How To Make Custom Power Transformers
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- Опубликовано: 2 окт 2024
- Learn how to make your own custom power transformer using a microwave oven transformer. Using the information contained in this video, along with the transformer winding calculator software(Free Download Link Below), you can make just about any power transformer you desire if you have the proper size core/enamel wire. This video is one of the few highly detailed tutorials available online.
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LINK TO FREE TRANSFORMER CALCULATOR SOFTWARE:
www.sklaic.info...
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I counted the primary on several mots and found that they all have 120 turns , kinda cool seeing as how most homes have 120 volts so a 3 turn secondary gives you 3 volts and so on .
I tested a 240V primary and it also gives about 1V per turn.
Interesting
I used to rewind these for 6-10v tube filament supplies, as did a few others in the early 2000s tesla coiling community.
Helpful Tip: There is a simple solution to GREATLY reduce core heating if you did not rewind the heavy gauge (120v)primary winding with much more turns of a thinner gauge wire. Place a 20uF to 50uF OIL FILLED run capacitor in series with the 120v winding! The result is lower current draw on the 120v winding, lower output current, and MUCH cooler core. Give it a try!
By the way,What gauge of wire you use for secondary???I have 2 thick types of copper wire.....I cutted my microwave transformer long ago but never been able to accomplish that project,have my primary coil assembly sitting on shelf and core itself somewhere among other things....By watching your transformer I realized that there more room to add another turns to reach 350 volt,350 volt means 350 turns of wire per approximate 25 -30 layers..So one turn consider as 1 volt...If that particular transformer would work than it would be a perfect part for my power supply project...Question is how hot would secondary and primary goes????Would cooling fans resolve some getting hot problem???As for my plasma welder prototype it would be an life saver option to construct proper transformer,this is the only part that slows me down and prevent to construct housing and add all rest of parts..
electronicsNmore thanks I’ll try it one day
My problem is to convert permanently the inner transformer inside that the green\blue Makita sander has from 220volts to 110 volts which is the current
which is mostly the current power we use on the western part of the world !
Can it be converted inside to a 110v sander with no external step down gadgets
??
Thabks in advanced
alternatly, if one leaving the magnetic shunts in, it will limit the ac current.
My understanding is that the heating is caused by the transformer being saturated which in turn makes it draw much more current. You don't want it saturated. A solution is to add more turns to the primary (120V) winding. I haven't personally tried this, though.
lso those high frequency transformers are also using direct current s well
Do you think 60 vs 50 hz will have that big an influance?
I just uploaded a video to my channel of how a microwave transformer is correctly modified
I have a similar size microwave transformer 240V in. Pain is they welded the mounting plate on the side, covering one of the lamination welds. It is actually rated at 1100 watts.
Grind off the plate spot weld areas.
Thanks that was the plan.
Exactly what i want to do.
Please be careful and never touch the transformer if it’s plugged into outlets ! It will make you un-alive ☠️ and anyo standing next to you as well ! 2500 + - is nothing to take lightly. But if your careful it’s a-lot of fun and entertaining! God bless
I wander how good it would be to take 2 microwave transformers and stick both 120v coils on one core to make a isolation transformer .??
hill billy I thought of that already. :-). It would work, but the "No Load" current draw would be high.
Yes; I heard 8A is typical for no load.
if you dont have small have the right gauge uncover varnish wire for said winding can you use wire of the right gauge but with coving on it?like phone line for ex?
Excellent Video. Thanks for pointing out the vibration detail before the welding makes total sense. Thanks!
sir thank you so much for sharing your talent step by step that microwave transformer ,, but please allow me to asked you something, co'z i want to know how to calculate the turn from primary to secondary and also and what type of gauge copper wire that i like to use it? if i build like what you build, by sharing your talent here i can save my money, i hope you can share with me the sample or basic formula, i'm a poor boy leaving a poor no.1 corrupt country have a good day sir!!!
Thanks for watching! Please refer to the link in the video description area for the transformer calculator.
I was wondering what difference is there if I just take old electric cooktop. Connect 2 end with a wire to burn some red hot wire
Is microwave mod any different then electric cook top ?
Both is capable to deliver high amp?? Or not?
Ok first thing. The transformer calculator ONLY WORKS IN 32 bit WINDOWS! But anyways I know the formulas and can do them in my head or on paper..
I have a 120 / 240 step transformer that is rated at 600 watts and has its protective covers and a handle on it. We use it to plug in EU type radio battery chargers from the US mains sockets. It does work both ways also.
Somewhere I have a multi-tap "BIG BOY" that takes 120 VAC and steps it up to 208/220/240/280/360 and 440 volts. He's a big heavy "E/I" core one. It's not something I use all the time so I think its out in my storage room ATM
Aight, I'm looking to get 32000v and 30mA out of one of these. I plan on winding my own secondary of 28 gauge wire. Can you give me a rough estimate of turn number? Oh, a side note I will have a full bridge rectifier feeding it so it will be pulsed DC.
Never happen. Not with this transformer.
