The Amazing Eddy Current
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- Опубліковано 10 лют 2019
- Eddy Current is awesome and awful at the same time! Cherish it!
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Dr. Boaz Almog: Quantum Levitation Video: • Dr. Boaz Almog: Quantu...
By: Mehdi Sadaghdar
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#EddyCurrent #Magnets #Faraday #ElectroBOOM - Наука та технологія
0:12 “But I don’t care about Fluid Dynamics”
_Sir Issac Newton is typing..._
Sir Isaac Newton:You wot m8
He’s dead
Three body proplem! Three body problem! Three body problem!
Dammed this was close.
Andreiva so cool you have reddit!😱🤷🏻♂️🎊
aw thanks mate for that genuine laugh :'D
Regarding the transformer: the eddy voltage is so low that even the iron oxide on the plates is enough resistance to top current from forming. The weld of course has lower resistance but since its pretty much a high resistance iron wire it is not so bad to be worse than leaving the plates loose (because they vibrate like crazy when under load). Still if you hook up a huge load to the transformer and look at that weld with an infrared camera it will indeed "light up". also along the same idea a solid aluminum pipe of the same size and weight will make the magnet fall more slowly than the foil roll.
ayyyy cody! what legend!
Man, cody is always full of interesting information.
I just mentioned that you did something similar on your channel
Yeah. When I put a mot back together without welding the seams again it buzzed like crazy and had a lot of waste in the air gaps.
They also put the welds in low current areas
0:58 the spark was so perilous that even the clock moved 20 seconds forward XD
Confirmed
Because, the magnet jumps to circuit and blows
how did you even notice that
At that point he reached near-light-speeds, and we as the viewer viewing it from the same window didn't feel the time passing differently. But the time for the rest of the universe it flowed normally thus the clock jumped a couple of seconds. No big deal...
@@user-wd1sr3vb3ywhat the heck r u talking about
6:40 "I created a voltmeter... that's drawing 10 Amps" 😆🤣
You're the best! 👍
I learn and I laugh without fail with every upload. Thanks ElectroBoom! 🙏
You'r welcome Jesus!
Hows it going Jesus
Thank you Jesus for creating universe and science, very cool.
WHAT A BLESS TO HAVE YOU HERE JESUS
Jesus Christ Jesus Christ it's Jesus Christ
0:58 even in an experiment not involving high voltages, Mehdi still manages to create an explosion of sparks.
I love it.
So much for being subtle.
Edited in
He time travelled
@MRTracing Plz behave mr 12 year old
And time travels!
6:00
This is my favorite electroboom moment because the way he says “holy shit” is just too funny
This shit is realy holy
Killed me too
Am I the only one who see a gas lighter?
it sounds like the narrator from dota
Had me laughing for days
He started from 10 in the morning, and ended at 11.30 pm,
true legend
How did u know?
That's right, he spent 11 hours straight of filming. That's how that works.
@@reaperbhai5028 the clock in the background
So what? It’s not a race… Rather should listen to what he teaches with jokes.
"I created a voltmeter... that's drawing ten amps."
LOL!
That's called a load tester. They make them for car batteries and such.
@@wouldntyouliketoknow9891 Oh, good call. I was just watching a video recently where someone said you could test a alkalline battery just by hooking it up to a voltmeter and seeing if it's close to 1.5V. A lot of people in the comments admonished that person, saying that you don't really know the health of the battery unless you're checking the voltage while drawing non-negligible current.
@@tom_something There is a ton of science around the seemingly simple thing of telling the state of charge of a battery. Short version is that it depends on the battery chemistry and how you are using the battery. But the guys who did the admonishing spoke too soon. Measuring the battery's open circuit voltage (no load) can tell you a lot about the battery. For an alkaline cell battery, expect 1.59-1.62 volts open circuit on a fresh battery at 100% state of charge at room temperature. If you measure the OCV and its under 1.50 you can tell immediately that the battery is flat without any further testing. But the converse is not true; just because the OCV is good doesn't mean the battery is good. There are various defects it could have that only show up under load, so the second step of testing is to put a non-negligible load on it.
Tom Haflinger an alkaline battery should be checked to see how close to 1.65 v... to check the state of charge.
@@tom_something on alks I just hook a volt meter up and briefly short the battery out , you can see how charged it is by how fast it climbs back up to 1.5 volts.
