2209 Switched Flux Generators

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[@billschwandt1]

I'm new to the channel and I'm an inventor. Your videos reassure me everyday that I'm not alone in seeing the picture of electricity I see, even if it's different than most people, and that what I'm doing is worth it.

[@whatelseison8970]

Learning more about the natural world and the forces present therein is always worth it; even if just for its own sake. imho.

[@eskimocommotion4965]

Same here. It's like I see/think/build stuff in my head but don't do much and then I see it in a partial way being used as same as I thought and I'm saddened because I got some really good stuff but idk how to get it out without being a fool and lose it. This idea here I see a spring and bow that gets nudged and moves back and forth more than it's moved and is sustainable

[@billschwandt1]

@@eskimocommotion4965 I know that feeling, the only response I have come up with is ill just keep putting out my drawings and papers and one day someone will read it and see that I have great understanding about this and come ask about it. Opportunities will open up, just gotta have faith brother! Stay 💪

[@liamwinter4512]

Every home should produce it's own power

[@billschwandt1]

@@liamwinter4512 amen, brother.

[@petesfeeder]

So many rotational devices are measured using this generation. I built a pendulum counter with one also. Great little units in micro volt systems.

[@walterbaltzley4546]

It would be interesting to combine the flux generator with a Milkovic Pendulum System

[@silverpc4611]

from what I remember in electronics class. there was only so much magnetic flux that a coil could absorb. and its the collapse and rise in a magnetic field, that produces electricity. The rate at which a coil can absorb and release the flux determines a max speed after which the added electricity produced gets smaller and smaller.

[@williamarmstrong7199]

That sounds like a harmonic within the flux.

[@OldManSparkplug]

Brilliant. I was trying to figure out what the difference between this kind of generator and a guitar pickup right up until 4 and a half minutes when you pointed out that's exactly what it is. Fantastic video.

[@NwoDispatcher]

Might be a good way to do that with those vibration wind generators

[@AndreaDingbatt]

Thank you Robert, ~ you certainly keep the grey matter working!! 🙂 Andréa and Critters. ..XxX...

[@tuberdave1]

A brilliant explanation! Thank you.😊

[@michaelcerkez3895]

Very interesting Sir. And thank you. I've been playing electric guitar on and off ( pardon the pun ) for 45 years. I never knew exactly how the pick-ups worked. I always thought it to be a form of "Black Magic", but then isn't all electronics that?

[@roystonjenkins7436]

The Royal Navy's Seaslug missile used a switched flux generator for its power supply; driven by the efflux of a gas generator it had a operational 'life' of about 60 seconds. They used to test-run them using a compressed air supply to check that they worked.

[@michaelbrukley1311]

So I had an idea for a generator that kind of worked on a similar principal. The base idea is take a rotor out of a drill motor or a dc motor. And instead of spinning the rotor amd leaving the brushes stationary spinning the brushes and leave the rotor stationary which in turn spins the created magnetic field. There are people who are trying this using electronic control systems to excite coils in a rotational pattern to generate power but this would be a more low budget version for the idea.

[@whatelseison8970]

That's called an outrunner motor.

[@icebluscorpion]

Hey rob, did you know that you can store a magnetic Feld im a iron ring core and you can release it much much later by braking the ring? It is called Edward Skalinin Perpetual Motion Holder. It uses the same principles. You can get very high pulses the faster you "brake" the magnetic connection. It has only two coils and a ferromagnetic ring like a U formed iron cord and a I formed iron core that magnetically short circuits the U formed iron core. I wonder if it also works with Paramagnetic material too🤔. You can "Charge" the magnetic device with a little puls and it contains the magnetic feld with out even magnetizing the ferrous core. Because after pulling it perpendicular to the magnetic Feld apart, it doesn't have any magnetic fields whatsoever. RWGresearch did an experiment where he had a charged PMH stored for 2 years and he got a puls out of it with the same strength as if he had charged it seconds ago. I can't put a link in my comment or it will be deleted. So just type "RWGresearch PMH" in the YT search bar pretty much every video is a good one. Cheers Pal, keep it up!

[@yasararif8292]

Magnetism and electricity fascinate me to a next level. Can we use magnetism to stop missiles killing little babies.

[@maranmarantakeiteazie]

rob, that's mental yoga! brilliant as always!