@@electronicsNmore I mean as a step up transformer? Do you mean the core won't handle it or that 28 gauge wire won't work? Could you give me some pointers?
when a current from a solar panel is pulsed (turned on and off), on a transformer , you get A.C. All inverters do is pulse small transformers that step up current into another larger transformer. The larger the transformer , the more stronger the magnetic field (electric field) becomes. The long length of wire will increase voltage and magnet strength. The diameter of the wire determines the amplitude. Go thru your house and write down how much volts and amps you use on each item. This is your Total max power consumption when all are working at the same time. Remember , you don,t use all these items at once and some of them (like the refrigerator) turn on by themselves. Add the totals of volts., then add the totals of amps. This is the numbers you need to know when making your own transformer to power your home on solar power. Remember you need a (Properly placed ground) not attached to transformer output. This is an iron pipe driven into the ground 3 feet or more with a thick diameter wire attached to it on top, this is your positive. A wire coming off of transformer (the white wire) or neutral wire. (center tap wire) this is the wire that switches poles. The Black wire is the Negative. Use green for ground, black for negative and white for neutral when you make your own transformer, so don,t get confused and learn how to make a transformer. Larger transformers have higher magnetic strengths in the cores. The higher the core strength (magnet strength) in the transformer (when puled) , the higher the output. Do not use battery positive as ground. Use the earth ground, for ground. output wires are the wires comming off of the end transformer and earth ground. Use these wires to power your home. EXAMPLE: , (TRY) the use of a 10 gauge magnet wire primary with about 600 turns and secondary of even larger wire, 12 to 20 turns connected to a 12 volt power source that is pulsed into this transformer. The makeup of your transformer may be different because we all don,t use the same amounts of electricity. I don,t know if anyone makes an iron core this large or not. You may have to make the plates yourself. EXAMPLE: IF your house uses 8,000 watts. You need a transformer (when pulsed) that puts out 400 volts with 20 amps to equal 8,000 watts. 10 gauge wire wrapped 425 turns primary and you will have to work on the secondary wraps to get the right amperage correct. See transformer chart.
Thanks for replying.
In the world of Brushless DC Motors, the laminations are all electrically insulated one from the other. The best situation from a "core losses" perspective is, I believe, thin electrically insulated laminations are best. If the core is electrically solid, I would think that you are trading some of the eddy current losses for ease of assembly. I'm pretty sure that laminated toroid cores are insultated one from another, but I've been wrong before! :)
Take care,
Nitrous
Great information! I have one question - how did you keep the welding sparks from getting on the windings and damaging the insulation?
You shield the windings with a metal plate of other shield,
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60 volts 42hz input,primery,,,how much can i do on secondary ,,,need help,,step up volts power,
Use the software.
I watched your video and cut the secondary winding hammer it out. Took me a long long time. Because I don't have grinder or welder to put it back.
Next is to wind thicker bare copper wire. I bought some ground bare wire. Would like to tripple or quad the ground wire for a thicker copper cross section area.
What term do I search for the winding calculator?
How would you insulate bare copper wire? And how think insulation need be to not conduct electricity?
NO! You don't use bare wire! You use enamel covered wire(Magnet Wire).
When you stepped down the 240v to 120v....did you just plug it in the reverse direction?
(240v secondary coils to outlet & 120v primary coils as output)
Hi there. You supply 240V to the winding I made to replace the 2KV winding, and you get 120V out of the other winding..
Ok :D thanks :D
I found your video by accident whilst looking for something else. I'm glad I did!
Thanks for the clarity of your explanation. I live in the UK where the rms line voltage is around 230V at 50Hz. The principles behind your video can, however, easily be modified.
Thanks again for this most informative video.
Thanks for watching AJ! Please share my channel with others, and rate Thumbs Up.
Ive never understood how come welding the core like that doesnt muck up the core like a shorted turn?
I don't think it is the same 'conduction' issue like a coil - just a small fraction of the surface of the core is conducting - but I agree it's worth looking into since MOT's are notorious for being noisy and they stand alone in that they are welded and not E and I's interleaved like most others
How did you open the transformer when the sheets are alternate stacked and glued? I spent all day trying to open it up...
Not glued. You simply cut the welds.
In file MOTs are common in todays cheap microwaves, I think they quit doing alternating "E/I" cores in MOTs back some time ago to increase production.
I have some MOTs from the late 70' and 80's that are alternating "E/I" cores and are noticeably bigger and rated for higher wattages (1000 watts). these make the best low voltage high current welders too. they are easy to re-wind IF your careful with a chisel to cut the secondary out.
Hi Love your vids keep up the good work!!!
I'm trying to make an isolating transformer 1-1
It's 2x 240v class 220 mot's, I've cut them and removed both primary windings intact I've also saved the shunts from the middle wasn't sure if they will have to go back in?
My plan was to fit the 2 primary's back onto one transformer and weld it up again BUT!
is the direction of the windings important as I wanted the 240v in on one side and the 240v out on the opposite side but it's very confusing trying to figure out what way round the windings are running?