0:14 😑
😂😂
Shade on the last video... *science rap battle begins*
No love for laminar flow :)))
Ouch
Hey Dustin You might want to make an episode about hydrolics and how NASA deploys it's actuators into space
10:27 just watch the subtitles
[Sheephdi mode] lol
"I created a voltmeter that is drawing 10A" love his enthusiasm🙂👍⚡
I am a level 3 Eddy Current inspector. We use eddy currents to detect cracks in aircraft.
NOICE
NDT inspector?
Along with your current TSA coworker Eddy who detects crack in aircraft.
So you should know, - if, when you drop a copper ring, over a magnet, - it is actually induction, and not eddy currents ! ? ( when you drop magnets through copper ring, it IS eddy's because the ring need not be complete. just a flat plate. - however not so, with a piece of copper wire !!!. Boom123
Can you detect crystalline destruction due to Gallium or Quicksilver or are they too conductive?
The spark at 1:00 caused the clock to jump forward 13 seconds
That would have been cool, but I think it's a cut scene with very good editing.
It probably was, impressive editing, nothing else in the scene moved during that time
@@joshuareynolds5219 there's nothing there to move, except the clock
Sharp eye!
for sure it is not a jump cut i slowed the video down to 2% (downloaded it and checked) it is too perfect to be a cut, even professional movie editors can't do it that well... maybe that shorting lead to some powerful electric field being generated with fiddled with that seconds hand? also not 13 seconds, 12 (from 51 to 02)
Damn , he was making video from 10:30 to 5 . Amazing dedication
0:59 When the explosion happened the clock skipped 10 seconds. Am I the only one who saw this?
yessss
Khant Htet @old blender spotted it a year ago, see comments in chronological order
Yeah now that you point it out he cut the video to make the explosion happen at a better time.
Za warudo
he purposefully gets hurt to entertain us?
I probably would have had better grades if every teacher was as interesting as electroboom
YoU wOuLd HaVe bEtTer GrAdEs iF yOu uSed aUdiBLe.cOm/eLeCTrobOoM
Only if your intelligence is not the limiting factor
If schools were this fun, everyone would be smart, but sadly that isn't the case
@@alvarogabrielaguirregarin3933 Intelligence is just your patience with wading through the boring stuff to get to the good parts.
Is not. Intelligence is the ability to solve new problems based on previous knowledge. What you´re describing is just perseverance and, in most cases, a clear sign of lack of intelligence (trying to get impossible things through persistence).
The larger of the two transformers you showed here is a microwave oven transformer (MOT), which is designed to step mains AC up to around 2000 volts for the magnetron circuit. The pair of welds across all the layers of the MOT core do serve a purpose beyond being structural:
The ground connection for the high voltage side is the MOT core and its mounting plate. The ground terminal of the magnetron is connected to the MOT through the isolation capacitor (to filter out any stray DC) and the metal frame of the microwave itself.
This simplifies wiring a little, since only one high voltage lead needs to go all the way from the MOT to the magnetron. Another function is to ensure that any stray current induced inside the oven itself is immediately grounded. If the layers of the MOT core were not welded together, the induced high voltages would spark or arc between layers, overheating and corroding them.
Oh wow never thought of naughty voltages between the lam''s - thanks for that...
that is fascinating I never knew that I just thought it was a lazy cheap way of keeping the layers from vibrating and making noise
I believe they are both Microwave oven transformers from two different sizes of ovens
@@rogerd4559 No, the small transformer is not from microwave oven.
There is not a big variation between low power at 900 watt and high power at 1200 watts.
By law, 10 amps is the maximum current legal for kitchen appliances running on standard 120 volt plugs.
@@moiquiregardevideo oh good news! that means the several small microwaves all have big transformers in them for my spot welding project
My parents go out to shop
Me alone in home: 2:01
LMFAO
I also connect a coil to a scope and move a magnet through it to see how much voltage it induces :)
I thought only I did that.
5:40 I an only imagine his family's confusion when the lights start dimming lol. Their just like "huh? What's going on?" *looks over* " oh he's just making a video ok" LMAOOOO
1:00 he discovered time machine without him noticing
I don't get it?
yep that only i was looking at
@@deformercr6680 observe the clock behind him
the fbi cant reach him for that
Wtf lol
I could not stop watching the wall clock behind him!
Stop watching it! You may... find out things...
@@ElectroBOOM Take the clock to the waiting room of a hospital MRI department and you will see a pretty cool effect...
