The U.S. Patents of Nikola Tesla

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such disposition, 25 shown Fig. the opposite conditions would exist. 20 such disposition that shown Fig. outline the general form of motor which have embodied this improve­ ment. Witnesses: Robt. In this case only one armature-coil, is included the line-circuit, while the other, as is, short-circuited. 2. 4—that say, io the two field-coils and two armature-coils are in derivation themselves and series with one another. 2, where only one armature-coil em­ ployed, the torque the start somewhat reduced, while the tendency synchronism is somewhatincreased. The armature-coils are wound to correspondwith the field-coils with respect to their self-induction. Fig. represents disposition which both armature and field are wound with two 5 sets coils, all multiple arc the line or main circuit.416,191 tains effects corresponding the resultant poles produced the two field-circuits. The armature-coils this case, as the previous figure, are wound for dif­ ferent self-induction correspond with the iS field-coils. In the above description have made use of the terms “armature” and field;” but 40 will understood that these are this case convertible terms, for wliat true the field equally the armature, except that one stationary, the other capable rota­ tion. 45 I not claim this application the method or means operating double-circuit motor by making its circuits different self-induc­ tion any way retarding the phases of current one circuit more than another, 50 having made these features subject other applications; but What claim is— 1. NIKOLA TESLA. In Fig. Gaylord, F rank tley. Fig. modification of this plan shown Fig. both instances, however, there the advantage dispensing with one contact-ring. Another modification shown Fig. Fig. 5. the two field-coils and-t'he arma- 30 ture-coil are multiple arc. 6 this disposition modified, coil being shown series with the two field-coils. alternating-current motor, the com­ bination, with field-circuits different self- 55 inductive capacity, corresponding arma­ ture-circuits electrically connected therewith, as set forth. alternating-current motor, the com­ bination, with independent field-coils dif- 60 ferent self-induction, independent arma­ ture-coils, one more circuit with the field-coilsand the others short-circuited, set forth. The circuit-connections between the 35 armature and field coils are made, indi­ cated the previous figures,through brushes and rings, which are not shown