Any help is much appreciated
Cheers from Scotland
Chris
Great video, thanks! I'm just looking to make a 1:1 isolation transformer so this should be fairly straightforward
Glad I could help! Be sure to look over my extensive video playlists below for many other videos of interest to you, and most importantly take one minute to share a link to my channel with others on social networking sites. Thank you!
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i have a 230 volt 60hz 5.7 amps class B electric motor water pump, and i wanted to use your tutorial here to alter my 420v 60hz oap microwave transformer to power the motor from a wall outlet. Is the transofrmer all i need or will i need a capacitor in between? i was under the impression you should never run a transformer (step up or down) directly from a wall socket.
thank you for any advice your willing to give.
James
When you plug in a power adapter into a wall receptacle, you are most likely plugging in a power transformer. You need to measure the core area of the transformer, then enter the primary winding supply voltage as 120V, Then enter the secondary winding output as 230V / 5700mA. If the core area is large enough, you will get the exact wire you need, and turns. No capacitor!
Thanks For Watching!
Brilliantl, very useful video - thanks for your time and sharing your knowledge
Your welcome! Please be sure to rate "Thumbs Up", share with others, and check out my other videos as well.
does that noise you mention will affect my audio amplifier running at 110V ?. Im trying to run my amplifier with this transformer because the grid supply is 220V
What noise? Been a while since I made this video.
text on the top at 11:27
Very interesting demonstration,However is it possible to make a winding to reach 350 volt instead????And reach secondary current 5 Amperes???This would be exact transformer I seeking,it seems more smaller and much better better sized than original maybe 70's or 80's design which consist of C core and weight near 45 pounds...
The transformer would need to be much larger. Use the calculator provided in the video description area.
Software not work on windows 7 64 bit....Besides,how about use so called inverter or bipolar transistor???Many mig welders have that component and decreased unwanted heavy weight....So transformer is smaller but voltage float is high,wonder if current could be increased as well??Is anyone ever thought about bipolar transistors before???Wonder if they can fix a voltage limitation magic for me??
Could autotransformer be used for welding??
I just check something that I should check long ago,The transformer I was look for is unnecessary,only thing I wonder how to add 50 more extra volt toward existing transformer output without modifying any coils...I realized that I have transformer rated 250 volt and it rated 5 amperes,adding 50 more volt or perhaps 100 more volt would solve all problems..I like it's size and it would be great choice for plasma machine primary torch power reactor,the Multiplaz 3500 is sucks more than I even thought previously,it uses 170 volt for torch ignition and nearly reach 2.5 amperes..No wonder why Multiplaz 3500 doesn't do a job in cutting or welding,plus there is no transformer inside Multiplaz 3500 which was shocked me completely when one person upload internals of Multiplaz 3500 power supply..There is only 2 IGBT transistors which regulate voltage but no step down transformers or any induction coils eather...The machine have 5 PCB circuit boards and looks like a damn computer rather as welding machine...
When I turned on my transformer it showed me on multimeter 250 volt and 5.3 Amperes current,just wonder if something extra could be added to reach extra 50 or perhaps 100 more volts without transformer modifications??If this puzzle would be solved than I would continue on my plasma machine power supply assembly...Now secondary transformer requires for welding,I need transformer for arcing to work as tig or mig mode,however plasma arc melts the feeding wire..It says that plasma torch must be kept away from secondary power source about 3-4mm away from weldable parts...So I stancor P8689 autotransformer as primary torch transformer and Secondary Loyje 120 to 220 autotransformer 4.5 amperes....
What's the no load core losses?
There are definitely losses it's running fully saturated
@@electronicsNmore Could you please measure them. I need to know if a modified MOT will be efficiënt enough for a project, or I need to buy a toroidal transformer
I rewired a MOT after watching this video about 18 months ago and just picked it up again tonight. I rewired it with insulated awg 10 wire with about 16 or 17 turns. I attached an old lamp cord to the primary inputs and attached my meter to the 2 ends of the 10 gauge wire. When I plugged it in my meter says 14 vac and it is making a buzzing noise...any ideas? It is a YEC 120V 60HZ. Any help would be greatly appreciated! Thx
A buzzing noise is common.
@robrat5162 New link is up
+electronicsNmore I've heard that cutting the core open is a bad idea: true/false if I can weld it back together?
I would not call it a bad idea, nor would I call it a great idea. If you carefully cut the old shallow weld, and weld it back together all lined up using a similar shallow weld, you will be just fine. You may lose some efficiency, but nothing major.
Thanks For Watching!
+Sarah Szabo actualy you dont even have to weld it back together , i currently have such a device and it does not matter because its magnetism thats important not current . im not saying current doesnt flow threw the core but i think its undesired so any thing that can stop eddy currents as they are called is said to be a good thing
NOBOX7
Yeah, I welded it together a while back and have been using it since, it's pretty quiet. Seems fine!
Cool video. If i'm not completely mistaken, the reason that the 120V primary runs rather hot, is that the amount of copper and iron in the transformer is very low, to save on materials and weight. They usually push 700-1000 Watts trough a core like that, but it needs forced air cooling and low duty cycle to survive.