**angry joe impression** TWELVE HOURS????
Oh great, now I have to watch the entire thing again!
d1rcwill cool. My. Ass. Had a nice mechanical watch destroyed when I was called into the control room to calm my mum. Nobody told me I had to remove sensitive items before. And me being me I thought that was just when you got to the scanner itself.
6:18
"Is it melted to some extent?"
*_giggles_*
7:39 When girlfriend say yes for hook ups
Turn on subtitles
I never understood superconductor levitation until you explained it like that. Thanks!
Rather astonishing, no?
Mehdi current: the current measured when Mehdi electrocutes himself.
who is Mehdi?
Bruh
Bruh
Excellent video. I have my term 1 exam in a week and I always felt unease in this topic but now due to your funny and engaging way of teaching and demonstrations, I am pretty confident. Thanks
"What is eroti..." - nicely done :p @ 12:07
I would say that the Microwave transformer, being one that works in high power ranges such as 800-1000 watts, creates a loud and noticeable 'humming' noise in the 50/60 Hz range. The MOT is welded together and coated with resin to suppress those humming noises. It is cheaper than clamping and would save space. Naturally the eddy current losses would be higher compared to other laminated iron cores but probably not enough to compensate for the acoustic noises you would get from them otherwise
Also since it connected at a single point I imagine it would limit the loop current. (assuming it is only welded on one side)
Current flowing in would be the same as current flowing out effectively canceling it out.
@@sloth4urluv it's not welded at only one side. And the guy above is right about the noise, my microwave transformer makes a lot of noises when drawing 200 amps at 3 volts, imagine without the welding
I think they are deliberately lossy and is the cheapest way to limit current in the magnetron. Also one end of the secondary is bonded to the core iirc.
@@anullhandle That's exactly the reason it's done; and you're correct, the core is connected to the positive side of the power supply.
isn't the core grounded? what do you mean by it is connected to the positive side of the power supply?
Hello to all Eddies and others! If you have interesting thoughts, I could use some good video ideas! Why not post them to reddit: www.reddit.com/r/electroboom
And also is it possible to reverse engineer the diode configuration that changes ac to dc
6:18 the shorter wire isn't melting exactly because it's shorter. Resistance grows with length of the conductor, isn't it?
wellding the transformer on the edge is not too bad because the magnetic field lineas mostly stay inside the iron core. And since they mostly do not loop around the welld line not much current is induced.
There is acctually some transformers used in audio gear that have an cupper beld soldered around the entair transformer to prevent exes magnetic field exiting the core.
@Mehdi Do these Eddy currents flow to the ground through our body ? Like how do they die if there is a constant source of changing Magnetic fields inducing them ? Can that metal plate be pictured to a source having a series resistance ? #Electroboom .
The Welds don't Affect the transformer that much, The High Current draw is from the design of the transformer primary (Primary Inductance is low). Actually removing the Welds makes the transformer draw 40% more Current and 60% less Efficient power conversion. (I accidentally removed the welds from two Microwave transformers while modifying the transformer and only got 1kv each from 220v).
0:58 brilliant editing. We can just see the clock go 20 seconds forward !
bro you are great
its isnt an edit its just the clock got jumpscared the clock got so scared that the clock go 20 seconds forward lol
Editing, or time travel. You decide. Perhaps we've finally unlocked it.
@@rishyanth-zh9bv proof , the magnet disappeared
I slowed it down to 0.1x and viewed. It's not edited. The needle even shook after hitting "10". Most probably had his clock connected to his circuit or something even though I don't know who uses supply voltage for that 💀.
6:00 The fun begins! XD
Blender Bach the subtitles are even more interesting.
@@bozhanshang342 Yeah 🤣
Well maybe you should care about fluid dynamics! -a specialist in fluid dynamics.
I leave it to my mechanical engineer minions! :D
@@ElectroBOOM But there are only 2 types of engineers! Electrical engineers and those who weren't smart enough to be electrical.
Well you sould care a bit
@@EliteArsenal He's joking
@Markus Wunderlich eddy magic
This is like Demolition Ranch with electricity
Gg man, you are a man of culture
We should find an ElectroBoom version of Creepy Cooter.
I would like this but it’s on 69 so yeahhhhh
Eyy
Hell! Demo Ranch is less brutal XD
I love your work! Thank you so much for your videos, They helped me through college.
