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Ok just an idea here but how about I simply build the thing like a simplified version of a smps power supply which it in some ways is. In other words I get my mains isolated AC voltage rectify it to...

the first schematic seems like an astable multivibrator type of self resonant circuit, are those generally reliable in terms of that they might not want to start up some times etc?

I guess I am...

I'm helping out a friend who is a metal worker, thing is he would need an induction heater but he would need to heat both large pieces as well as smaller individual ones like parts of a single shaft...

Can anybody say anything with regards to my post ?
thanks.

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I tried to keep this thread simple, pardon for failing to do that , I am not the best when it comes to explaining what I think.
It is just a rotating capacitor that has different...

well i'm just trying to understand whether the rotary capacitor idea is logical or practical at all because if it's not then making block diagrams for something that doesn't work isn't much use.
...

Well I don't think that there should be mechanical imbalance as the rotor should get balanced before assembly, now i'm not looking for 50hz as that would require very large capacitance in order to...

well I think it would have to be something different than wax paper, first of all because was paper doesn't introduce any large increase in dielectric constant and the other reason being is that the...

no in my case each plate is in parallel so I can simply add the capacitance, each two plate sets produce me about 400 cm2, so I count together all the plates I have in parallel and use their surface...

sure, well that is why i'm thinking what is the smallest possible airgap I could have, given all tolerances are very tight and everything is made spot on.
I'm thinking ideally the real airgap which...

If by Er you mean capacitance then yes, I did calculate the total capacitance given the same overlapping surface area and airgap with different dielectric constants.

so as an example if my airgap...

well i can't predict the exact range as that would have to be nailed down to simulation and or real life tests/calculations but overall in the Mhz range , say 1-100Mhz.

well i thought about that too, honestly i would need to know what best numbers i can get with superdielectrics in reality maybe i dont even need liquid or otherwise because i'm working with high...

yes with K I was referring to dielectric constant, the reason I aim for the highest possible in life attainable dieletric constant is exactly because I have to compensate for the airgap being there, ...

Hi so my goal is to make a rotary capacitor, the purpose is rather complicated so right now i'm just looking whether I can make the capacitor at all with the intended capacitance.

given I use thin...

Hi I am reading about klystrons for some time, Now I understand the bunching and velocity modulation due to the E field between the cavity plates where the electrons pass through the hole in the...

I suppose you mean losses with respect to the solenoid when there would be this block introduced in the very middle of the flux path? But since there still would be a significant space between the...

But in theory since the field is time varying (AC) shouldn't I be able to put some thin foil around the rotor and the field couldn't penetrate because if the foil would have no holes in it, the eddy...

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It's not a motor, torque here isn't relevant, it is a thought experiment that Ii want to try out, but before that I am making sure it will work in theory at least.
so I have a rotor shaft...

Well as of now nothing is realized this is just a thought so I don't know , but I assume that all metals more or less will get heated with high frequency AC fields, I am planning on going up to 1Mhz...

Imagine there is a rotating shaft, most likely made of some stainless steel or some other metal that rotor shafts are made of, but I have a solenoid mounted on the rotor shaft, the diameter of the...

The idea here is this as much as I could understand, that the formula you gave me and also the one he has in the upper part calculates the voltage of the disc assuming that the field strength (in my...

My friend calculates the formula with the addition of introducing the "magnetic induction in the airgap" and he gets a much lower result than I do, I got given my input parameters 4.8 volts which...

yes sure if AC field then AC output, I was just wondering whether something changes with the AC field or does the peak AC field strength equals the same output voltage as if the same strength DC...

sure the same laws of resistance heating etc apply to the disc as well as any other generator that works with induction.

rpm/min is just a short for RPM in one minute.
3000 rpm is not that high ,...