That is correct. This transformer is not intended for continuous use using the primary winding as it was, but microwave ovens are designed to operate non-stop for well over an hour at full power. The cooling fan in the microwave oven is usually "NEAR" the transformer, but not exactly right next to it. This transformer, as I stated in the video, will be enclosed in a housing with a fan from a microwave oven. In addition, I intend on using the transformer primarily to step down, and when I go from 240v to 120v, there is no heating problem like the heavy gauge primary.
Thanks For watching.
Laharl Krichevskoy Like I said, if you use the transformer to go from 120v to 240V, then using a moderate to heavy load will keep the winding temp cooler, but for going from 240V to 120V, I used 500 watts for a few minutes and the winding did not get hot, only warm. In that case, no fan is needed. I will still be adding a microwave oven fan. I made a desk fan from one(in my video list), and the amount of cooling is incredible. CPU cooler is not necessary. If you are that concerned, then I would suggest you rewind the primary with smaller gauge wire with more turns. The issue would be gone.
I realize that...you mention it in your video. I'm referring to the output. If 120 is going in and I'm rewiring it as a step up I would like something higher than 120 coming out the other end...preferably 240-250 as was the purpose of your video. What do you think went wrong with my procedure? 10 gauge wiring and 16-18 turns should've done something. Thx
Kevin Anderson You made a Step-Down transformer, not a Step-Up. This video explained everything very well.
Ahhh...so, if I add a bridge rectifier and convert the output (14 vac ) to vdc then add a couple of leads coming off the rectifier then I've made a 12v battery charger?
Yes, the output should be around 20VDC.
nice video. I'm wondering about the trade off you are making by welding the laminations together (Not that it wasn't the original trade off made by the manufacturer)
I'm not a big transformer guy but know that in BLDC motors the laminations are insulated one from the other to help reduce eddy currents. Is this a problem with welding the core together?
nitrous dude Hi there. All the laminations are touching, not insulated. The currents flow through each piece. Welding the core back together is fine because you are not going that deep into the core.
Thanks For Watching
1:55 exactly what I want to about thanks
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dear sir when i was removing secondary winding of mot for spot welder i damaged the primary winding of mot,😂 could you tell me how many turns and layers required in primary winding 220v i canot find answer of this on internet plz reply
I'm about to mirror this transformer project exactly and was wondering how much 18 gauge enameled wire was required? If I order a 1lb (200ft) spool will this be enough for the 210 turns that you wound on?
Every transformer is different. I would take a string and wind it around the core to see how many inches you get. Keep in mind, you will need more wire as you move outward winding. Look for an average measurement per turn then multiply the inches for each turn by 210 turns(If that is what you want). Then divide that result by 12 to get how many feet.
Thanks!
electronicsNmore Thanks for the quick reply. I just ground out the welds and took the windings out and measured 8.25" around for the inside turns and 13.25" around for the outside turns for an average of 10.75" or 223 turns from 200 feet of wire so I'll just order a 1 lb spool. Also, if I add the motor run capacitor on the primary to keep the core cooler this reduces the wattage potential of the transformer?
Adding a high enough voltage rated run capacitor in SERIES with the hot lead, will result in reduced power in and out. You can also place the microwave cooling fan close to the MOT inside a housing, it will stay cool at full power. Or you can use the transformer winding software and rewind the primary to save lots of power, but keep the same output.
electronicsNmore I put 120VAC to the small squirrel cage fan that I pulled out of the microwave yesterday and it works perfectly so I be doing that, using the fan instead of rewinding the primary or using the capacitor. The heated laboratory stir plate I need 240VAC for is about the same wattage as the microwave so I figure I need some sort of cooling. Thanks for you help.
Great. Glad to hear it worked for you. A cooling fan very close to the transformer inside a housing to pull the air across the transformer, will keep it cool.
How do you guys manage to remove coils intact? Every transformer I dismantled were all stuck for keeps by some sort of resin or whatever.
Sometimes the enamel coating acts like a glue.
Use thinner, just a few drops.
What if you just cut the coil you're taking out, then feed in the new wire, without cutting the core?
I do that when making my 52VDC stick welder(I have a video) or 12V lead acid battery charger.
I didn't understand why the lines of flux decreases with frequency, if we are cutting the lines of flux more quickly(higher F), then surely we would get more output voltage hence suggests more lines of flux not less? Edit: Is it because the lines of flux are wider therefore less dense?
I can explain.
Firstly, there's no literal lines of flux.
Let's take an inductor for an example.
When an inductor is supplied with DC , the current is zero at the beginning but rises over time and eventually becomes constant, limited by resistance of coil & it's called saturation. Inductors store energy in it's magnetic field, and how much it can store is equivalent to the inductance.
In short, the larger the inductance is, the longer it'll take to reach saturation, for the same applied voltage.
Since transformers work on AC where polarity changes every cycle, the inductance of transformer should be large enough so that it doesn't reach anywhere near saturation before the polarity changes. So As the frequency gets lower, the time interval between polarity changes increase, so does the required inductance. That's why for the same power level, 60hz transformer is 20% smaller than 50hz one.