OMG I've watched a 100 freaking videos on quantum locking and superconducting materials and still didn't fully understand why they worked! And in this one short video it came to me and makes total sense! I knew about how eddy currents slowed magnets in a tube but I didn't know the relation to superconductors and how it is all about 0 resistance! Thank you so much for being awesome! I learned more in the 12 minutes and 17 seconds of your video than a hundred other long videos! You rock!
@01:00 the short circuit affected the time ! Watch the clock jumping 9 secondes ahead !
It's cut before the short,not that obvious though.
Its 13
@@HiroOnUA-cam it's a joke
You can also see the magnet disappear.
@@harrisoncringeI think the magnet short the circuit 9 seconds after the magnet drop,it's the cut make it look like time jumped forward.
5:36 It's amazing to see how loose turns of coil, cake into a temporary compact coil (while energized they get atracted among them).
Yea I remember seeing the same thing with welders at work. They would have long cords (100+ feet) loosely coiled up. If the cord wasn't pulled out and just coiled up loosely it would tighten the coil when they were welding
Yeah, I "energize" my wife during bed exercise to "tighten the coil"
For scientific purpose of cuz ( ͡° ͜ʖ ͡°)
Yeah, I was the Maintenance mech/welder in a big machine shop...I used to short the leads to mess with guys when they stepped on the cables...@@SupperDadder
yes they melted together nicely
2:10 “to put it simply”
*shows college level equation*
Is it tho? 't was pretty simple to me!
Oh wait I studied that stuff in Uni... Nvm
Its actually taught it highschool final year
@@samless782 no it's not. You won't learn contour integrals in high school. Unless it's an extremely exceptional high school.
@@shayanmoosavi9139 I'm pretty sure we were taught this equation while i was prepping for jee advance.
@@samless782 you mean you studied contour integrals in high school? 😳😳
I'm certain that it's not in the standard curriculum of a high school as it's an advanced topic for high schoolers. You barely learn integrals and all integration techniques in high school let alone contour integrals. Contour integrals are typically taught in calculus II or III depending on the curriculum of of the university.
I was trying to understand eddy currents since one month but by seeing this video i understood it at one go. You are great. Thank you very much.
PhD student in electrical steels here: welding down the side doesn't cause eddy currents to flow through the stack (unless burrs accidentally touch and form micro-welds) From Philip Beckley's Electrical Steels for Rotating Machines :"It takes two short-circuits to complete an eddy current loop, and a weld bead down
the outside of a stator stack amounts to one short-circuit line in what would appear
to be a safe place. However, if burrs formed on the tooth parts of stampings produce
short-circuits then these complement the weld bead current paths and raised losses
are inevitable."
Welds are used to secure the stacks, particularly when they're larger as the glue/coating will have a harder time under increased forces.
Welding both sides of the transformer will result in a complete circuit and power loss and from the ones I've seen they have two welds on each side(4 welds). Some wac-nut thought it would be cooler to weld it than to use conventional means. It also GREATLY increases the difficulty when trying to salvage wire from old transformers. The practice of constructing things like that and also potting are to me the resident evil in modern electronics. Used to be you could salvage practically anything relatively easy, not so anymore.
I'm high and have no idea what you're talking about here, but it was mindblowing so thank you.
would that be why my microwave ovens dont last over 5 years cause the transformers overheat?
every time you put that confetti, a video codec dies
Happens with static bitrates. No video codec can fix that. Only a variable bitrate could prevent that from happening
I really only see the deinterlacing on this video though.
shoutout to tom scott
im tearing... im just so happy and even more in love with physics now...
thank you so much
6:08 llllllook!!
@4:47 i got scared when he said "Watch the ring". I looked at his gold ring at his finger and thought oh no please don't touch your ring with anything. I once heard a story from my prof where someone with a wedding ring tried to fix a pc while it was powered on. He shorted something with his ring, somehow the fuse didn't blow and the ring got really hot. It melted through his finger. I guess he lost that finger. So please Mr. ElectroBOOM take the ring off while doing your experiments.
A concerned fan.
I watched the ring as well, damn b*tch on tv.
Co-worker lost his wedding ring while working on a car battery. He did not lose his finger but needed serious medical attention.
That story of the tech has been floating around for decades. Many who teach computer cert courses use it to keep students from causing shorts and killing the computer. The only place where there is that much voltage current etc is in the power supply even coming off the 12 volt line the current etc is not high enough to heat a wedding ring up to the point where it would be any thing more than uncomfortably hot. You normally wont do much work inside a computer case with it hooked to power other than maybe hooking up a fan lead or a hard drive power cable.
