Tesla's "COIL FOR ELECTRO-MAGNETS".

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An LLC tank of two pancake coils and one variable capacitor could be powered by a D.C. power source and potentiometer. Bifilar pancake coils of 20 gauge, 4 inches in diameter match a specific capacitance for 180 khz. Two controls, a variable capacitor and power potentiometer to regulate the precise frequency and amplitude of the oscillating sine wave to match the magnet's resonating frequency. Only a few cheap components!


"Coler also invented another device called the Stromzeuger (Current Generator). He claimed that, "with an input of a few watts from a dry battery an output of 6 kW could be obtained indefinitely."

Six coil wrapped magnets, two capacitors and two solenoid coils, one sliding inside the other!


"Possibly the soft iron magnets which Coler used were subjected to such stress by ultrasonic magnetostriction from the coil windings at the 180 kHz resonant frequency".

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This kind of dual Butterfly Capacitor is an ideal component for the "Synchro Stromzeuger". From zero to a few hundred pico farads with the normal tuner coupled to a fine tuner in the 50 pico farad range: Maximum voltage is determined by the distance between the plates. The plates can even touch if insulated for the lowest voltage operational configuration. We only need to store and deliver around twenty volts. Capacitance is determined by the thickness and surface area of the plates.

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Voltage is independent of capacitance. Air gap "Butterfly Capacitors" are normally designed for high voltage tuning. The "Low Voltage" magnet wave variable capacitor needs to be a "Dielectric Capacitor" where the blades are compressed and separated by a high dielectric ceramic insulator. A thin film of Tungsten Carbide or Barrium Titanite coating between the snug aluminum conductor plates would work best.


Capacitors are additive in parallel, so the "Dielectric Trimmer" can be in the zero to five hundred pico farad range, and increase through coupling. I'm searching for a suitable manufactured type, but nothing has come to light as yet! The "Synchro Stromzeuger" may require this one custom built component.

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Factors affecting capacitance:


There are three basic factors of capacitor construction determining the amount of capacitance created. These factors all dictate capacitance by affecting how much electric field flux (relative difference of electrons between plates) will develop for a given amount of electric field force (voltage between the two plates):

PLATE AREA: All other factors being equal, greater plate area gives greater capacitance; less plate area gives less capacitance.
Explanation: Larger plate area results in more field flux (charge collected on the plates) for a given field force (voltage across the plates).

PLATE SPACING: All other factors being equal, further plate spacing gives less capacitance; closer plate spacing gives greater capacitance.
Explanation: Closer spacing results in a greater field force (voltage across the capacitor divided by the distance between the plates), which results in a greater field flux (charge collected on the plates) for any given voltage applied across the plates.

DIELECTRIC MATERIAL: All other factors being equal, greater permittivity of the dielectric gives greater capacitance; less permittivity of the dielectric gives less capacitance. Explanation: Although its complicated to explain, some materials offer less opposition to field flux for a given amount of field force. Materials with a greater permittivity allow for more field flux (offer less opposition), and thus a greater collected charge, for any given amount of field force (applied voltage). "Relative" permittivity means the permittivity of a material, relative to that of a pure vacuum. The greater the number, the greater the permittivity of the material. Glass, for instance, with a relative permittivity of 7, has seven times the permittivity of a pure vacuum, and consequently will allow for the establishment of an electric field flux seven times stronger than that of a vacuum, all other factors being equal

The following is a table listing the relative permittivities (also known as the "dielectric constant") of various common substances:


Material        Relative permittivity (dielectric constant) ============================================================


Vacuum ------------------------- 1.0000


Air ---------------------------- 1.0006


PTFE, FEP ("Teflon") ----------- 2.0


Polypropylene ------------------ 2.20 to 2.28


ABS resin ---------------------- 2.4 to 3.2 Polystyrene -------------------- 2.45 to 4.0


Waxed paper -------------------- 2.5


Transformer oil ---------------- 2.5 to 4


Hard Rubber -------------------- 2.5 to 4.80


Wood (Oak) --------------------- 3.3


Silicones ---------------------- 3.4 to 4.3


Bakelite ----------------------- 3.5 to 6.0


Quartz, fused ------------------ 3.8


Wood (Maple) ------------------- 4.4


Glass -------------------------- 4.9 to 7.5


Castor oil --------------------- 5.0


Wood (Birch) ------------------- 5.2


Mica, muscovite ---------------- 5.0 to 8.7


Glass-bonded mica -------------- 6.3 to 9.3


Porcelain, Steatite ------------ 6.5


Alumina ------------------------ 8.0 to 10.0


Distilled water ---------------- 80.0


Barium-strontium-titanite ------ 7500


This means Barium Titanite will produce an "Electric Field" nearly 7,000 times as great as air per volt!  Materials with a greater permittivity allow for more field flux to develop for a given amount of electric field force (voltage between the two plates).


Higher permittivity dielectric material will strengthen the field force of a low voltage power supply. We need this force to strengthen the magnet waves projected from the twin Tesla pancake bifilars. It should be simple enough to dip a few teardrop shaped aluminum capacitor plates in a Tungston Carbide powdered slurry of linear polyurethane, for a five plate trimmer!


The increased field force in the dielectric capacitor will strengthen the amplitude of the oscillating sine wave in the LLC magnet exciter tank.

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The dual Teardrop Variable Dielectric, set in a frame and a bath of mineral oil is in parallel with a DPDT switch that connects the capacitor to the D.C. power source, then connects the capacitor to the Tesla bifilars. The combined coil inductance determines the capacitance for the self resonant frequency, and the DPDT switch frequency is then based on the capacitor discharge rate, probably around a hertz. Power generated in the magnet output coil by the oscillating LLC tank sine wave between the capacitor charge cycles should accrue as gain!