@@swapnilkumar9363 Good explanation I'm experimenting with taking two little MOT's and putting them in series - keeping each at 60 volts or so - I've noticed with my current meters that the current is super low until about 80 volts and then rises - to get my 2400 V I'll just put those in series as well - that way you are farther down the BH Curve - so for 50 Hz you could do something similar to avoid saturation any ideas on plausibility ?
@@TotalFreedomTTT-pk9stfor running 60hz stuff on 50hz you have to drop the voltage down to 83% of it's rated voltage, that means 120v 60hz transformer can be safely operated at 100v 50hz.
Also MOT are made to run very close to saturation where core losses are much higher, so it's better to increase primary turns by 25-30%
@@swapnilkumar9363 Thanx for the super fast reply - I've noticed these 'smaller' MOT"s are very quiet up to around 80 or 90 volts - - do you by chance have any knowledge of Pole Transformers ? more specifically the high voltage coil inductance ? these MOT's Inductances are measuring 18 to 20 plus Henry's but I can't find data on Pole Transformers - even the Patents are not giving me numbers - thanx again
@@TotalFreedomTTT-pk9st i do not know the exact values but inductance of a good transformer at no load is just enough that when energized, the transformer has zero power factor.
Hi
Does this approach work for DC as well? Could a transformer be made for 24v to 12v step down? And does the calculator software apply to DC power? Thanks by the way. Love the recycling.
Nels Wight DC cannot be transformed unless it is pulsed. Alternating Current is required.
Thanks For Watching!
Nels Wight DC power can be controlled by the pulses previously mentioned. What you use is a speed controller/motor controller and it estimates the voltage, so for example 24V in would be changed to 12V out by rapidly turning the power on and off half the time.
Your better off doing this in AC then use rectification circuit after it to get you DC..
"A travel transformer [...]"
Yeah, sure, let me throw that in my backpack. 😀
Sorry bud you getting wrong information, transformer will work perfect in range of 50hz if its rated 60hz, transformer will heat up if the magnetization and demagnetization happens to fast do to material used in the core, because it is alternating current in the core will be induced hysteresis loses which determines how fast the core can be magnetized and demagnetized, and if you read about magnetic flux density you will understand that there is nothing to to about magnetic lines and heat. heat induced is determined by Eddy currents and Hysteresis loses. thanks hope it helps.
I was thinking the same thing, but hysteresis losses are a product of both the frequency and the magnetization level. He might have a point that transformers intended to run on 60Hz will saturate earlier than the ones intended for 50Hz (if driven from a 50Hz source), and that although the frequency is lower, the combined effect results in a greater hysteresis loss.
I'm really just guessing though.
+Arvis L
If a transformer is rated 50/60hz, then sure, you can use it for either frequency. If the transformer is rated 60hz, and you use it at 50hz using the same voltage, the transformer WILL run hotter. I tested it myself. There is plenty of info online that you can read which backs what I claim.
Thanks.
Hi, maybe I am wrong. l am so confident about it because I studied for higher national diploma in electrical engineering and in subject machine principles it describes all of it. but if you confirm it in practice so must be right, ok, have a good day bud.
yes, in practice trumps theory. "Building towering foresight isn't anything at all". R.E.M. band.
It s Over flux
How many turns has the primary coil has to receive 120 Volts?
+Najadahe Davila
Hello. Use the link to the software in the video description area.
Nice work. I especially like your corn flakes transformer bobbin - very neatly done :) Great hint on derating MOTS too - they will never supply the actual wattage stamped on the transformer (unless you don't want them to last very long) :)
dash8brj Thank You!
if any of you get your hands on a mot or a chance to get one you better keep it because they dont use this kinda power source any more , and if you over load the new units they burn up .
+NOBOX7
You're correct. Many newer microwave ovens use inverter boards.
electronicsNmore thanks for the input
It's 2023 and I'm still dragging home Microwave Ovens from the tree lawns and yes - they are still MOT's - only a couple of Invertor / IGBT's (which are interesting in of themselves) - so maybe the Invertor's are not working out ? I grab them for the reasons you pointed out - also smash open a TV / Monitor Tube to get the permalloy inside but now NO monitors out there anymore ! so I've learned to much to late - also also that pewter colored metal around the magnetron I think is also permalloy since I leave it in the rain and no rust - food for thought
Great video that is much appreciated! I have some questions if I may:
1. What would happen if the top part (the "I" shaped part of the core which you placed the wood on) is not put on and you run the transformer?
2. What happens if it is still not welded and you place something heavy on the top but not very heavy which allows some vibration?
3. Does it matter whether the primary coil is on top or bottom?
4. Does it matter if the primary coil is placed up side down?
1: the plates would burst out to the sides and the transformer eould not work
2: it would make a ton of sound but would work just fine
3:No.
4:it does not matter if its upside down or not
Hello, Sir. Do you know where can I buy online the laminations/sheets for the core?
Thank you in advance.
