Being an electronics engineer I've been playing with induction heaters for years. Even made one that looks like a tennis racket. I shrunk the electronics to fit in the handle. Simply plug this into a cigarette lighter socket of a car and you put a pan on the large bat area and you cook a meal. Works great. It really is not difficult. The trick is doing the other stuff I did to make it ultra efficient and effective. Nicely explained Rob

@mememan2344

7 ай бұрын

Can I guess flyback spike transformer usage?

@bartronicsecurity

7 ай бұрын

@@mememan2344 No. Sorry can't say but it did improve the energy-efficient efficiency to such an extent that I used 1/4 of the energy of what a normal induction cooker used and allowed me to cook meals with a mere 150 watts instead of 600 to 800 watts as used by most induction cookers. That is why I could run it from a cars cigarette lighter socket.

@mememan2344

7 ай бұрын

@@bartronicsecurity well if you ever go into production, hit me up I wanna be first

Thank you for the videos. Your helping me with my awful recovery from complex severe post-traumatic stress disorder. The therapy is absolutely a nightmare. It's about as bad as the trauma itself as you have face it. That sucks and it's my intelligence, creativity, resilience, and agility to introspect along with my instatuable learing capacity which is now my "healthy coping mechanism"! Again thank you Sir and sorry about your own loss. I'm intimate with loss and suffering and I feel for you!

Rob you are a genius teacher. thankyou for all you do to inspire others

please do an entire series on induction heating 👍

I have to tip my hat off to you Robert. The explanation you gave of the working and actual physical electrical machine is just right on fella. This subject is one that a lot of great things can come of it for sure. What gets me is why more things have not used this technology. I look forward to your direction of thought. Run with it fella. You will see some real sweet results. Peace vf

woot woot woot Great topic!

Its interesting to see the frequency change with the RGB fragmentation at 3:51 when it switches to 10× times frequence you can see exactly 10× more fragmentation from the magnetic field.

Dumb question probably, but could a contraption be built using gears that could spin the magnets fast enough (to boil water) using human power?

@AtlasReburdened

7 ай бұрын

Depends on insulation mostly. A fit adult male can produce about 100W continuously, which isn't a whole lot, but as long as whatever you're heating is very well insulated, you can certainly dump enough energy into it over time to get it to 100°C and start boiling the water.

@thekaxmax

7 ай бұрын

the human still needs to put out enough energy/second to heat the water, taking into account the efficiency of the conversion equipment. See above for what was the rest of my comment. :P

You always have great explanations and analogies.

Very good. Material has to be magnetic to glow. ?

I wonder if that would work on cast iron. I have a cast iron griddle but I can't really use it on my cookstove because the gaps between the burners leave cold spots on the griddle. It'd be nice to have something that heats the whole griddle evenly while demagnetizing my credit cards. (grin)

Thanks. Very interesting. Quick ask. Please leave the diagrams up longer. Flashing for a couple of seconds doesn't show us anything unless we scratch around to find and pause them. Might be an idea to include something about Moffett drivers, even if it's just to say we should use them and why.

@Egzoset

3 ай бұрын

5:18 Schematic - Oh please, don't tell me this ain't familiar! Mazzilli's "Royer ZVS" going back to a patent of 1954, hence the sole interest besides being an unfinished prototype since 2019 or so... Searching for some real challenge? Integrate self-protection into the power-stage itself, and why not have a slave interface to synchronize multiple boards so to distribute electrical stress while combining flux power. I totally agree about the temptation for gate-driving, though i'd also comment that the D.C. ZERO Hz state is forbiden, since in IH drivers the flux energy comes from field reversals, essentially: it's all about pulses. So why not control those gate-drivers with adjustable-width down-counters, behaving as timers! Imagine 5 microsecond pulses repeated as series of 20 pulses per train, modulating average power transfer by removing pulses until all that's left is a sync mark, to double as an IH scanner capable of "listening" to the susceptor coupled to the LC resonator... Add a permanent magnet and this should provided the means for an audible transductor, etc. With the option to add "smart" features by software to a slave setup. Etc., etc. Things hardly accessible with our hands tied in the back, contemplating a self-destruct contraption waiting for PSU failures (e.g. where its "protection" resides).

Wow Robert!.......that sink in minging!

Rob, perhaps for completeness it is worth mentioning that eddy currents are a very inefficient way to heat up a piece of metal. In the device you presented eddy currents play a very minor role. Most of the heating is achieved by magnetic domains switching under the influence of fastly changing external magnetic field. So only ferromagnetic samples can be heated efficiently and even them only to the Curie point temperature. It takes a much more complicated induction heater to melt steel or to heat non-ferric metals. Like you video though.

