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Thread: Monopole Magnets

  1. #101
    Quote Originally Posted by Tom C View Post
    Lman,

    I have seen rectangular, square and round disc magnets on John's machines. the magnet needs to completely cover the core (7/8 over a 3/4 core on the vanilla SG) never have seen it done with a ring magnet. I want a solid north face on all my monopoles.

    Tom C
    MrAngusWangus on youtube uses ring magnets from old speakers on most of his machines. I have been wondering what the magnetic field of these looks like as compared to a solid round magnet.. I seriously doubt that the ring magnets are anywhere near as good as solid ones. What I noticed on an old machine that I experimented on is that when your coil is centered on the ring magnet, the ring magnet acts as two separate magnets because of the gap in the middle. Maybe if I had used a bigger coil it wouldn't be as such, but with the void in the middle, I can't see how this would be any bit beneficial.
    However, in my head I imagine ring magnets as having a vortex of magnetism in the center of them... so maybe, just maybe, a machine could somehow take advantage of said vortex (if it actually exists?).

    I am going to use the rotors that I made with the ring magnets for a generator experiment with U cored ("leedskalnin PMH" cores) coil setups, using different types of coils and different configurations, so maybe somehow I will be able to find out if these magnets do indeed have a vortex in the middle that can be taken advantage of somehow, someway.

    -Brian

  2. #102
    Hello all.

    Can someone tell me what are the drawbacks if I use neodymium magnets of a different size instead of ferrite of 1 x 2 x 1/2 inches size?

    Can't I simply change the distance of the coil to compensate the strength of the magnets I choose?

    Cause I having trouble to find the correct size of this magnet.

    Thank you for your support.

  3. #103
    Senior Member Tom C's Avatar
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    experimental Kits, chargers and solar trackers

  4. #104
    Senior Member Faraday88's Avatar
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    Quote Originally Posted by Tom C View Post
    Welcome all,

    The first thing we want to get out of the way is magnets, which to use? we only use Ferrite C8 in the monopole energiser. 3/8" by 1" by 17/8" almost every magnet supplier on the face of the planet has this exact magnet or something similar. John will be posting on the reasons for this decision at a later time.

    Tom C
    The Answer to this will end this Thread.... but yes i think i know what the answer is... A cubical Magnet is just as good as the Answer is..
    Rgds,
    Faraday88.

  5. #105
    Quote Originally Posted by Tom C View Post
    there is no secret. no 3D monopole topology, unless you mean all norths out. the north pole switches the core causing induced current in the trigger wire. which is why coil winding and orientation are important. the north pole on most magnets is a bit stronger than the south. howard Johnson showed this in his book the secret life of magnets, I think that is what it is called.

    you are mixing floyd sweet and his vacuum triode amplifier, and the monopole. which means only north poles out - mono-pole.......

    there ARE however specific things you can do to build it right, we have talked about those. match all components, match the coils, use 18 awg, all north CERAMIC magnets, limit mechanical friction, or build it solid state.

    Tom C
    Tom can you elaborate more on what "use 18 awg" means? Are you talking of the wire to be used in the circuit or the Power wire in the coil? Because I have used 20AWG and 23AWG on the Power winds also...

  6. #106
    Senior Member Tom C's Avatar
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    you can use 18 awg for power with a 20 for trigger or you can use 20 and 23..... depends upon what you have and what you are driving. 18 power and 20 trigger works better at 24 volts for me.

    Tom C


    experimental Kits, chargers and solar trackers

  7. #107
    Tom,

    I am seeking to charge a 18Ah 12V Lead Acid Battery. The input is exactly the same.
    In the future I would like to charge a whole bank of these as well as use multi-turns on the coils.

  8. #108
    Senior Member Tom C's Avatar
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    20 and 23 at 12 volts will work fine for that battery...

    Tom C


    experimental Kits, chargers and solar trackers

  9. #109
    Ok. Thats what I have on the coils and the SG is running however it is at a slow-medium pace and is NOT tuning despite following the instructions completley. I thought at first it may have been a magnet issue. I will place a video soon on this illustrating the situation...

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