Microwave Oven Transformers Basics
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- Опубликовано: 20 окт 2021
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Exactly what i was looking for, thank you!
Thank you! Just what I was looking for! Just subscribed
i remember i thought they were 12V transformers, secondary was for 120V and primary was for 12V. I never understood why my dad threw away the transformer when our old microwave broke (I was like 12 at the time) and let me keep the rest of the parts from the microwave (i didn't know about the transformer at the time) and later i know why now. to keep me safe lol
the magnetron is also quite stupid to give to a kid
well it depends on wich side you put the 120v in i guess
@@StagnantMizu why though? not like they could even make it work
@@mranon42023 the magnetron itself has some nasty chemicals in it. The ring around the antenna can have two colors: pink or white. if it's pink it is made of mostly aluminum oxide which is kinda harmless, but if it is white it is 99% of the times made out of (mostly) beryllium oxide, and if you scratch or break that ring you can disperse tiny amounts of it in the air, which if inhaled enough it will give you berylliosis (a very bad disease which you definitely don't wanna catch).
Nice video serie with great explanations for beginners, keep going. I remember years ago playing with my first MOT and it would have been awesome if some videos like this existed to explain the basics of these transformers
Thank you! :) That's exactly why I'm making them like this. Step by step, starting at the very beginner level and working to more and more advanced things. If you'd like to help, the best thing you can do is share them. I've got a solid start on the series, but most people don't know it exists yet. I need to build an audience. So please feel free to share them with anyone you like! It really helps, and that's how I make more and better videos. :)
In my "youthful" electric technician days, I repaired a few power transformers in audio equipment. Some of them had a thermal breaker in the primary winding.
If Norm Macdonald and Pee Wee Herman had a child
I always thought Ed Norton and Willy Wonka...
I just wanted to say that that is the cleanest cut that I have ever seen, especially through something like a transformer. Bravo! I did have one question that I didn’t know if you knew the answer to: the filament wire output? If you wanted to use that for something else, could it be used to power a small light as an indicator that they is still charge in the unit and left on to continuously drain until the power is gone?
Awesome I just subscribed and going to watch more vids thanks
yeah i've seen the videos where they overvolt them, doing experiments and the transformers start smoking and eventually burst into flames
Great to see new vids
Thank you! :) There's a LOT more coming!
This has been an excellent series so far. I can’t wait to see more of it
I'm sincerely thankful you're enjoying them. Thanks for watching! :)
The disclaimer!! I was laughing so hard, I had to come back the next day and read it all frame by frame! That is by far the best disclaimer I have ever seen!! I may have to transcribe that and either use it as my email signature and\or a waiver to come into my office (I am a control tech that runs a lab in his office); I can't wait for HR to include it in her written consultation after being reminded she provided me with a written statement that I have to leave my sense of humor at home.
Here's a slower version. ruclips.net/video/f2A2QWMoYj4/видео.html That should make it easier to copy. This was posted to my patreon a while ago just for people like you that pay attention and notice the hundreds of tiny easter eggs. Thanks for watching all the way to the end! :)
@@ChaoticGoodChris Thank you!
I too got a charge out of the disclaimer. On a serious note though, perhaps starting this sort of video with a serious abbreviated version (which of course references the full version at the end), but which might avoid accidental electrocutions and the lawsuits which are coming, would be nice?
I've never thought of sound as efficiency loss.makes sense when you think about it.fascinateing
Wow 😮 thanks I was wondering which one 120v goes to 😊
"Spherical cows" killed me.
One thing on MOTs that I've seen are shunts in between the primary and the secondary/filament windings. I don't understand what they do.
They provide a tiny leakage inductance to give an ever so slight bit of current limiting. This will be covered in an upcoming episode. :)
Never related to someone more than when he said “That took doing!” 😂
If I put 120vac on the primary and have no loads attached to the secondary, how much primary current would I expect to see?
Nice video
Thank you :) I'm sincerely glad you're enjoying them!
What's the gauge wire used in primary winding and how many turns are there in microwave oven transformer
i have a transformer setup for 9v dc using a bridge rectifier. and i cant work out why. when i change the brown and blue primary AC inputs 240v leads over, i get 4.5v dc output
i was expecting there would be no change. any ideas?
So I take it that IF they had a large chunk of steel that the contraption itself would heat up a bunch, and rather quickly, because of the eddy currents then? Not an electrician, just asking.