No, better off looking inside scrap electronics.
ok you said you went thicker on the secondary but 17-18 is not thicker then 14 and a lot of stuff you said is fake
cool,thank you for the quick replys and for a great video
thank you for explaining everything in detail it helped me understand this so much more
Glad it was helpful Shane! Be sure to look over my extensive video playlists below for many other videos of interest to you, and most importantly take one minute to share a link to my channel with others on social networking sites. Thank you
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Ahh
So the core vibrates if not welded.
Thanks for sharing
Thanks for watching Joe! Be sure to look over my video playlists below for many other videos of interest to you, and most importantly take one minute to share a link to my channel with others on social networking sites.
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Do you know where I can get laminations and materials to wind on?
+Putins Cat
Find a microwave oven that was thrown in the trash. You can buy enamel/magnet wire on Ebay.
electronicsNmore Without dumpster diving, any ideas on companies that sell these things?
Putins Cat
Try your local appliance repair shop. Ask if they have anything getting tossed out. They may sell it to you for a cheap price.
hey Putins cat. Can get everything you need from ascocomponents.co.uk
Do you sell them? I need a few!
No. I only show others how to make them. Thanks for watching!
Wouldn’t both outputs be hot and u would have to tap in the center for neutral?
This is extremely helpful! I have been trying to figure this out for a WHILE now. Is there any way I can do the calculations that the program does without using the program? The program appears to be obsolete :(
You should still be able to use the program
maybe not the most graceful and you can possibly damage it.....but you can knock off those welds with a hammer as well if u knock it right....say it somwhere on eBay here and tried it myself...and it worked! However they put epoxy all over the coils so it was too difficult to modify.
+MAN CAVE NO.1
Hi there. No way will you separate a welded core by hitting it with a hammer, if anything, you will damage/deform the laminations. I would like to see you make a video showing that.
electronicsNmore well I did just that. It wasn't easy but it happened. When I first got the transformer out I was really bummed because I thought there's no way I would get through it but I did it exactly like that I slammed it several times really hard and eventually it loosened.....you don't have to believe it but I suppose I could do a video someday..... Or maybe you can do a video showing how it can't be done. :-) Cheers
*****
If it did work, the weld must have been poorly done or extremely shallow.
I suppose...but it looked exactly the same. Weld along both sides. I think I still have the transformer or the pieces to it. I could show that...it's clear that it was not separated with a grinder. And I would say that most of them are not built so sturdily. Mass produced and only need to last 5 years or so...would save a lot of welding rods that way...
I got the idea from COOL DUDE CLEM when I told him I had one...he just told me to knock it with a hammer like hell....so you could also ask him about it. I think he's worked off most of his that way.
couldnt you just add resistors where necessary and not do anything else
No
Sir it's possible make it for amplifier 35v 0 35v or 50v 0 50v
Yes, you can make a center tapped transformer.
Thanks for reply but which wire g should to use for secondary and how many turn per volt
I noticed the rusty laminates...I have a choke in a guitar amp, and it was in a sorry state, so I cleaned all the laminates individually, but they all had a thin layer of laquer or varnish on. Surely I need to replace that before reassembling, right? I thought the plates were supposed to be separated or they'd just kinda act like one lump and they'd get hotter? But I've been Googling for like an hour and can't seem to find anything about it. I think the whole belief that they need to be separated, comes from having seen what looks like laquer between the plates of that one choke. I either made a bunch of assumptions from there, that warped in my mind into actual vague memories of something I once read, or a fragment of a dream ended up in the wrong place. I dunno.
I have microwave transformer and i need 12v 40A power supply for continuous operation, but my transformer heats up in matter of seconds, how i can reduce input current but keep 500W output power, for example idle current should be less than 500mA but it draws 5A without load at 230v
One idea already suggested is take a Run Capacitor (AC) and put it in series with your low turn primary - this however will simply limit the input current - another idea is use two MOT's in series on the primary side - this will cut each voltage in half - so put 120v into both - each will 'see' 60 volts and now you are much farther down the BH Curve below saturation - okay ? now on the 2ndary side - you want 12v 40A - so you will wind same 12 turns on each MOT but now connect those in series as well since each 12 turns will only be 6 volts (since that MOT is only getting 60 volts) - will you get that much current ? 40 amps ? probably not but I don't that - but your MOT"s should be much quieter and cooler - food for thought - and I am doing that as we speak so ask me later I'll tell you how it works
Hello,can u replicate floyd sweet VTA solid state?
Bitte den hohen Magnetisierungsstrom von etwa 3,4 A bei diesem Kernmaterial beachten!!! Und das im Leerlauf!!! Macht ganz schnell den Akku leer plus Erwärmung.
Grate job 👍😊. however, I can't see the link .
Does it matter which way you wind The Wire?
Only if you plan on connecting 2 identical transformers in series or parallel.
I have done the transformers with the alternating E and I s they are a pain in the ass to do I agree with u
Would be nice t see how you cut, solder, and the more important how you take out the coils... i have tried this before and was impossible without damage the coils. how you did these steps? thanks
Hello. You CUT the weld using a cut-off wheel, hacksaw, or grind it away. I have another video showing how to take one apart. You weld the core back, NOT solder it. Thanks!
cutting the core is easy. I have got problems to take out the coils. They are to tight. how have you done it?