This is why AvE always puts tape around his golden manacle
Computers generally run a 12 - 20 volts on the motherboard. The most this voltage would do is crash/damage the motherboard and leave marks on the ring. It is not high enough current to melt gold. Also, it would have shorted through about 1mm. Therefore it would not melt. I have ran 19v from a laptop charger through a good wire and it did nothing but short the adapter. (Do not try at home.) It certainly did not melt.
7:35 This genuine excitement.
Yes I had the exact same doubt you had on the Transformers welding I think there is a loss in magnetic field due to the eddy current because of welding on the Transformer, the current flows through the area at which the welding has been done so Eddy current is more than previous which means without welding
I just saw 13 hours pass by on the clock behind you... in 12 minutes. Awsome videos, cheers mate😁
Ed, Edd and Eddy current
They're _always_ current
Nahux brrrrruuuuuiii
The three levels
Freddy current
Greeting fellow 90s kid
1:23 When he thinks about normal activities, he thinks about cutting pipes
Please god don't let me be an engineer
the foil example actually helped me solve a question. THANKYOU!!
Oh man, this guy is a legend... I learned the thing clearly and also it is very entertaining...and when an educational video is entertaining..you can say that person is a great teacher..thanks, it really helped
The welding on the MOT makes very little difference to the overall functionality. Think of it like plates of a capacitor - they are all connected at one end (analogous to the plates on the transformer being welded) but it is the surface area that matters.
So long as the grain of the plates is (mostly) parallel to the magnetic field, using plates instead of a solid core only sacrifices a tiny about of efficiency.
also the MOT is only ON for short periods, so high efficiency and no load losses are not that critical
Basically the iron sheets do not form a complete loop of wire.
Think of winding a coil onto the outer legs of the core instead of the middle leg. You would wind it in the same way as on the middle leg.
Since the plates are welded on only one side of each outer leg, but not on the side facing the middle leg, this does not form a loop of wire.
And the welded joint ensures less chances of vibration noises.
What's MOT
@@othusitselokailwe2857 I'm sorry. MOT = Microwave Oven Transformer
Best salesman I didn’t even skip the ad
Haha yea
XD
Thank you very much medhi this video helped me so solve some problems about induction
8:02 Whoiiiii....man he's really enjoying it😂😂😂😂
Yup
1:23 "normal activitie"
*cuts pipe with saw*
I expect to see blood spurting everywhere, the way he is so careless
@@rogerd4559 xD this could happen, but didn't.
That's how you cut pipe, with a saw lol
Sounds pretty normal, at least in DIY land. Not everybody has or knows of a pipe cutter. Some even try scissors or knives, with predictable success.
@@robertmartinu8803 xD wtf
I love hearing a grown man say "Weeeeee!".
MyChannelOnThisSite my Grandpa would say that as he drove his 60ft motorhome down a winding mountain
A good side note on 12:16. This is how an NFC/RFID card (as the second coil), communicates with the nfc reader (first coil) by drawing pulses of current without needing to be powered independently.
08:35 this just looks like magic. Your brain expects the magnet to fall so much faster. I just love it.
8:45 the subtitles literally mention that his mind was blown lol
i wonder why
0:01 Yes. It's the ocean current Nemo's father traveled to Australia with.
😹😹
Dude, he’s trying to be specific here
This guy took more than 6hrs to make a 12min video.
Hats off to his dedication 🙌
Now I see what Mehdication really means.
add all the editing and you'll have way more :)
12 minutes of video and about 11 hours burning fingers, being electrocuted and sucking his fingers.
Great job! My favorite book is Feynman's Lectures on Physics. I like your 'goofy' presentations almost as much as the book. Thanks...
Mehdi, you are in a class all of your own on UA-cam! Thank you for all you do to educate and teach others.
Oh, I know this one because I'm from Australia. There was this kid at my school who liked to do card tricks. He was OK, not great. One day he was doing an outback themed trick using some authentic bush tucker. He said he could make this berry thing disappear using just the playing cards. Well, when he did the trick we all saw what happened, the berry thing just got flicked up on top of a bookcase. Nobody was tall enough to reach it. So it just stayed up there. That was 20 years ago, it's probably still there to this day. Anyway since his name was Ed his nickname was the Amazing Eddy, and so that dried up berry will forever be known as the Amazing Eddy Currant.