@Egzoset

3 ай бұрын

There are applications other than metal melting...

The tubing should be bent without impeding it to be able to run a coolant through it, such as water.

@101jchristensen

7 ай бұрын

Interesting! Since the coil is only "carrying" the magnetic flux, it doesn't get hot itself, but the radient heat from the sample might exceed the melting point of copper if enough power is applied, so cooling the coil would be needed. So now I'm wondering how flowing a polar molecule (h2o) through the coil will behave? (Not important, just gedankenexperimenting ;)

@sladoeii

7 ай бұрын

@@101jchristensen to create magnetic fields strong enough to do this it requires current values that WILL warm the copper

@jimmaag4274

7 ай бұрын

Water cooling is because of the radiant heat of the billet being heated. Steel melts around 2400 degrees

@graslurch3685

7 ай бұрын

@@101jchristensen Water is pretty much non magnetic, at least for practical purposes. Diamagnetic, to be specific. Running water through the inductor coil is done routinely in the industry, you should take care to insulate the pump.

AND a permanent magnetic field is essentially the external representation of the superconducting, organsied path that the electricity takes around the crystaline structure of the permanent magnet.

Thank you very much...

Robert, since there are many transistors with different specification, which has the most efficient use of electricity that one can buy ??? Thank you for your help Sir. Peace v

Is it possible to make a induction heater 3d printer to melt powdered metal or small granules of metal & have it extrude as part cooled metal through heat resisted nozzle so that it dont drip out & dont just run but holds its form we would need a way to instantly cool the metal like pressured non flamable gas maybe?

Hook this up to a wind turbine and have the spinning magnets heating up the bottom of a well inuatwd sand battery get all that energy into it as heat and during winter use the excess heat to get your home.

Could this be used to heat something like a carbon cloth or graphite powder paint?

Nice video. Thx.

Was the spoon stainless steel? It didn't start melting so I assumed it was. That is interesting, thanks.

Robert, Subject: Concrete Battery ... Could you do a video on building and using a small concrete battery (cement, carbon black, and ??) ?? It would be appreciated.

@janthran

7 ай бұрын

i hate to ruin it but i saw those news articles and looked into it and they're mostly pretty absurdly inefficient because the internal resistance is so high. however i have a cool idea of using carbon black baked into some bread just for smaller scale versions of that

@thekaxmax

7 ай бұрын

you can use anything as a heat battery with the right insulation.

Thank you :)

genial comme toujours, j' en ai fait un petit en 2019 pour chauffer mon réacteur autoclave (biochar pour supercondensateur...) ça prends moins de place que le kiln. malheureusement j'avais mal calculé mon rapport puissance et j'ai claqué le circuit😥😢

@Egzoset

6 ай бұрын

La conception de Mazzilli n'intégrait toujours pas de protection interne à même l'étage de puissance, tandis que la commande des grilles n'a rien d'intelligent depuis 2008~2009 déjà. C'est surprenant de voir tant de soit-disant génies-inventeurs reprendre ce prototype inachevé et ramasser ainsi tant d'éloges, c'en est choquant. Le brevet du Royer ZVS date de 1954, voilà d'où vient sans doute tout l'intérêt...

Silly question i know! Is it possible to make a hollow magnet with a different materiel sealed and enclosed inside?...Just my stupid out the box thinking lol

In the uk to add a wind turbine has all the legislation of msc 001,020 and 006.... A windwall just creating heat to be used by a heat pump. Wouldnt fall under the red tape but , could save us a load of power useage over winter🤔

Thank you Rob! Pretty awrsome video. How about revisiting how to depopulate PCB's and some beginer level DIY electronic projects with all recycled parts?

would the steel still heat up if it's packed inside carbon, or would the carbon absorb the power? If the heat can be focused on the steel, I'm thinking it might be a decent way of case hardening mild steel.

@jimmaag4274

7 ай бұрын

Induction furnaces are routinely used for heat treatment

@thekaxmax

7 ай бұрын

induction coils for forging metal is already a thing.

@graslurch3685

7 ай бұрын

Rather not. Graphite has a low permeability, so the energy will get absorbed by it before getting through to the metal. It is frequency dependent though, so a low frequency like 50/60 Hz would be your friend. But why would you pack your steel in carbon if you want to heat the metal? For surface hardening you would rather choose a high frequency which concentrates on the surface, so you don't heat more of the piece than necessary.

