measure, and rewound the core using the original 14 ga aluminum wire. When I was done I had 20 or so turns worth of wire left over but left it off so as to not upset my calculations. I then powered it up... and it worked!... but not at 20A. At best it would give three or four amps while humming badly and it will overheat if I leave it on for more than an hour or so. Not to be deterred, I added a two amp circuit breaker to the output, a temperature controlled fan and a 20uF AC motor capacitor to the secondary for a bit of PF correction and it now will work reliably for several hours, but I dare not leave it on for longer than that. Most of the drop in performance I attribute to the aluminum wire but none of the calculators I found had adjustments for aluminum. The unoptimized 60 Hz core material probably doesn't like being run on 50Hz as well. However, it will serve like this on my electronics bench until I can afford to buy a true isolation transformer or locate a used one.

A very great and informative video

Very interesting experiment and thanks for the info to that german transformer site.

Fantastic topic, minimizing hysterisis and eddy current losses would be a challenging task with normal 3D printers and limited material choices. But of course, it's cheaper to buy prefabricated transformers online :) Great video again!

You know, I had always wondered how one could practically test the flux density value of a transformer/inductor using basic test equipment. Still an amateur at electronics so I learn something from every one of your videos. Thank you for the work you do, I find it very interesting.

@noweare1

4 жыл бұрын

you need to know the magnetic path length and cross sectional area of the core, voltage, frequency and number of turns then you can calculate B. Path length and cross sec area are located in manufacturers data sheets so your all set. Really just pick a B that you want to operate at and calculate the volts/turn.

Rob's web "the unknown transformer" is a handy guide for finding specs on used transformers. Thanks!

Great video thank you. Ps. I always enjoy your videos.

Love your videos! I’ve learned so much from you.

@greatscottlab

3 жыл бұрын

Awesome! Thank you!

Excellent Video, Thanks.

Now I feel really smart for always buying or salvaging all of the transformers I use for my projects 😎 I've always wanted to build one, but it seemed way to complex, guess that feeling was right 😁

As always interesting and yes, I did learn something new 🙂.

amazing project. i like it

Great video. definitely the first ive ever seen of someone making their own transformer. have you done a switch mode power supply yet? it would be interesting to see and you might be able to get a semi functional 3d printed transformer out of it. still a bad idea but it would definitely be interesting to see.

The wire diameter and number of turns were always a mystery to me. this video explained it very well. thanks a lot...

Great as always! Remember that the printed parts doesnt have the oriented grains, as the metal one does. This impacts the mag flux.

@lonewolfeproductionsbyl.v.9447

4 жыл бұрын

I was thinking about that, just couldn't remember the term. As in interesting, and possibly related idea, the 3D printed core has its own form of grain orientation, i.e. the direction in which the filament is printed. Probably doesn't have much effect, but who knows: printing in a pattern that mimics the shape of a magnetic field might have some real effects. Food for thought, anyway

Top noch as always

I built my own 220-12v charger when i was in collage using an old transformer laying around lol. It was very easy, i made another with a 3v, 6v,8v, 12v and 24v output for charging Various batteries

Once again thank you for use full information

@greatscottlab

4 жыл бұрын

You're welcome :-)

great video!

Hi Scott. Extremly interesting. I loved it from start to end. I would love to see you try the same with toroidal transformer. Thank you for all those such interesting experimentation. Regards RJM.

nice tutorial thanks !

Nice video sir.

Keep on going bro, i know you will make it 😊😊😊

Very interesting video! thanks you for your work. Have you considered make a third video with high frequency transformer with ferromagnetic filament core?

at schooll they teached me to use beeswax to reduce, even inhibit noise and noticeable vibration, melt it over the corners and then hit it with a torch, so wax gets into the small empty spaces. Or any heat resistant barnish will sufice, nuts tend to loosen, so its a good measure to avoid or delay those issues. Indistrially they just weld them toogether.

interesting study

I believe the properties of this iron filled PLA are very similar to ferrite which is sintered black iron. It works well in motors as demonstrated by Christoph Laimer in an earlier video series.

You made a nostalgie for me. My first transformer was when I was 8. I have made (with father's help) a semi manual winding machine, making windings turn-touch. Never went to maximum B area, less heat.

@VoidHalo

4 жыл бұрын

lol I made my first transformer last year (when I was 33) out of a nail and some enamel wire. Real sophisticated technology, that. I had 16vac at 60hz on the primary and it wound up melting the insulation on the wire because I forgot to work out how much power the wire could handle. Which at 2mm diameter, wasn't much.

@AttilaAsztalos

4 жыл бұрын

Ah, the (gladly) forgotten joys of packing the core juuuuust a tiny bit too enthusiastically (ie. "trying to put back in every single E/I that came out of it before re-winding") and slicing straight through the plastic and a few of the inner (typically primary) turns...

yeah, 3d printed motor V2 =D

Hmmm.. I've always wondered if you could print transformer materials or anything relating to electric transformers. Nice, now I get to find out!

Great scott! Great video! In the previous days I was working on your DIY soldering station, I need a toroidal transformer . But it is quite a bit EXPENSIVE,when I searched in Amazon india(Actually I am an Indian). So, need DIY TOROIDAL TRANSFORMER

You could have skipped most of the sheets and made it a solid block though. The particles are dispersed so finely that they wouldn't need laminations. Not sure how many microHz you'd gain from that though. Thinner wire and a round bobbin you can spool stuff onto with a drill could work :) Especially for very low current requirements.

@lonewolfeproductionsbyl.v.9447

4 жыл бұрын

I suggested something similar. Also suggested printing the coil former out of the same material

@sto2779

4 жыл бұрын

Isn't printing specifically in sheets prevent current loss due to eddy current? Wouldn't a huge lump of block cause a massive eddy current to occur internally?