Very carefully pry the winding out. Some can be troublesome, others easy.
ok thanks!
The transformer software installer says it is not compatible with 64 bit versions of windows.... how else can I do the wattage calculations?
If using Windows 7 professional, ultimate, or enterprise, then you can use Windows XP mode to run older programs.
i am trying to get around 60-90kv. i have a microwave transformer. i think that a cockroft walton multiplier wont work because it needs too many stages. does anyone have any suggestions please? i also have a flyback transformer, but it outputs dc (i cant remove the rectifier circuit from it so i cant use it, i dont think). any ideas would be really really appreciated!
Well - think about running some in series - 4 Mots in series would give you 8000 volts - but then everything insulative starts to break down - you are in big boy land already with MOT"s but now you are in stuff jumping out to say hello from a distance - be careful - I think also look into high frequency Tesla coil stuff - because the frequency is high the skin depth penetration is super lower meaning the current does not travel up the arm through the heart - and kill you... as easily
I VE BEEN WORKING THIS VERY PROCESS, USING A SOLAR ARRAY........ IVE, WITH A LITTLE TWEEKS HAVE ALL BUT DONE AWAY W MY ELECTRIC BILL!!!!! I PAY $26.00 A MONTH, WHICH IS MIN. RATE JUST TO MAINTAIN SERVICE W ELECTRIC Co. SPREAD THA WORD BROTHER:):):)
Solar arrays produce DC, transformers require electromagnetic induction from AC to work. In other words you cannot step up or down DC with just a transformer. You need driving circuitry that does nor produce noise and a good pure sine wave otherwise your running a high risk of a house fire from things like motors and such..
Excellent video ....I have a question....when you step down from 240 to 120....the 240 are two hot cables of a 120 v each??....or it is the European one cable at 240???
I use battery is my car 80Ah supply got it
And Converter from power mosfet 15A into up voltage 110-220vac it easy
Neat! Was lately thinking about making a Prius HV battery pack charger to charge the battery as-found with propper connection for a quicker temp restore, versus the individual cells or all the cells removed and packed in parallel using like a hobby charger. This would definitely be an analog part of the solution as-is with potential for switching to create a more optimal pulsed DC with MCU controlled charge curve. Of course will need current limiting and rectification. That might be a super video to show, both the analog and digital range of methods or at least one method.
Wow! Absolutely one of the best videos on the subject. I have been watching videos on high voltage and transformers for about 2 years now. I want to make something cool out of my pile of scavenged trans, caps, tons of big electric motors, etc. I would love to make a insanely powerful fly back but i cant understand how to make the driver. Anyway i learned more in your one video than i have from all the others. Only thing i wish you explained is what exactly makes the transformers different freqencies. What are the physical aspects of a transf9rmer that dictates it as a 50/60, or 50, etc. Is it the thickness of laminate plates that makes up the core? Anyway i dis mot know about all the stuff you explained about ytansformers, thank you and God bless.
Do you still do this, I have 3 I need repaired
How can i make a single core step down transformer .....plz telll diameter of wire....and length of wire to be used ......
Bruh thought he was talking about the toys
Impedance matching for any application.
If you can isolate the primary winding the find the voltage per turn you are away.
I have been taking the cores and winding them as inductors. So many odd transformers on hand .
The term "Power Transformer" is wrong. The power transformer is the transformer that is between the generation and the distribution, and the video's one is for low voltage.
The term is correct. If I stated, "Utility Power Transformer", then you would be correct. You can perform a simple search for "Power Transformer" at Mouser as well as many other big websites and you will see transformers like the one shown in this video.
OK so I got a micro hydro turbine puts out between 60 and 80 volts only problem is it puts out like 30 amps, how can I tie it to a mot or anything to get more amps?
how did you take the copper windings out of the core? did you heat it? need to show how to do it. i have been trying but unsuccessful. the glue is the problem.
No heat. After the core was opened up, I kept wiggling, and gently prying the primary winding until it started to lift out. Be careful. You do not want to damage the primary. Use a thin piece of wood or plastic against the coil and pry against that(close to the core). As one side lifts, you have to insert a wedge to keep it from going back down as you pry up the other side. Don't worry about damaging the HV secondary. When they are both removed, you can take a razor blade and clean the core to remove any varnish.
Thanks For Watching!
Very nice work the link to calculate the coil not working for I have windows 10 and i try to find a new software but I'm not lucky so fare can you help me to find a other one thanks
What if connected two secondaries (identical or different ) around the other cores (not the primary core) ? what would be the power efficiency ? then if you connect the secondaries in series or parallel?
So if you had a plasma table you could get silicon steel and cut your own plates, looks like they just ran a tig torch down the sides with out filler
Where the hell do you find EI silicon steel laminations anyway?
Many places online.
@@electronicsNmore I havent found them anywhere but alibaba, and I have no intention of buying 1000 metric tons of them, nor would I ever desire paying $500 in shipping for a one ton pallet of them.
