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Author Topic: TOROID QUESTION  (Read 3397 times)

Offline magnetman12003

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TOROID QUESTION
« on: July 17, 2016, 09:11:32 PM »
I have a huge toroid that measures 4 inches in diameter and 1 inch thick. A SINGLE 13 gauge wire is wrapped around the entire toroid donut circumference.. That turns it into a huge choke??
My question is this:  Say I placed that toroid very close to an extremely powerful rapidly spinning  diametric neo ring magnet that spins N/S poles.   Would I be able to extract high frequency AC current, with low AC voltage from the toroid?

Offline gyulasun

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Re: TOROID QUESTION
« Reply #1 on: July 17, 2016, 09:45:40 PM »
Quote
I have a huge toroid that measures 4 inches in diameter and 1 inch thick. A SINGLE 13 gauge wire is wrapped around the entire toroid donut circumference.. That turns it into a huge choke?? 

Well, it turns it into a single turn iron cored coil. It would work also as a choke but in the higher frequency ranges like from some ten or some hundred kHz and higher. In the low frequency ranges like under say 10 kHz and lower, such coil would probably have a low L inductance so it would not readily 'choke' lower frequency currents.

Quote
My question is this:  Say I placed that toroid very close to an extremely powerful rapidly spinning  diametric neo ring magnet that spins N/S poles.   Would I be able to extract high frequency AC current, with low AC voltage from the toroid?

You would be able to extract AC current from it of course but how high frequency the output current would has just depends on the RPM of your ring magnet. If your RPM is say 3000, the frequency, f, would be 50 Hz or RPM is 30,000 then f would be 500 Hz and so on (RPM=f/60 for a two pole generator).   (see this: https://en.wikipedia.org/wiki/Revolutions_per_minute  )
And yes, the induced AC voltage amplitude would indeed be a low value due to the single turn coil, this is also influenced by the magnetic permeability of your toroid core and the RPM of the ring magnet: the higher both the permeability and the RPM, the higher the amplitude of the induced voltage will be The AC current can indeed be high due to the thick wire you use. 
Notice: You may wish to use isolating tape around the outside circumference of the toroid if you use bare wire for the single turn because some ferrite materials may conduct current through or on the surface of their body (I think some MnZn types), hence this would tend to shunt the coil.

Gyula

Offline magnetman12003

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Re: TOROID QUESTION
« Reply #2 on: July 17, 2016, 10:11:51 PM »
Well, it turns it into a single turn iron cored coil. It would work also as a choke but in the higher frequency ranges like from some ten or some hundred kHz and higher. In the low frequency ranges like under say 10 kHz and lower, such coil would probably have a low L inductance so it would not readily 'choke' lower frequency currents.

You would be able to extract AC current from it of course but how high frequency the output current would has just depends on the RPM of your ring magnet. If your RPM is say 3000, the frequency, f, would be 50 Hz or RPM is 30,000 then f would be 500 Hz and so on (RPM=f/60 for a two pole generator).   (see this: https://en.wikipedia.org/wiki/Revolutions_per_minute  )
And yes, the induced AC voltage amplitude would indeed be a low value due to the single turn coil, this is also influenced by the magnetic permeability of your toroid core and the RPM of the ring magnet: the higher both the permeability and the RPM, the higher the amplitude of the induced voltage will be The AC current can indeed be high due to the thick wire you use. 
Notice: You may wish to use isolating tape around the outside circumference of the toroid if you use bare wire for the single turn because some ferrite materials may conduct current through or on the surface of their body (I think some MnZn types), hence this would tend to shunt the coil.

Gyula
  Thank you for a quick reply to my question. Just what I have been looking for-- A device that needs the hi current low voltage is in the making.