@stevecummins324

7 ай бұрын

@@graslurch3685why? A. for carbon case hardening want a low carbon steel to be very hot next to hot carbon so the carbon start diffusing into the surface of the steel to produce a thin layer of extremely hard but brittle high carbon steel. As bulk of such steel doesn't have the additional carbon it retains the properties of mild steel. Could also add nitride case hardening in similar way, but the chemicals to apply to surface tend to somewhat toxic.

Rob, you made yourself an inductance forge!!! Now you can start making knives!!!!

so how to moderate the heat down to say 18c, to use in something like this (i'm not in UK, and shipping is wasteful)

induction heater can be used to transform 3d printed cogs gears into aluminum cogs

@thekaxmax

7 ай бұрын

plastic to metal? That's alchemy.

One of the (supposedly) easier ways (by video sources), is to just get a inductive cooktop heater, and attach an add on tank circuit to it. One coil as a pick up transformer coil over the cooktop, and a furnace coil for the work area, with it's own collection of tank circuit capacitors. My question would be, can such an arrangement melt gold, and copper in a graphite crucible? The added coil would need to be tubing for water cooling.

@onieyoh9478

7 ай бұрын

You can find videos of people liquifying metal with induction heaters, and also check out microwave crucibles. This probably doesn't answers your question but its at least a start.

@Vibe77Guy

7 ай бұрын

@onieyoh9478 Oh, I've found those. An induction melting setup would lend itself to continuous casting of copper into bars. I am tempted to get a microwave, just for melting reclaimed gold, though. Reclaiming gold from electronics generates quite a bit of copper as a byproduct.

@Vibe77Guy

7 ай бұрын

@@jimmaag4274 Well, that's certainly not true. They work on any material that develops eddy currents.

@Vibe77Guy

7 ай бұрын

@@jimmaag4274 You might want to talk to the manufacturers of copper tubing that use induction furnaces to preheat their copper billets. Now induction cooktops often have a magnetic detector that only works with ferrous materials, and that probably needs to be bypassed. But induction heating itself works really well on graphite crucibles.

@thekaxmax

7 ай бұрын

seeing induction coils are used to heat steel for forge work, and can melt the steel, yes. You just need enough power for the coil.

Why can't the spinning disc with the magnets also incorporate a magnetic or electric switching mechanism thereby simplifying the whole thing?

@thekaxmax

7 ай бұрын

that's adding mechanisms, pretty well the opposite of simplification. :P

Does any inductor have too much voltage or current across the copper coil,is it dangerous??

Offtopic rob but have you done any videos on Microbial Fuel Cells?

Can we touch this copper coil, does it have current, is it dangerous?

VAWT magnets spinning above a copper heat sink. Hot air.

I wonder if that can run a flash tube boiler.

@thekaxmax

7 ай бұрын

yes. But you're better off driving an electric motor directly.

@travismoore7849

7 ай бұрын

@@thekaxmax So it is bad for heating.

@thekaxmax

7 ай бұрын

@@travismoore7849 No, you use the induction heater to heat a radiator plate directly rather than going for the complexity and losses of adding hot water/steam to the process. More efficient, though, is using IR projector heaters--direct heating of surfaces rather than heating air in the room.

So, methinks one could take a ham radio transmitter, send it into a 50 ohm load and "boil some water"

@Egzoset

3 ай бұрын

It happens i got just that, actually called a "micro-wave" and mine is most useful in the kitchen...

I don't think this heater puts out more kw than are put in .... Am i right ?

Be good for a blacksmith. Quickly heat up and shape a piece of metal.

I was just thinking. If I had a bag of sand and a bag of water, if I heated both to 150 degrees F, which one would keep hot longer?

@thekaxmax

7 ай бұрын

Depends on insulation and how much the bag allows convection in the water and how fine the sand is cos of air convection in the sand.

@Vibe77Guy

7 ай бұрын

It takes about 14.43 times more energy to raise water temperature than sand. But sand doesn't boil at 100°C, and that phase change requires even more energy.

@thekaxmax

7 ай бұрын

@@Vibe77Guy but this is 150 F, so phase change isn't in it.

@Vibe77Guy

7 ай бұрын

@@thekaxmax True. So the water would be hotter longer. The benefits of a sand battery are usually seen at much higher temperatures.