[@walterbaltzley4546]

I have had an idea for several years now for using carefully tuned copper wires instead of coils. As the wire crosses the field lines (or vice-versa), a pulse of electricity is generated in the wire, which in turn generates a radio wave. These radio waves could then be collected by a properly tuned rectifying-antenna and then dumped into a capacitor. Another option would be to absorb the radio-waves, convert them to heat, and use them to drive a heat-engine or turbine.

[@TheIgnoramus]

You should really find the video of the Russian guy making a disk float on AlienScientist. Video doesn’t exist anywhere else. I think you nailed a part of what he does. Two months ago I think. Good hunting!

[@walterbaltzley4546]

@@TheIgnoramus Most anti-gravity craft make use of strong pulsing dielectric (static) fields as opposed to electromagnetic fields. If you are interested, look up "The Secrets of Cold Electricity" by Eric Dollard and Peter Lindeman. The most important concepts are: The Electro-radiant Event and Radiant Energy. These concepts seem to be strongly linked to UFOs and Anti-Gravity.

[@johnwale2886]

Thanks, Rob, this was a very educational video. If you think in terms of a magnetic field varying over time, it explains how a transformer works as well as motors and generators.

[@douglascalhoun6471]

Fascinating idea, it simplifies some of the design of a generator. The high frequency might prove to be a challenge to overcome.

[@synchro-dentally1965]

Great video Rob! Will you be recreating Tesla's remote controlled boat in the future?

[@eugeneleroux1842]

Thank you for some real original thinking.

[@rbartsch]

Great video! A Switched Flux Generator seems to be an interesting option for a turbo-charger based gas turbine. It would be interesting to see how a horseshoe magnet with coils behaves when disturbed by the intake fan of a running turbo-charger.

[@JustavvaGo]

Looks like i'm not the only person thinking about using a turbocharger (highly balanced piece of available equipment) for moving air and maybe also for generating!! I also like the idea of not moving either coil or magnet. As i saw the video i imediately thought of a polewheel on a car for the ABS, there is a sensor next to it which is also used by some manufactures to read Tyre Pressures(TPMS) Once a mechanic, always a mechanic. 🙂

[@samspade7522]

Robert Always fascinated by you videos. I once worked in the x-ray industry (imaging not therapy) and the image intensifiers would distort the image presented to the doctor as the patient table was tilted through the earths magnetic field. The solution was to shield the input phosphor with 'mu' metal to block the magnetic lines. Have you ever heard of using shielding ( flux reduction) in a generator similar to the one you just described? Keep up the great videos.

[@bombjack7000]

Great video, again, Rob! This sounds to me like an interesting application for an old circular saw blade. Saw blades are precisely made, well balanced and can take a beating. Maybe even in a stacked setup of coils - blade - coils - blade, etc. running every other blade in the opposite direction. Well, could also be a great recipe for disaster ... 😂

[@ThinkingandTinkering]

nice suggestion mate - cheers

[@BJL2142]

Great topic Rob! you have my curiosity going wild :) im dreaming of these generators as a replacement to the compressor half of a turbocharger, so much energy is lost to exhaust gases, it would be great to be able to capture some of it, and the turbocharger comes to mind because of the high rpm they achieve and that their operation is already to spin as well as possible :) im sure formula one has something going on, im sure thats some top secret stuff lol

[@chrisgmurray3622]

I don't speak science or maths, but I enjoy watching your videos because I believe in exposing myself to the unfamiliar as well as the familiar. For me, this fires my imagination and starts me thinking out side the box ( which actually isn't that unfamiliar to me) but in an area that I can't practically apply anything, more likely slowly absorb a few things by psychological osmosis. I find this kind of thinking is brilliant when focussed on more well-known areas after a spell elswhere, and leads to all kinds of artistic breakthroughs in my musical wanderings. I look forward to each video in the same way as someone might enjoy watching a foreign film, and take on board some of themes being addressed,by not having a preconcieved idea or model to impede my free thinking; in fact it is mostly Greek to me but I find it interesting anyway somehow. Thanks for your thoughful approach snd cheerful presentation, as it helps me like a small candle illuminating my unsure footsteps in an unknown building.

[@jawatazi5054]

Could you use a steel vented disk brake, maybe on a bicycle disk to power the lights , might make one this weekend see how it goes

[@11Sam11]

Great video. Having magnets on each side of the coil with ferrofluid magnetized to it should constantly trigger the magnetic flux from the brownian motion of vibrating nano ferrite particles in a liquid that are constantly in motion not stationary. plus the ferrofluid can be used to reduced the magnetic reluctance and increase conductivity if setup correctly. It should be really simple to do with no effort at all. I hope someone gives it a try. Thank you as always Rob

[@foogod4237]

The problem with that is that an applied magnetic field essentially holds the molecules of the ferrofluid in place and will prevent normal Brownian motion from occurring. There is no such thing as a free lunch. If you want energy (electricity) out, you need to put energy in in some other way (such as by physically moving the material into and out of the field yourself).