@etaaramin9361

Жыл бұрын

@@sto2779 A bit late, but for those wondering about this, the answer is no. The iron particles are suspended in the plastic and not continuous. The only way you're going to get significant eddy currents from that would be to heat sinter the plastic out (using a kiln at several hundred Celsius for some hours).

Every layer of turns should be isolated with special paper/cardboar or kapton tape or at least covered with a layer of clear lacker! The use of paper/cardboard has one more advantage other than isolation - it makes the winding of the next layer easier. Every layer shoud have roughly the same number of turns. If you don't have the right size of wire you can make 2 identical winding and connect them in paralel, OR just lay 2 wires next to each other, thus doubling the cross sectional area.

try the magnetic filament with the white spray paint as isolation between the 3d printed plates.

The limiting factor here is not the maximum flux density of the material. The 3D printed material is basicly iron particles with a lot of non-ferromagnetic stuff (the plastic) in between. The saturation of the individual particles is still the same. The limiting factor here is the high magnetizing current due to the low inductance. This in itself would not be a problem but it causes high resistive losses in the copper windings.

Nice post 👍

I enjoyed that ! :-)

I want to know if this could be used for high frequency isolation xfmrs like for fet drivers or ethernet. Also I wonder if at smps frequencies if it could be used for low power apps like running leds

The ferrous filament composition is much more like the composition a high frequency switching core material; as your experimentation demonstrated. I think you could have better luck printing a solid core for a switching power supply. The ferrous grains isolated by the plastic in the filament would provide the eddy current protection at the higher frequency of the switching power supply.

when go with higher frequency you will need to decrease number of coil turns

5:28 - For the first few hundred turns, I was precise and exact. Then I remembered the wise words of Sweet Brown: *_Ain't Nobody Got Time Fo' Dat!_* 😂

@absalomdraconis

4 жыл бұрын

I'm a little surprised he didn't try to use a fishing-rod reel. Those are commonly available, and do the same winding style.

I have learned alot from your contents sir, please make a video explaining diy High Frequency Ferrite SMPS Transformer. :)

I have been thinking about doing the 3D printed transformer bobbins, especially for custom higher frequency transformers (be it the transformer with built-in inverter driver, or just to handle high voltage), rather than using one that's available, as they're still a little bit harder to find. And 3D printed ferromagnetic transformer core may probably do okay with high frequency, beyond 60 Hz, I gotta actually test it on my 3D printed transformer at some point.

Thanks for doing this now i know how to make my own

@greatscottlab

4 жыл бұрын

You're welcome :-)

Ooooh please Mr. Scott do a gigantic 3D printed SMPS transformer

Test them in High Frequency switching supply.

Do you plan to try this with a ferrite core transformer ? for example, replacing the ferrite core with a 3D printed core to see if it works in a switching power supply

I know you likely don't do requests, but is there any chance you could do a diy or buy of an LCR meter?

thanks that was my school project

Ferromagnetic filament might be good for high frequency and switch mode transformers. Even moreso for RF applications like baluns.

@absalomdraconis

4 жыл бұрын

Maybe, but personally I'd look more at using it for sensor applications. Much like an iron nail, you can use it to focus magnetic fields, but unlike a nail you can trivially form it into any shape that you want.

It works, at high frequency. At low frequency, the impedance a.k.a inductive reactance of the primary winding is too low, because the 3d printed core has very low inductance compared to laminated iron core. As frequency increase, the impedance also increase. xl=2πfL

@sto2779

4 жыл бұрын

So this could be valid for switch mode power supplies at high frequency? If so what frequency are you thinking?

small main transformer always pain to winding manually 😂, high power rating ei core should wound stacked primary and secondary to minimize phase shift, minimize air gap with tighter the core to minimize leakage flux, i usually add more turns primary, to compensate fluctuation main voltage up to 250v.

Can you please make a mains transformer using the Starship Coil design? And let me know what you have to compensate for!

you should try to make a linear induction motor

What about replacing the core of a fly back transformer with a 3d printed one? And also 3d printing an E core box and filling it with iron powder? Like the pla core you printed but with zero infill?

Can you experiment on performance of a 3d printed transformer for a flyback converter, say outputting at most 20 watts from mains? You may take the advantage of power integration tiny switch family for simplicity

It could work on mains if you made a switching circuit to control it 😆 DIY smps with 3D printed transformer.

if you don't have the right wire thickness, you can try "hobbykinging" it, using multiple wires to add up to the correct cross section or slightly more.

@greatscottlab

4 жыл бұрын

Haha that was exactly my idea as well at that time. But since I would not create perfect windings, the voltage of the multiple coils would be slightly different. When connecting them in parallel, it can create a compensation current which can be pretty bad in worst cases. That is why I did not show it in the video.

4:59 it should be mm^2, not just mm. Otherwise really nice video. I like that you do in depth tutorials now. More of this please.

when are you going to reveal your book series??

GREAT 👍 SCOTT - plz make a video on mosfet based CC discharge capacity tester which could extendable to multiple bays. that would be super great,

Yes, i wanna an Optimus Prime.. Haha Sry, I couldn't stop myself.

@greatscottlab

4 жыл бұрын

Don't sweat it ;-)

hii i like the way you explain each and every detail in your videos regarding the experiments or the projects i need help regarding the project based on iot based induction motor control using Arduino board

Do the steel sheets coming with the proper coating already? That ferro printed transformer would probably work fine for a high frequency transformer

Hi Scott, can you make a vedio of diy - wi-fi signal booster ? Thanks

please do a video on high frequency transformer and SMPS