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  • Harvey
    replied
    Originally posted by Michelinho View Post
    Hi all,

    A picture is worth many many words. Here is what the core looked like in those good old days. I did squeeze it with a little twist so the wires show.

    Take care,

    Michel
    Thanx for that. Tesla like using wire for cores also. It prevents Eddy currents

    Leave a comment:


  • Cloxxki
    replied
    Amazing pics David! Circular deformating, who could even think of that?

    I am wondering now whether your effect are showing despite the obvious asymetry of your pipe layout, or thanks TO sufficient asymmetry.

    Leave a comment:


  • Harvey
    replied
    Originally posted by CLaNZeR View Post
    Harvey you trying to say I am Predictable LOL
    LOL

    I had this nagging feeling that I forgot to answer a post somewhere - yep sorry for the delay.

    I just figured you would have fun building something that didn't have a ton of wires hanging off of it needing current probes to be properly placed at precise distances and high perm toroids

    I always admire your work

    And now, I'm learning Jet and Cody and Reiyuki, have skilz with metals too

    Hope someone gets something soon - not getting to see what David sees is really starting to make me anxious - I might have to get CatLady to build me one so I can look at it up close
    Last edited by Harvey; 05-18-2010, 06:54 AM.

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  • Harvey
    replied
    Originally posted by Bruce_TPU View Post
    Hi Harvey,

    Please take a look at the second picture!! I have blown it up. Look carefully at the top of the pipe pieces. The rotor is not moving! It is in the exact position as the first picture! Look at how clearly defined the grass...

    It appears to be a near perfect circular distortion...

    What say ye?

    Cheers,

    Bruce

    Leave a comment:


  • Reiyuki
    replied
    Here's my progress. No proper attempts to energize yet, still need to bend more steel. I'm trying to keep as close to the original spec as possible: 2" Galvanized steel Sch40, partly sanded.



    -Reiyuki
    Attached Files

    Leave a comment:


  • marseye
    replied
    Just a question

    Hello David,

    Being silent doesn't mean that I'm not very curious about what you're describing. But having no mean at hand to make any test, I'm just waiting forward for other people's attempts... Or to just see what you see from your
    videos and photos.

    And about the two pictures above : is the blur of the wheel because it was rotating, or... ? Since if it's spinning, you then managed to take 2 pics at moments when the wheel is in the exact same position ! Or I'm wrong ?

    I just ask, with the hope that these pics clearly may show at last what you're claiming with such enthusiasm. Keep the faith for your (re)discovery.

    Leave a comment:


  • Bruce_TPU
    replied
    Hi Harvey,

    Please take a look at the second picture!! I have blown it up. Look carefully at the top of the pipe pieces. The rotor is not moving! It is in the exact position as the first picture! Look at how clearly defined the grass...

    It appears to be a near perfect circular distortion...

    What say ye?

    Cheers,

    Bruce
    Attached Files

    Leave a comment:


  • rave154
    replied
    JET, great work on those prototypes

    dont forget to also try having the copper of the coil touching the actual steel (or whatever materials your using ) of the rings.

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  • nat1971a
    replied
    Magneto---is composed of 16 "V" shaped permanent magnets, mounted on, but magnetically insulated from the flywheel, and sixteen coils wound of insulated copper tape, one quarter of an inch wide and .015" thick, 25 turns to a coil, mounted on bosses on the magneto frame. The coils are wrapped with cambric, with fiber inserts in the center, and bristol board insulating washers beneath when mounted on the bosses. The coils are connected with the winding of consecutive coils in opposite directions.
      Magnets---are mounted with similar poles of adjacent magnets together making 16 magnetic poles each, having twice the strength of a single magnet pole, so in each revolution of the flywheel the magnetism in the boss of each coil reverses sixteen times, producing sixteen electrical impulses, which at ordinary engine speed produces a continuous alternating current of a much higher frequency than is used for house lighting. Because of this fact it is possible to operate lights from the magneto.
    The Coil Unit
      The coil unit consists of a soft iron core, primary coil, secondary coil, condenser, and the upper and lower bridge. The coil unit is also called an induction coil. Induction is the process by which a current is produced in one wire by another current running in another wire, near the first but not touching it.

    Construction---The soft iron core is made up of 160 to 170 pieces of No. 20 Swedish soft iron wire and well insulated from the primary coil, which is wound around it, by a heavy paper tube in which the core is packed.

    Primary Coil---is made up of two layers of No. 19 insulated copper wire, the first layer having 112 turns and the second 110 turns. The primary coil is then impregnated in hot paraffin and rosin for 20 minutes. This cements the pieces of wire in the core together, insulates and holds the windings of the primary in place.

    Secondary Coil---is composed of 16,400 turns of No. 38 enameled copper wire, and between each two layers are three layers of paper insulation. The coil is wrapped in two spools with forty-one layers on each spool. The reason for building the coil in two spools is because there will not be as many volts difference between the consecutive layers at the same end of the coil as if it was wound in one spool. By wrapping in two spools the difference in voltage between the consecutive layers at the same end is just half as much as if it was wound in one spool, and consequently, the thickness of the insulation between the layers is reduced one-half and the diameter of the coil is reduced proportionately. The secondary coil is then placed in a vacuum tank for twenty minutes at 220 degrees F. to make sure all moisture is drawn out; then it is submerged in hot wax. A heavy piece of wax paper is wrapped around the primary coil and it is placed within the secondary coil, making the induction coil complete.


    Here's the link
    Ford

    Leave a comment:


  • Michelinho
    replied
    Hi all,

    A picture is worth many many words. Here is what the core looked like in those good old days. I did squeeze it with a little twist so the wires show.

    Take care,

    Michel
    Attached Files

    Leave a comment:


  • ewizard
    replied
    Has anyone noticed in a couple of david's videos when the PMH is spinning that it looks like it suddenly freezes for a millisecond? I think it seemed to happen most often when he holds the quartz over it. I don't know if it's just youtube, video hickup or possibly some effect from the PMH.

    Leave a comment:


  • Harvey
    replied
    Originally posted by nat1971a View Post
    @jet

    In my notes of the ford ignition system it is mentioned that the core of the coils in the ford Model T is made of soft swedish iron no. 20. I would assume it is the same for the magnets but who knows. Leedskalin always talked about using soft iron as it would produce the most magnets. I will post the link later with the exact details.

    Cheers
    Nat
    I've read that also, in fact I think it said it was made of soft Swedish Iron wire no. 20.

    The thing is, soft iron is great for magnetic cores where induction is wanted but horrible for permanent magnets. The domains in soft iron revert easily losing the magnetic effect. A hard magnet (permanent) needs to not do that. Instead, you want the domains to remain locked in the magnetic orientation even after the H field is removed.

    Leave a comment:


  • nat1971a
    replied
    @jet

    In my notes of the ford ignition system it is mentioned that the core of the coils in the ford Model T is made of soft swedish iron no. 20. I would assume it is the same for the magnets but who knows. Leedskalin always talked about using soft iron as it would produce the most magnets. I will post the link later with the exact details.

    Cheers
    Nat

    Leave a comment:


  • ewizard
    replied
    Either that pic is showing some of the strange effects of the PMH or it was an odd combination of a wide angle lens camera being held very close to the PMH and a little to the right of center with the camera tilted slightly to the left. I think that might explain the distortion if it's not the effects from the PMH.

    Leave a comment:


  • Harvey
    replied
    Attached Files

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