[@11Sam11]

It’s true that it slows down the Brownian motion which appears to be solid to some extent. However, According to few scientific peer reviewed journals on kinetic theory and micro fluidics. Atoms and colloidal particulates including ferrofluids that are suspends in certain surfactants does in fact moves freely to some degree in a similar fashion of a stirring effect circular motion, which in theory might be enough to effect changes in the magnetic lines of flux. You can take one step further to even add a basic diamagnetic element in conjunction like graphite or bismuth that can redirect the electric dipole of a magnetic field to do some work if you understand what I’m saying. Free lunch is everywhere (potential energy). It all depend on the observable imagination and ones ability to make it happen as a lot of great ideas gets lost die to misdirection on what possible or not.

[@lorenbush8876]

That is interesting, thanks.

[@bobvincent5921]

exceellent.

[@McRootbeer]

So theoretically, you could make a really simple generator/motor with stationary magnets and coils. You vary the magnetic field by the shape of the steel/metal/(conductive ink?) In the moving rotor. Right?

[@ThinkingandTinkering]

yes

[@tomikoski5124]

Thank You.

[@MickEMaus3000]

Microwaves seem to be a source of all sorts of interesting bits.

[@jimparsons6803]

I had heard about the pickups on electric guitars, but not about the 'Anderson Generator.' My thanks. To make a radio transmitter using one of these Generators, you would have to change the carrier wave made by the Generator (?), perhaps by a second coil?

[@omari3059]

Great video. Will you be producing one any time soon?

[@wachtmanknifeandtool]

Just found your channel this morning and I just wanted to say I think what you're doing is amazing. I have recently become fascinated with energy generation and your videos are a wonderful resource!

[@Berkana]

Robert, could you explain the claw-pole alternator next? While looking for images of switched flux generators, I saw some images for a strange looking device that is dubbed a "claw pole" alternator, but I don't see any Wikipedia entry for these things, and the explanations I did see were over my head.

[@ThinkingandTinkering]

i have done a couple of things on that mate - but i can redo it for sure

[@EliotTruelove]

Hey Robert, what are your thoughts on ArcFlashLabs coil gun? Is there any way they could spin/rifle the armature (steel rods that get fired) for better accuracy?

[@azlandpilotcar4450]

I really like that the rotor can be a flywheel.

[@solarfluxman8810]

Iron does two things. It provides an easier path for the magnetic flux to flow, but it also increases the strength of the field because the domains in the iron temporarily align which makes it temporarily become a magnet.

[@slick05123]

This is super interesting to me! Is the iron core in the copper winding required for it to work? Or will it work with just copper winding, a magnet, and steel switching?

[@clintonlau5826]

when you put the iron up to the coil end the contact made completes the reaction and remove the contact a switching effect manifest in the coil could you then place many coils together to give contunious output or caps between them to smooth the flow.

[@neuthral]

i think when the magnetic flux path gets broken it naturally moves to its original state and you have a moving magnetic field

[@MustafaSankar]

The Awesome Robert ❤

[@bearnaff9387]

I am put in mind of the Wind Ribbon style of wind generator. I wonder if switched flux generation would be better suited for ribbons than mounting a high powered tiny magnet on the ribbon and vibrating it in front of a coil. You could use any number of different steel sources, including the previously-mentioned guitar string!

[@8ank3r]

Great stuff as always Rob. Does this type of generator have a lot of cogging? It seems that it would.

[@robbie.robertson]

Would it be useful as wind turbine generator, using a 3D printed disk with slots around the outer that contains metal strips? And then coil+magnet next to the spinning disk...

[@damonvinsant364]

Good job, you videos have me in brainstorming overdrive 😅 Could you combine multiple simple made Flux switching generators that produce good voltage but low current with fractal capacitance to convert the power to current and voltage levels suitable for battery charging? Would there be any benefits to that past cheep DYI?

[@terranearthling9918]

Any chance you have the patent number for the Alexanderson Alternator ??

[@Barskor1]

Will it burn out like a wind turbine in a storm? Why not with a big slotted metal disk didn't they put mutlipule coil and magnet arrangements on both sides of the disk?

