: --Previous Message--
: Hi Bert,
: thank you for your answer.
: At this time my main problem is,
: I have to wind the extra coil(TC),because the weather is good.
: The extra coil should have dimensions: 12,44"diam.x
: 58.17"length 1025 turns closewound AWG16 ohms
: or can I also use: 12.44"diam.x61"length 1075 turns closewound
: AWG16 13.5ohms
: (I would prefer this)
: two stage toroid (one elevated) planed
: Could I use so many turns for an effective extra Coil !
: The other construction data´s are not calculated exactly.
: Second./driver: 53.1" diameter 3mm spacing 24.2"length AWG16
: 142turns ~30.5mH ~2000ft wire
: You wrote that 3mm will not be sufficent.
: But if I have a greater distance,say 5mm I need for same Inductance
: more wire and more turns.
: example: 53.1" diam. 5mm spacing 42"length 168 turns!! 30.5mH
: 2330ft wire.
: More turns in driver means more voltage stress.How could
: this stress minimized?
: Why caculate magsim L2=30.5mH and the design formular and don´t give
: The sec./driver wire should be welded in Polyetylene and possibly filled
: with oil.On the top winding should be a Toroid.
: The primary: 59"diam 0.47"copper-tubing 1.06"spacing
: 10turns 15.7"high helical
: Above the top winding should be an isolated rim.
: The planed power is around 10KVA.
: The planed magnifier system could look like in the Tesla
: Patent:1,119,732 Dec1914
: best regards and thank´s for your short time.
: I see very little difference between the two tertiary coils - select your
: In my earlier response, I misunderstood the meaning of the 3 mm clearance.
: I interpreted it as the diffence in radius of the primary and
: secondary/driver coil. I now realize you were describing the air clearance
: between adjacent turns. The larger diameter of you secondary/driver should
: work very nicely and the 3 mm spacing should also be OK (assuming
: sufficient clearance between the secondary/driver and your primary).
: However, the 3" clearance between the primary and secondary/driver
: will not be sufficient unless you immerse both the primary and driver in
: oil. Just immersing the secondary/driver in oil will merely increase the
: stress in the air gap between the primary and the container holding the
: secondary/driver, leading to excessive corona and eventual puncture.
: The most difficult part of magnifier design is simultaneously obtaining a
: high coupling coefficient AND high voltage standoff capability between the
: primary and your secondary/driver. Tight E-field control and prevention of
: initial corona are essential. You may want to consider increasing the
: primary diameter as you go up in height - making it a conical shape to
: provide more clearance to the secondary/driver to withstand the greater
: voltage stress. You could also decrease the clearance at the base of the
: primary where the voltage stresses are lower. This should maintain tight
: "k" while increasing overall primary:secondary breakdown
: Remember that the numbers of turns on various windings and turns ratios
: have little bearing in the theoretical analysis of magnifier designs since
: the theory deals with how energy can optimally transfer between the
: primary, though the various inductances and capacitances in the system, to
: the teriary coil. How one practially achieves the appropriate inductances,
: coupling coefficients, AND voltage stress capabilities are practical
: design and ngineering challenges that are beyond the capabilities of the
: current analysis that magnifier design tools provide. I'll review the
: design parameters above and get back with you as soon as I have a bit more
: time. You may also wish to review your proposed design with Antonio Carlos
: M. de Queiroz (firstname.lastname@example.org) since Antonio is currently the person
: who's most knowledgable about magnifier design theory.
: Best regards,
: -- Bert --
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