Very good question indeed. I have the same problem. By searching online you end up to finding some companies in China. Many of them do not have the price at their website at all. You need to send email to them to get the price. And when you send email they ask you lots of questions (like where you are, how much a year you want and bla bla bla) which is annoying and somehow strange. And once they understand you don't want hundreds of kilograms they don't cooperate anymore. Some others which have the price on their website, also already have it for a minimum of some hundred kilograms.
So, electronicsNmore, could you elaborate little bit more please?
I don't have welding skills. It is ok to clamp and epoxy the I piece back to the E part?
That is what I am doing as of now - I cut some angle iron pieces with slots cut out and made a base with 3/4 ply - tapped some holes for 5/16" rod and put 4 rods outside the core - then put the angle iron on and clamp down - remember also to sand or emery cloth the core faces - I am on here right now to find out how much induction improves by welding it - evidently the tiny gaps between the steel are super critical so maybe even 'lapping' the I unit to the E unit might be advised
What will happen if I cut two microwave transformers and weld the two E together so I can wound more copper wire inside
Before I'd try that, Id place 2 identical MOT's in parallel or series.
So what happens on the 120v side, when boosting the AC Voltage to 240..? Does it Double the amperage..?
So let's say I went out and built or bought one of these.. But instead it's 3000W, 120Vac to 240Vac for about $119.99
What's happening on the 120Vac side with 240Vac, 2500W, 10.41A on the other end..?
Is 120Vac, 20.83A, 2500 being used on the 120Vac side..?
+Mark II
Power in is "almost" equal to power out. You lose some power in the conversion process, around 10-15%. 120V / 10A input = 1200W, 240V / 5A output = 1200W.
+Mark II
Power in is "almost" equal to power out. You lose some power in the conversion process, around 10-15%. 120V / 10A input = 1200W, 240V / 5A output = 1200W.
electronicsNmore So basically exactly what I said, but instead you used 5A, 10A, &1200W, instead of 2500W, 10A, & 20A. Good stuff, I kinda figured I was right, seeing that I made an Ohm's law calc for Windows in VB.NET, not to mention I made a video explaining the formulas. Good stuff, and great video, keep up the awesome work.
By any chance.. Do you know how to make a Inverter.. 12vdc to 120vac..? I know it needs a transformer to step up the voltage, capacitors, inductors, etc. PSW Inverter.. not a MSW, or even a SW Inverter. Just curious, if not that's cool, maybe in a couple years I'll find the information simplified enough to learn how to make one.. I believe I still need to learn a little more about Capacitors, inductors, etc. etc. despite what I know already.. thanks again.
+Mark II Keep in mind that most household 120V outlet supplies are limited to 15A, but the math is correct with an ideal transformer.
Inverters are a lot harder to make than rectifiers because you need a circuit that controls the output at a very precise and high frequency. Depending on the method you use the AC wave might be of low quality.
something1random23 Thanks for confirming. Much apreciated.
Yes I know bare wire need be insulated. The problem is romax copper insulation is too thick. Can not get enough turn in the available space for the current I want.
So the alternative is to use bare copper wire. And DIY insulation with electrical tape or some sort of heat resistant tape.
But I don't know exactly how much insulation is required.
Great, i have a welder 240 v. But do not have 240 outlets, that transformer could help me
Watch my latest video, the unit I show is ideal.
Transformer windage software not works with windows 64 bit version...
Hi. Is very great information that you provide. As for the Software installation, I having difficulty of installing Transformer Winding Calculator Software. My PC is using WIndows 7 Home Edition 64Bit. Please advise.
lol that is a small microwave transformer the older ones are much bigger
isn't the power loss due to eddy currents big because of the weld that they have on the steel core
What power loss? That surface weld has little effect on the core.
Why the shit were you using alligator clips in the end vid to connect 240 mains to the trans to create 120v??? How did they not bust and catch fire after turning on not 1 but 2 power tools that draw about 1KW each? I smell lies i think, i did notice your cords were well hidden from camera sight....
I guess you don't know too much about wire gauge sizes and current carrying capacity.
@@electronicsNmore why do you think i commented? Your using what looks to be the standard cheap thin alligator cables from ebay. Im just not sure how you managed to draw what 1500-2000 watts (albeit only shortly) over those mains alligators. Just would have thought they should have burnt out
Best one I’ve seen to build one yet
Why would you reweld the end plates after rewinding?? Mots are made cheaply, those two welds increase eddy currents dramatically, because it shorts out all of those, "independant, insulated plates" that should never be electrically connected to any other plates.. When connected by weld, you basically turn the entire core into one iron block !! It would be better to put a thin cardboard strip between E and I core to keep them insulated from each other.. Then they can be glued or taped back together. This will decrease heat losses due to eddy currents. I file the edges after I cut out the weld with an angle grinder, in order get to a clean surface with each layer exposed and no longer touching its neighbor plate on either side.
Incorrect. The welds are SHALLOW. If that was the case, they would not bother welding transformer cores after assembly at the factory. Yes the eddy currents are increased, but not to a level that causes big problems. If you choose to not put the transformer back together the way you found it, then that is up to you.
Well you can always scrub the original core and get a solid core replacement or make one if your that good.