And, just like all modern ones, made from CCA wire, because using copper is way too expensive. I do not even bother with them any more, they are just part of the steel scrap, unless you know that they are over 20 years old, when the copper is worth stripping out.
I totally agree. As a rule, I hate MOTs. They have a place for some specific applications, but most of the time there's a better way. I had to include them here though, because for most people it's a common point on the path of starting out.
I dont get the middle one, why doesnt it melt it should theoretically hit like 600amps right? 120/3=40x15A=600?
Because the load it's feeding is current limited. The middle one is only connected to the filament in the magnetron.
@@ChaoticGoodChris thanks, but I still do not understand.
Can you series up a couple to get really high voltages or does the insulation break down?
They only output 2kV each. Yes, if you do it right you CAN series them, but it's tricky and not really worth it most of the time. I'm doing a video on exactly this in the near future.
I have tried connecting 2 these transformers in series. Primary windings 180 degrees out of phase in parallel and secondary windings in series. By using this connection you won't set one of the core 2.1kV higher than the primary windings. So you can avoid break down.In microwave oven transformers the secondary winding where it is near the core is directly connected to the core and the farther part of the secondary coil is left float,so if you direct connect 2 MOTs in phase then one of the MOT's core would be pulled up to 2.1kV and break down may happen between that core and the primary winding.
Not sticky, stuck together
Ok, I'm sorry for the stoopid question but I have to ask since you mentioned and my brain wonders about this kind of thing, how did you cut it? It's awesome, intellectually, or as intellectually as is possible for me to get, I knew it was different ratio's of winding wire but I don't think I have ever seen it. Thank you for going to the trouble of doing it. While I am asking daft questions, I take it that the hexagonal wires are for closer packing? Does that, or the different types IE etc make much difference to the output?
Hi Ted! :) I love it when people ask good questions. I cut it with a Milwaukee M12 version of a Sawzall using a fine-toothed short blade. It took a few sacrificial transformers to work out how to do it right. The wire is shaped with this profile in order to save money and maximise the number of turns per unit-volume. MOTs are all about "as cheap as possible". Btw, if you're interested in more of the "behind the scenes" and a ton of other interesting industrial-scale high voltage (I work in power plants and make videos about them), you may want to check out my personal channel here - ruclips.net/user/Physicsduck There's THOUSANDS of videos that cover a lot of things that you're going to be very interested in. :)
Hi Chris, I have a question. I have an older MOT and the windings check out. The primary winding is not quite 1 ohm (.08 ohms) and the secondary is 86 ohms. I was reluctant to hook up the primary to 120v because of the small resistance, I figure doing so would be almost like connecting the 120v wires together. Is it safe to do so with 120v with that low of a resistance? I want to take out the secondary wires, replace it with a few turns of heavy cable, and use it as a spot welder for 18650 batteries. I see lots of videos on YT where they just connect the primary to 120v or 220v in Europe, and it seems to be ok.
You're going to want some manner of current limiting to do this, otherwise you're going to trip breakers or set things on fire.
@@ChaoticGoodChrislearned this the hard way, popped a gfci circuit had to call an electrician and all
Do a build on the liberty engine. The silent one...
Send me a complete set of parts and prints, and I'd be happy to.
@@ChaoticGoodChris ruclips.net/video/3bnwQzsp14A/видео.htmlsi=XQypiSMkLuQY40mQ
ruclips.net/video/CSx5kcwnXwY/видео.html
Hahahahahhaa is the primary 100 turns and the filament three turns?? Did I count right? Is there something significant about why the number of turns are roughly equivalent to the voltage of those two coils?
Exactly, more turns = more volts.
You know too much for your own good.
and have the scars to prove it.
440hz 280v mot ruclips.net/video/Am93aGZHCX8/видео.html
Please don't touch the output lead with your bare hand like that! Running that off 400Hz is pretty cool though, and I love the sound as it comes under load. Step your safety up a notch and you're on the path to interesting things. Though, you may end up as an aircraft electrician.
@@ChaoticGoodChris thanks for the advice, since uploading that video I have upped my safety practises. I now use a plastic rod about 2m in length attached to the hv lead.
Excellent! :) Thank you! I'm very glad to hear that. If you watch the early episode of the HV series on here, I go into detail on making a couple sticks and probes for exactly what you want to do. I cover how to build them, and some tips o how to use them safely. I want you to live long enough to discover new things, do good science, and make the world a better place! :)