[@jyvben1520]

are there generators which use an inner and outer coil where the magnets spin in between, also for this flux generator combined with tesla turbine

[@whatelseison8970]

Look for axial flux coreless motor.

[@willowkonrad8893]

Interesting video. If someone were to build one on youtube and load test it and demonstrate how they can produce more power without loading up the prime mover and slowing it down as much as commonly used ones, that would really be something. I get why no-one does. They can make life pretty inconvenient for people especially if they have families to feed etc.

[@foogod4237]

The reason nobody does that is because these motors _don't actually produce more power_ than traditional designs do (if you note, he never actually said they did, either). They're actually typically much _less_ efficient overall, which is why they're generally only used in specialized applications where normal generator designs don't work well for some reason.

[@wazittuyoo2147]

I once a Adanson/ Faraday motor. I think it might have been induction though. In that case, with brushes, or alternative switching, it might self run. I will try and find the video, and send it to Rob. In the meantime, please, anyone who could shed some light on this concept, please share. The experiment that I saw was approximately 10-12" in diameter. If viable, homescale generation would be quite easy to accomplish.

[@TheWorldBelow360]

Gaussian Rotostroboscopes are a delight to be seen! If only we could better understand what it could optimally mean!

[@sinenomine9093]

What's the efficiency of flux0switched generators? Power in vs. power out (energy in vs, energy out) ?

[@robertmay2665]

Can you spin the magnets and the coil in opposite directions ?

[@martinlicht1969]

Thanks, and thanks to Les Paul for the electric guitar application too!

[@isaacwhite7411]

yea I thought about the same thing on a bicycle to use the spokes as generation by flux the magnetitic field to make power.

[@williamarmstrong7199]

That makes me want to experiment. How would a static magnetic field react if you put 2 coils of different windings inside the static field then excite one or other of the coils to distort the static magnetic field then collapse the sub field by switching the power to on or off on the parasitic coils? I wondee if this could work on a harmonic within the field to build a higher power output than input? This might work on a strong perminalent magnet? Food for thought.

[@daveh6356]

Awesome - should simplify a few things. What's the efficiency hit? Reluctance through air/steel doesn't seem as high vs electrical resistance through air/steel (more flux leakage).

[@AdlerMow]

Can you bring us a build of this? I'm craving over it!

[@tonysmith8747]

Ta Rob.

[@foogod4237]

One thing you didn't mention is that the reason these generator designs are only used in fairly specialized applications is because they're actually very inefficient compared to more typical kinds of generators. If you can actually move the magnets or the coils relative to each other, that's almost always a more effective way to generate electricity. It's only in cases where that's really impractical (such as producing very high frequency AC, or when using a rocket engine) that this sort of thing becomes really worth trying.

[@partoftheabsoluteone4960]

Now if you could just transform/convert that high frequency signal produced back down to say 50/60Hz.......and control the output voltage to say 230v........That could be a very interesting project indeed! 🤓⚡⚡⚡

[@0richbike]

I believe that's the same principle as the electric guitar pickup. Only quieter;-)

[@0richbike]

Doh. Must watch whole video before commentating

[@christopherleubner6633]

An extreme version of this property is an explosively excited electromagnetic pulse generator. A magnetic field is established and the explosives move the msgnetic field very rapidly over a stack of resonance cavities. It is a single use device but the output can be thousands of amps at hundreds of kilovolts at a high frequency 😮

[@kadmow]

Yep - and Tesla have used Permanent Magnet Switched Reluctance motors - model 3 front motor?? - model S rear motor?? Indeed, there are many benefits.. - Switching the reluctance removes the need for brushes and / or sliprings - as none of the electrical components (traditional stators / rotors - be they field windings of collectors) are rotating, just the rotor (speed control with feedback is pretty trivial these days). - The convertibility of motors to generators (not optimal mostly, but it works) vice versa, fantastic. (same with fluids - the prime mover can often become the motor))

[@colinmcdonagh4705]

Turbo on an ICE comes to mind some of them go 250k rpm.

[@OverwoundGames]

Mu-Metals always seem to offer promise in flux switching designs.

[@tenij000]

gone make wind whit that iron wheel turn it infront of it

[@petevenuti7355]

Tesla turbines were the first thing to come to mind, then iron wires twisted with copper. Using bismuth and pyrolitic graphite to bend the magnetic field also...as bismuth wouldn't suffer from the magnetic breaking as much, don't know about the graphite

[@aaronsmith593]

Is perpetual motion a reality?

