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Aluminum Square Tubing Primary Inductances?

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  • Harvey Norris
    As mentioned some time ago, I am exploring a concept using square tubing as the primary. It became necessary to construct this as a pentagon, using 1 ft by .5
    Message 1 of 1 , May 13, 2008
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      As mentioned some time ago, I am exploring a concept
      using square tubing as the primary. It became
      necessary to construct this as a pentagon, using 1 ft
      by .5 X.5 in dimensions. Five winds have been
      connected in such a way that the pattern resembles a
      horiz and vert lateral cross; with the central wind
      being one set, and winds 1-4 being another set, where
      the central wind uses its entire surface area,(5 *.5 *
      4)= 10 sq inch as the internal capacity of the
      (primary)coil itself. The insulation between the winds
      is a combination of superglue and PVC Radio Shack
      Megacable speaker wire, that itself spirals around
      this central wind for a total of (5 * 4 = 20) turns
      around the pentagon. Thus an additional interweaving
      set of winds is available for the purpose of measuring
      a "lorentz force interaction" between the central and
      outer windings. This should only be the case if the
      current directions between the central wind and the
      outer winds are in opposition, thus reducing the
      inductance of the primary. But in this case both the
      magnetic fields of the individual outer conductor
      winds and the central one will be in magnetic
      agreement on adjacent conductors, and both a
      orthogonal electric and magnetic field should be
      present to move the free electrons of the speaker wire
      on the third right angle of space as the interweaving
      wire is laid. The problem now becomes the LCR meter
      readings accuracy, as this is a low end of inductance
      measurement, and does not correspond the what
      mathematical Wheeler equation type predictions yeild.
      If the primary were operated with all five winds
      in agreement the Wavetech LCR meter reads 32.7 uH, and
      for the central wind being opposite it reads 17 uH.
      The intention here is to employ the arc gap IN SERIES
      with the central winding, or within the primary coil
      itself and not external to the coil as other designs
      dictate. The midpoint open circuit break LCR C
      reading seems high; .472 nf, perhaps the superglue has
      a high dielectric constant.

      Thus we might suspect that operated in magnetic
      agreement with the L and C values of 32.7 uH and .427
      nF: the arc gapped resonator should yeild a frequency
      of ~ 128 khz, but this does not account for the fact
      the every changing electric field has a counterpart
      magnetic field at right angles to itself, and this in
      turn might change the acting L value of the primary.
      Other larger scale measurements of this (magnetic flux
      capacitor) effect at lower frequencies suggest a 10%
      deviance from the book calculated R(f) value, but the
      direction of the deviance for this case is unknown,
      where ordinarily this is determined by the polarity
      connection of the capacity inserted into the
      orthogonal space of the resonating inductors magnetic

      For that unique case of (1/5th)external magnetic
      cancellation, but internal magnetic unity using 17 uf,
      the resonance formula yeilds a very high figure of
      ~1,777,000 hz. Now the problem becomes comparisons to
      formulas. Using an average between 18 in. and 20.5
      in. diameter as the pentagons closest and farthest
      pts. and the formula
      Uh= .8(R^2N^2)/[6R+9L+10B]
      Where dimensions given in inches are used and have the
      R = 9.625 in
      L = 2 in.
      B = 2 in

      I arrive at a value just under 1 uH, about a 33 fold
      error according to LCR meter. Do folks think the LCR
      meter is wrong? Are formulas obscured by the unusual
      geometry being employed here?

      Sincerely Harvey D Norris

      Tesla Research Group; Pioneering the Applications of Interphasal Resonances http://groups.yahoo.com/group/teslafy/
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