Good job, Mehdi. Your videos make me understand a lot of interesting things.
Hey ElectroBoom, I'm trying to build a induction furnace and this video really helped me, I was really confused if my calculations were right. Could you point some stuff about the heat generated by the eddy currents? Cheers!
Who would dislike this?? This guy is incredibly smart!! I’m an electrical engineer recent grad and i watch his videos quite often to help solidify some concepts
I have a chemistry test tomorrow and here i am again learning about electronics...
Same
Lol the story of my life, curiosity is a curse xD
Ha for me too
If you end up taking inorganic chemistry, it is all about electron theory and QM. So, knowing about how electrons behave, won't hurt you.
You only need a C in chemistry to get a good job as an electrical engineer. Like all things ,freshman gen-sci too shall pass.
You make me think every time I watch these. I was always curious if we could use Eddy Currents and Superconductive forces in lock to manipulate gravity but, that seems to be a far stretch that they're still trying to figure out.
6:15 These little chuckles are precious
Forgot to hide the lighter at 6:00, looks like you lit the spool manually :D
True
I just think of it like WWE. Just 'cause you know it's fake doesn't mean you can't enjoy it : )
Nevermind how he got it to light - it stayed lit! That's even worse! Wire is supposed to be flame retardant (for obvious reason). I threw out a batch of OrientalTrading wire once upon a time due to cheap insulation that would melt when trying to solder to the wire and would burn aggressively if ignited.
A good show here, but yes, the whole roll of the red wire would be smokin', and the flame retardant, that's pretty much standard in most countries... @@wouldntyouliketoknow9891
Eddy Currents are also used in non-ferrous metal sorting machines. With strategically placed Eddy Currents in an Eddy Current Separator (ECS) You will filter out metals such as Aluminium, Copper, and Brass creating a mixture of metals called Zorba.
who ever wrote the subtitles i love the 4:56 part: (electroOWL) hooh
5:57 "let me switch to my longer spool, maybe i can run it continuously... HOLY SHIT!!!" *destroys room*
Wait I litterally read your comment as "ruin" it.
You are excited and you look like me teaching electronics at a "medical device repair" lecture at the university. Giving a "way of thinking" to students was the most joyful part for me. Congradulations! You are a good lecturer.
Hahaha I created a voltmeter that’s drawing 10 amp
Phy Belong um
Innovation
Haha
Genius!
I havnt done it but I think if you could float the aluminum tube or suspend it by a string maybe ...it should try to rotate when you drop the magnet. This is how the older watt meter on the house works with aluminum disk. Newer motors in washers use this for spinning. I really liked this video.
You are expressingthings bit funny with shortcircuiting some electrical wires, but you are one of the best teacher I have ever seen. Thank you
I used to come for the laughs, but now I come for the knowledge. Thanks, ElectroBOOM! Greetings from Brazil.
OMG I was waiting for so long for you to upload. Haha Amazing video, informative yet entertaining. As a content creator myself, I highly admire your videos. Keep up the great work.
Good chanel bro
yas
Same
extremely perfect teaching method you developed, 🙏
Anyone notice the time in the clock he has been making videos for hours, a lot of hard work
You know what else is audible? The Ed Edd and Eddy theme song now stuck in your head.
The welds don't affect the transformer because they are only on one side of the exterior side of the arms of the E armature. In an armature the eddy currents are circular and perpendicular to the magnetic field. So to affect the transformer it should also have welds on the interior side of the exterior arms of the armature as well. That will create a curent loop. I'm sorry I'm not very good at explaining stuff. I hope people understand what I'm trying to say.
but my welding machine transformer had those wlds all over it. they literally welled the transformer to the frame of the welder
but it has a movable core so maby that made it acceptable
Eddy current was one of the methods my dad used to inspect aircraft parts during his 20 years in the USAF.
He not only performed NDI, he taught it as well.
Thanks to your teaching style I learnt more about Eddy current from you than I could from any book
#+1 sub
hOW aRe YoU StiLL aLivE
magic
Hey brother
Hax in real life
?
because, knowledge
1:00 How many times did you try this? Turned out great!!!!
Wauw. Fantastic explanation & experimental demos!