[@sailaway8244]

Maybe it's time to get the old rocket stove out and have a play 🤔

[@Clintimtired]

But if you use like a large copper or aluminum disc with pieces of steel stuck to it equally apart so the magnet attracts and then repels is I know aluminum and copper react in different ways with a magnet would that make your magnet field do more work And if the rotor was copper maybe you could draw a little electricity off from that too because it's spinning close to the magnet that doesn't move in the other coil

[@robhudson1501]

This could be groundbreaking for wind generation

[@MaxBrix]

I wish you had put a capacitor on the flux generator.

[@pauldent3059]

Could they not use that for cars instead of an alternator by either the exhaust or through a water pump it would increase the efficiency of the engine

[@foogod4237]

He didn't actually mention it, but the reason why these designs are not used except in really specialized applications is because they're actually a lot _less efficient_ than standard generator designs are. Plus, where do you think the energy produced by the water pump comes from? Or the force of the air coming out of the exhaust? They're all produced by the same engine, and if you put something in their path like a turbine which then requires more force to be applied for the same flow, then you're really just making them pull more energy from the engine to do that, so it would still be powered from the same source, just in a more convoluted and much less efficient way. (Plus, modern engine designs are actually tuned very precisely to match the engine to the amount of back-pressure produced from the exhaust system to maximize their combustion and fuel efficiency. If you add something like this to the exhaust without accounting for that, it would likely throw off that whole balance and make the engine itself burn fuel much less efficiently.) In any case, the alternator in a typical car engine also takes a pretty minuscule amount of power compared to everything else the engine produces to actually move the car, etc, so even if you made that bit perfectly 100% efficient, it really wouldn't make much of a dent in overall engine efficiency at all anyway.

[@Clintimtired]

What if instead of a piece of steel you use a magnet would you get power from the flux movement and More power because the coil would also have another magnet interacting with it maybe a little bit more of a distance but still

[@foogod4237]

Well, sort of, yes, but then technically you've just built a standard sort of generator where you're moving the magnets relative to the coil, and if you're going to do that, then you might as well just use one of the existing standard (rotating) designs for that which would probably work much better. The whole point of this design is that you _don't_ need to move any magnets or coils to make it work.

[@Clintimtired]

@@foogod4237 yeah I see your point kind of like better just to do one thing at a time and try things out individually

[@Roland14d]

RM-S: I just ran across this article "Biofuel tested for coal-fired steam locomotives in eastern Japan". - The magic ingredient is Biocoke. Anyone have any good, useful info on this? --Useful meaning can I make it at home and would it be worth the effort. Thanks much!

[@justtinkering6713]

Didn't you already cover this in a prior video?

[@pedjamilosavljevic6235]

I believe that video you are talking about , I'm assuming , is a video about switch reluctant motor (maybe there were two videos) from couple years ago.

[@justtinkering6713]

@@pedjamilosavljevic6235 I think so too. Motors and generators are much the same.

[@huguesl.gingras4457]

🤔why not combinig that principle with the tesla turbine

[@danblankenship5744]

Non-ferrous and ferrous metals affect the magnetic fields differently. Non-ferrous will set up eddy currents which will resist and push back the flux, while ferrous will want to become magnetized and draw in the magnetic flux. If you alternate these metals and spin them...hmm

[@amadensor]

How is it better than spinning the magnets? I understand that spinning the coils introduced brushes, but alternating magnets seems similar mechanically to slotted steel.

[@foogod4237]

It depends on how you define "better". If you are talking about efficiency or power capacity, then no, it's actually much worse. That's why these sorts of generators have only ever been used in specialized applications where typical designs just can't be used for some reason. However, if you do have one of those situations where moving the magnets or the coils is impractical or impossible for some reason, then these are much better, because they can actually still work when the other designs can't. Those situations are pretty uncommon in the real world, though.

[@amadensor]

@@foogod4237 when would moving the magnets be impractical, but moving a slotted disc be fine? I'm sure there are times, I'm just not sure what they are.

[@foogod4237]

@@amadensor Usually, it's an issue in situations where you need to reduce the mass of the moving parts as much as possible. Magnets and coils, particularly powerful ones, can be heavy, and thus moving them at high speeds can be a problem (this is why the Alexanderson alternator was created, because they needed very high frequency AC (for radio communication), but spinning a typical generator with heavy magnets/coils so fast that it could produce that would have been completely impossible.) Alternately, there are some situations involving high-temperature environments, which are hot enough that they would cause the magnets to lose their magnetism, or damage the electrical coils, etc. In those situations, you can have a (temperature-resistant) spinning disc interacting with part of the magnetic field path (which is some distance away from the other components), while the actual magnets and coils remain safely insulated and cool (they don't need to even have any physical contact), etc.

