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Thread: homopolar generator

  1. #1 homopolar generator 
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    What factors play into how much current is produced by a given homopolar generator? For instance, wheel diameter, configuration of the magnetic circuit, speed of the spinning wheel, material composition, etc. And of the material properties, which would be the best for getting the highest current and potential difference for a homopolar generator?


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    Moderator Moderator Janus's Avatar
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    The formula for the voltage output of a homopolar generator is



    where B is the magnetic field,
    is the angular velocity of the disk
    r is the radius of the disk.

    The current will be resultant on on the output voltage and the resistance of the load plus internal resistance of the generator. So the limiting factor for current would be the internal resistance of the generator.


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    so, if I were to use a superconducting disk(as an example) there would be no real limit to the current that could be produced?
    Last edited by Arcane_Mathematician; August 7th, 2011 at 12:41 AM.
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    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by Arcane_Mathematician View Post
    so, if I were to use a superconducting disk(as an example) there would be no real limit to the current that could be produced?
    Not exactly. The more current the load draws, the more effort it will take to turn the disk at a given rpm. So the current limit in this case would be set by whatever is turning the disk and how much torque it can provide.
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    Quote Originally Posted by Janus View Post
    Quote Originally Posted by Arcane_Mathematician View Post
    so, if I were to use a superconducting disk(as an example) there would be no real limit to the current that could be produced?
    Not exactly. The more current the load draws,the more effort it will take to turn the disk at a given rpm. So the current limit in this case would be set by whatever is turning the disk and how much torque it can provide.
    Well, the idea is more to spin it, in order to generate a stored kinetic energy, that can be dumped into electrical energy by connecting the wheel into an electric circuit. The goal is to generate as much electricity as possible, in a relatively short period of time. Kind of treating the generator as a "kinetic capacitor" so to speak
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    Quote Originally Posted by Arcane_Mathematician View Post
    What factors play into how much current is produced by a given homopolar generator? For instance, wheel diameter, configuration of the magnetic circuit, speed of the spinning wheel, material composition, etc. And of the material properties, which would be the best for getting the highest current and potential difference for a homopolar generator?
    what is homopolar generator?
    Knowledge is precious,so appreciate them..
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