Tesla’s Patent Revealed



As quoted by Tesla in this patent,  “In the description of the invention is designed for converting a continuous or direct current into one of high frequency.” , this can be interpreted as using 120/240 AC to Battery/Rectified as the electrical power source.

This part is describing how he uses a large induction coil and a rotary commutator for his switching circuits to create his pulsed energy,  “I have employed a circuit of high self-induction connected with the mains from a suitable source of current and containing some form of circuit-controller for periodically interrupting it.

The following is very important as Tesla only used a commutator to switch and didn’t use the modern equivalents such as transistors and diodes.“Around the break or point of interruption I have arranged a condenser, into which the circuit discharges when interrupted, and this condenser is in turn made to discharge through a circuit containing the primary of a transformer, and of such character that the condenser-discharge will be in the form of an extremely rapid succession of impulses.”

This part is the essence of his genius, by charging in parallel and discharging in series, Tesla increases the voltage potential available, “I subdivide the condenser necessary for storing the energy required into integral parts or provide independent condensers, and employ means for charging said condensers in multiple and discharging them in series through the primary of the transformer.”

The items F F are self-induction coils placed beside the motor. Above these is the transformer, composed, essentially, of primaries G1 and G2 and a secondary H.

L L designate the mains, between which a circuit is formed, including the self-induction coils F F and the commutator. The switch d may be employed to bring either or both of the coils F F into this circuit.

The commutator is built up of insulated plates or segments, upon which the positive and negative brushes bear, and these plates may be considered as belonging to three sets or classes:

1 – the plates m for what may be considered as the positive brushes D D1 in one row, electrically connected together, and the corresponding plates n for what may similarly be considered as the negative brushes E E1 in the other row.

2 – the plates o, which lie in both rows, and hence are conveniently made in single pieces extending across the controller.

3 – the idle or spacing plates p q, which are interposed in each row between the other two sets.

The brush D of one set is connected with one main through the coils F, and each one of the brushes of the same set is connected to one of the terminals of the condensers M N, respectively. Similarly the brush E of the other set of brushes is connected to the opposite main and each of the brushes of said set to the opposite condenser terminals through the primary or strands of a primary G1 or G2.

In the position of the parts shown in which two positive and two negative brushes are shown, the brushes are bearing on plates m m and n n. Consequently the circuit through the coils F F is through the condensers in multiple, and assuming that energy has been stored in said coils, the condensers will thus be charged.

If now by the movement of the commutator plates or brushes the latter are shifted across the idle or spacing plates p q onto the long or cross-connected plates o two results follow:

1 – The mains are short-circuited through the coils F F, which therefore store energy, while the condensers are connected in series through the primary coils G0 or G1.

2 – The condensers being charged in parallel when the brushes are on plates m n and discharged in series when the brushes pass onto plates o.

Diagram 1 – I redrew the main patent for clarity

Diagram 2 – These are the basic 3 action as the brushes change the configuration.

Diagram 3 – The Commutator schematic

Diagram 4 – How the Commutator is set up in 3D at the end of the motor.

I hope this helps in the understanding of Tesla’s methods used to create high frequency and high voltages without transistors, diodes or tubes.





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5 Responses to “Tesla’s Patent Revealed”

  1. selim dumlu Says:

    Hi Arto
    Thank you for your worty sharing .You have mentioned that your book is shortly available .Please give some info about this book could we see some examples about these patents?And where can we purchase this.Thanks in advance

    Liked by 1 person

  2. Aal Says:

    Hi Arto

    Thank you very much for your excellent works and contributions.

    I still can not understand the idle or spacing metal plates p q !! what if we eliminated the metal and kept the insulation spacing only? what would be the effect? Or are they necessary for some sort of spark gap action??

    On the other hand, the original patent has D3, D4 (D”, D”’) and E3,E4 (E”, E”’) would this mean we should also have another set of capacitors (N’,M’) and coils (G3, G4)

    Liked by 1 person

    • artojh Says:

      Hi Abdulaal,

      Thank you, you have looked at this with a keen eye, my simplified version is the basic patent description, much less complex than the final design.

      The idle spaces are an artifact of the design process, where they could be used as indicators of RPM or even connected to gauges. Tesla always leaves enough room to modify and add new design elements.

      The mechanical finalization of Tesla’s patent idea has 32 commutation breaks, he only illustrates 8, while the E, E1, E2 and E3 brushes are not shown on his Engineering cross-section, you must extrapolate the rest, which does include more capacitors(M1,M2,M3,N1,N2,N3) and more primary coils (G3,G4,G5,G6,G7,G8).

      Regards Arto.


  3. Aal Says:

    Thank Mr. Arto for your comprehensive answers.

    Your are very very right. Now I understand why there were eight primary cores and one secondary in the apparatus of this patent at Tesla museum

    Thank you for enlightening us and reviving Tesla works and many other arts. Please keep on with your distinguished contributions.

    Liked by 1 person

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