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Nikola Tesla

Smiljan, Lika (Austria-Hungary)    9.July.1856-New York 7.January.1943
Induction Motor  (1887)

American physicist of Yugoslavian origin, famous for its studies, on the alternating currents to most vhf, “Currents of Tesla”, and on the theories and licenses of induction motors. He realized the first electric motor to induction to alternating current.    


trasformatore tesla
It is a transformer created from Nikola Tesla around   1900   in order to obtain high tensions, with low power, in alternating current.  Consta of a cylindrical vase of glass, of 50 cm of height and 16,5 cm of inner diameter, that contains the two windings,   secondary head physician and, dipped in mineral oil for the isolation. The primary one is formed with 12 coils of copper thread,    of the diameter of 5 millimeter, wrapped over one cylindrical tube of glass of the external diameter of 55 millimeter Has one resistance to the clips   R1 = 0,0023 ohm   and an inductance   Equal L1 to approximately 2 uH.   Secondary, the external one to the head physician, millimeter is formed with approximately 380 coils of copper thread of the diameter of 0,2,   isolated and wrapped over a tube of cylindrical glass of 113 the external diameter of millimeter.   Ohm has a resistance to the R2 clips of 70 and a L2 inductance of approximately 5,5 mH. Feeding the head physician with an oscillating circuit, constituted from a spark gap and a condenser in series,    excited in its turn they give
a battery or from an electrostatic generator, the tensions many elevated to vhf and spark of remarkable length are obtained between the ends of secondary. The frequency is between 10,5 and 10,6 Hz   and it depends from the resonance conditions of the oscillating circuit,    also the value of the tension to the secondary one not only depends from relationship N2/N1    between the number of secondary and primary coils, but also from the resonance conditions of the circuit.        The apparatus is served, to its times,   under consideration of the electric oscillations to   vhf   and to the observation of the first curious consequences of the skin effect.
L. Graetz: Die Elektrizitat - Engel horn, Stuttgard, 1903, p.280