@thekaxmax

7 ай бұрын

@@Vibe77Guy depends on conduction speed in the sand, which is affected by air movement. So it it's a sealed bag not a cloth one it'd last longer, plus the grain size will affect it, as will it's composition. Basically, the question is unanswerable without more info. But in general, yes, the water will cool faster.

Thank you, Robert. But rotating magnetic 🧲 is much easier, I think 🤔

so what are these so called heat from fresh air heaters that are all the rage now for heating homes ,how do they work ? and is there something to it or is just hype

@creatingawareness1947

7 ай бұрын

Heating with airco you mean?

@johnjones4825

7 ай бұрын

You could be referring to a heat pump. Works kind of like an air conditioner in reverse. Works really well.

Great video, new subscriber here. :) I would very much like to see you build an induction furnace, if you find it doable and within reason of course, could be a fun way to program some nitinol wire? and use that for something fun?

Excellent! Now I shall heat the methane from the garbage converter to further heat the garbage in the converter. Then I will soon draw the knife that cuts into the sushi that the algae grew a long time ago.

FREE MY ELECTRONS NOW!😂

For information: This schematic diagram is copied by the german patent nr. 35 19 489 / 30.11.1989

@Egzoset

3 ай бұрын

Hello Karl Baum! I've noticed that reference before but was never able to verify it while i certainly wouldn't mind updating my perspective on this particular subject, which to me began with Mazzilli's "Royer ZVS" itself revised the year after by another european named Jörg Rehrmann, in 2010.

Rather than generating the oscilation with a tank circuit, a relaxation oscillators using someekind of negative differental resistance device would seem to be a great way of dumping power quickly into a coil. Charge a large capacitor.and when it exceeds a threshold voltage dump the charge into coil. Yes the relaxation oscillator frequency would need be adjusted to suit coil and part, but that could itself be useful in how focused the heating effect is. Also different materials heat up better at different frequencies

I'm not an engineer so this is just an idea. However, I don't really see this as a mechanism as such if it is simply built into the disc so that it switches on and off (preferably magnetically), as it spins. The speed of the switching equal to the speed of the generation.

is this more efficient than a heating coil? induction heaters are now fighting for market with heat pumps. Why, i cant tell.

0:41 But how is it that in that sea of free flowing electrons actually forms a hard rigid material?

@AtlasReburdened

7 ай бұрын

The free electrons have nothing to do with that. It's the electrons that aren't free, and are shared between adjacent atoms to form molecular bonds that hold everything together.

@mookiemorjax

7 ай бұрын

A solid metal is less solid that you might imagine. A crystalline metal structure is somewhere between a solid and a mesh network. The sea of electrons can be convinced to scoot over to their neighboring atoms in conductive materials by various means and voila, you have a current!

@NwoDispatcher

7 ай бұрын

Protons and neutrons are the rigid material held together by electron valences

He should get a set of plans for those of us who want to build one.

@thekaxmax

7 ай бұрын

get the plans from the same place he got them.

Why not use this to boil water for a steam turbine generator and use a portion of the output to drive the induction circuit after the water begins to boil inside the pressure vessel, the output would be enough to power the induction circuit and still produce output power because of the expansion of the water and the increasing pressure, not getting something from nothing, just capitalizing off of the expansion of the water into steam and tapping a small portion of the output power to continue the reaction while using the rest of the output to do work like charging batteries or just running other stuff. The input would be x, the output would be x + the expansion of water, - friction and losses, or y, y is greater than x, therefore once started from outside input, it could run itself.

@thekaxmax

7 ай бұрын

that's called 'perpetual motion' and can't work.

@jasonburguess

7 ай бұрын

@@thekaxmax no, it's not, perpetual motion require no initial input and has zero friction, and is therefore in violation of the 2nd law of thermodynamics, my idea here requires input energy, allows for friction and capitalizes off of known expansion of water vapor under pressure, it is no more a perpetual motion machine than every steam turbine power plant in existence.

@thekaxmax

7 ай бұрын

@@jasonburguess Nope. All perpetual motion requires is more energy out than put in. No perpetual motion machine has ever made the point that it's frictionless. From your description there's more energy coming out than going in. I suppose that it could be read that you're using waste energy effectively, but that's not how I read that.

@jasonburguess

7 ай бұрын

@thekaxmax water has mass, mass has energy, you are using the energy that is already in the system not getting it from nowhere. It requires about 1kw per hour to heat a liter of water to boil, but the water once boiled can produce 2kw worth of output electricity via a turbine generator set up, take the 1st kw and use it to fuel the input and the output is 1kw minus the friction in the system