In aviation, we actually use Eddy currents for NDIs (non-destructive inspections) on certain parts for cracks or flaws. It's a neat tool, like a box with a wired pen, and you just move it around the part to generate an Eddy current in the part. If there's a crack or flaw in the metal, it will disrupt the Eddy current.
There's some other neat NDIs too. One of them is magnetic particle inspection. You magnetically charge a part, then drop iron powder on it. The iron powder will align to the flux, and we can see disruptions in the flux. These disruptions indicate cracks or defects. Unfortunately the cracks might not show up depending on their orientation relative to the field's poles, so we need to change the pole locations and try again sometimes.
There's also dye penetrant, which is when you spray a dyed penetrant (like WD-40, it gets inside the cracks) then wipe it down. The dyed penetrant stays inside the cracks, while the rest gets wiped up. Then you spray a "revealer," which is like a mix between foam and flour, onto the part. The dye pen in the cracks gets wicked out, revealing red lines in the white spray. There's also florescent versions.
There's ultrasonic inspections, which is like an ultrasound for a plane. X-ray inspections, which is pretty self explanatory. Then there's the "coin tap" test, where you tap certain parts with a coin or special lightweight hammer, and listen to it ring. Depending on how it rings, it might be cracked.
Subbed since the beginning. Keep growing!
An old but common example of eddy current in action were mechanical speedometers, and probably tachometers, too. The flexible shaft from the transmission had a magnet on the end that would spin inside an aluminum cup. The cup had spring like that on a clock escapement to return it to zero, but otherwise just had the needle attached. The faster the magnet rotated, the higher the needle would rise.
Tachometers were never done this way, at least not in any mass manufactured designs. That would have required having a cable coming directly off the engine ahead of the transmission. Even at camshaft speed that would have been some serious RPMS (camshaft speed = 1/2 crankshaft speed, so 2500-3000 RPM on most pushrod engines). Speedometers were able to do this because they had the relatively low speed cable coming off of the transmission tail housing, after the gear reduction, so it was more or less at wheel speed (equal to wheel speed on FWD vehicles, equal to driveshaft speed on RWD vehicles). Tachometers were done with two opposing coils, one fixed and one variable, acting on the needle. Same as fuel gauges. The variable coil was driven off the ignition circuit so that it was active whenever the coil was in dwell. This is effectively a PWM signal since the dwell duration is essentially fixed but the total cycle time gets shorter and shorter as the engine RPMs increase. Of course now days its all done digitally, even if they have actual physical gauges for style. The faux gauges have stepper motors to position them.
@@wouldntyouliketoknow9891 I have a motorcycle whose tach is driven from a cable from the exhaust camshaft. There's a worm gear that reduces the rotation speed of the cable by a few times compared to the camshaft. It's very common for older motorcycles and reliable as long as you keep the cable lubricated.
Yes as the person above stated the electrical connection for the tachometer was commonly run off of the distributor in older vehicles. Now the instrument cluster is itself a self contained computer module receiving packages of data from all the other modules in the vehicle via the controller area network or can lines. This is done so that a module can see what a specific sensor wired to another module is reading without having to be directly wired to it. This is the most common way vehicles are wired today commonly called multiplexing, the only difference is the language they talk to each other with such as iso j1939 or GM-lan. Also the actual sensor that determines the engine’s rpm is the crankshaft position sensor or cam position sensor. Besides informing the ecm what rpm the engine is turning at it also is used to determine where the piston in no. 1 cylinder is which the ecm’s software uses to calculate where the rest are it uses this information to time the fuel injection and or spark if it’s a gasoline engine. The sensor may use inductance, reluctance or may be a Hall effect sensor.
I've got a 73 Corvette, the tach is 'mechanical' driven right from the distributor....I assume it's the same...never thought about it, now I have to find out.
@@wouldntyouliketoknow9891 - there were hand-held mechanical tachs, too. I remember seeing them in a Starrett tool catalog from the 1930s. Not sure how they worked, though.
Enjoying while learning ! Thanks a lot!
7:40 WHEN YOU PASS A CLASS AFTER FAILING 3 TIMES
7:40 The excitement in this man's voice made me smile.
And the great thing is his face never seen so excited when he excited
The subtitles are even more interesting
8:46
My brain exploded. There’s gray matter everywhere!
Look outside your window. It's the same story there.
I tried your experiment with a copper tube and some magnets. It was so cool.
Your videos are different from others as you not only made the topic understand in words but in practical form too...... Always waiting for your new topics videos with experiment.................................keep it up🤐