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  1. Replies
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    Closed: Re: powerful induction heater advice?

    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...
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    Closed: Re: powerful induction heater advice?

    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...
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    Closed: powerful induction heater advice?

    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...
  4. Closed: Re: Klystron output voltage, cavity field strength

    Can anybody say anything with regards to my post ?
    thanks.
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    Closed: Re: Rotary capacitor physics and design

    153815

    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...
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    Closed: Re: Rotary capacitor physics and design

    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.
    ...
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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.
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    Closed: Re: Rotary capacitor physics and design

    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...
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    Closed: Re: Rotary capacitor physics and design

    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, ...
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    Closed: Rotary capacitor physics and design

    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...
  16. Closed: Klystron output voltage, cavity field strength

    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...
  17. Closed: Re: Rotor shaft within AC solenoid question

    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...
  18. Closed: Re: Rotor shaft within AC solenoid question

    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...
  19. Closed: Re: Rotor shaft within AC solenoid question

    153520

    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...
  20. Closed: Re: Rotor shaft within AC solenoid question

    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...
  21. Closed: Rotor shaft within AC solenoid question

    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...
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    Closed: Re: Faraday disc voltage calculation formula

    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...
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    Closed: Re: Faraday disc voltage calculation formula

    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...
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    Closed: Re: Faraday disc voltage calculation formula

    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...
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    Closed: Re: Faraday disc voltage calculation formula

    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 ,...
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