[@allenhargis4317]

You forgot to design Lenz law to your generator, Oh dear! What are you doing?

[@lagunafishing]

Does it work the same way as one of old fashioned door bells that go Ding Dong?

[@richardmarkham8369]

No. They are an electro magnet (solenoid) that pulls a bar across against a spring. It hits the chime bar. When you let go of the button, the bar springs back, hitting the other chime.

[@lagunafishing]

Thanks. @@richardmarkham8369

[@wazittuyoo2147]

Yt even mis-spell check posts. Bee advised.

[@foogod4237]

It's not actually that you're changing the _path_ of the magnetic field. That actually doesn't matter at all. It's that you're changing _the amount of energy contained in_ the magnetic field. When you say that the field "wants" to go through certain materials, the field doesn't technically "want" anything at all (it's not sentient). It actually just means that _it requires less energy_ for the field to flow through those materials, so it does to a greater degree. Therefore, if you have a particular space, with a magnetic field across it, if that space is made up of air, the magnetic field in that area will actually contain much more potential energy than if the space is filled by, say, iron. So if you take that air gap, and fill it with iron instead, all the extra energy contained in that magnetic field needs to go somewhere, and it ends up going into electricity in the coil. If you then move the iron out of the way, the field then gains more energy again (which causes electricity to flow the opposite direction in the coil). So even if the path of the magnetic flux does not really change at all (it's still going through the same space), changing the material it needs to flow through changes the amount of energy contained in the field, and doing that repeatedly back and forth will cause the electricity to flow back and forth in the coil as well (producing AC power). This is actually the same principle that is the reason why there are air gaps built into many transformer cores (to tune how much magnetic energy can be stored in the core, and thus how much power can be put into them before magnetic saturation occurs), etc.

[@drsatan3231]

Spoken like someone who does not know what flux switching is

[@drsatan3231]

So, if the energy put into the field hasn't changed, just had its polarity switched Why would the flux density increase? The amount of energy _in_ the field is its flux density Where has this new energy come from? Or are you of the mindset that flux switching violates the laws of thermodynamics?

[@foogod4237]

@@drsatan3231 Yes, the flux density of the field is in proportion to its energy. I never said it wasn't. My point is that _flux density and path are not the same thing._ The field can follow exactly the same path, but have different flux density, and this principle still works. The reason this is relevant is because the place where you are changing the magnetic materials does not have to be anywhere near where the coil is, and in that case, the path of the magnetic field that is applied to the coil does not change at all (you are not moving the field relative to the coil). It is only the _strength_ of the field that the coil sees which will change, because the total flux density (energy) of the system has increased or decreased. And the energy comes from the physical work of moving the iron (or other appropriate material) into and out of the path of the field.

[@drsatan3231]

@@foogod4237 how is the flux density of the field increased by switching the polarity? You seem to have forgotten to explain Concentrating a field does increase flux density. It still has the same flux density it's just crushed into a smaller space. It increases energy density but the flux density remains constant Flux density is not energy density. They are seperate

[@foogod4237]

@@drsatan3231 There is no "polarity" being switched here, at all. I think you may be misunderstanding the design he is describing in this video. (So I can't explain something that doesn't actually happen) And flux density is _literally_ the technical term for how much the magnetic field (flux) is "crushed into" its space (density). Saying that it's "crushed into a smaller space" but also has the same flux density is actually a contradiction in terms. Also, there is no such thing as "energy density". Energy is just a quantity. You can have more, or you can have less, but it doesn't have "density". The flux density in a particular material is proportional to the potential energy contained in the field in that space. Always. They are technically different things, but they are always closely related. You cannot have more flux density (in the same material) without adding energy, and you cannot reduce the flux density without losing energy in the process. However, changing the reluctance of the material does change the relationship between energy and flux density. A higher flux density in iron can actually have less potential energy than a lower flux density in air, which is exactly what is being exploited in this case (the end result is that the potential energy which was contained in the magnetic field travelling through the air is no longer required for that purpose, and can actually go into increasing the flux density in the rest of the system, which changes the flux density seen by the coil, and induces an electric current).