The U.S. Patents of Nikola Tesla

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cer­ tain respects this plan including both armature and field coils circuit, marked 80 improvement., ASSIGNOR THE TESLA ELECTRIC COMPANY, SAME PLACE.,the said circuits or 25 branches, giving the circuits different self-inductive capacity, and other ways. In the former case, which the necessary difference phase primarily effected in the generation currents, have, some in- 30 stances, passed the currents through the en­ ergizing-coils both elements the motor— the field and armature; but have made the discovery that new and useful result or may obtained doing this under the con- 35 ditions hereinafter specified the case of motors which the lag, above stated, is artificially secured. When alternating current passed 70 through this motor divides between its two energizing-circuits. In illustration the nature this inven- \o tion shall refer the accompanying draw­ ings, which— Figures 1to 6,inclusive, are diagrams dif­ ferent ways which the invention may be carried out; and Fig. A Fig. NIKOLA TESLA, NEW YORK, Y.higher self-induc­ tion one circuit produces greater retarda­ tion lag the current therein than the other. The motor thus constructed exhibits, too, better regu­ lation current from load load, and 90 there less difference between the apparent and real energy expended running it. ApplicationfiledM ay 20,1889. Such motor has good torque starting; yet has also considerable tendency synchronism, owing the fact that when properly constructed the maximum magnetic effects both armature and field 85 coincide—a condition which the usual con­ struction these motors with closed arma­ ture-coils not readily attained. The difference phase between the 75 two currents effects the rotation shifting of the points maximum magnetic effect that secures the rotation the armature. 311,413, Q S T om odel. One the general ways which have fol­ lowed carrying out this invention pro­ duce practically independent currents differ- 20 ing primarily phase and pass these through the motor-circuits. Circuit coilA connected in series with circuit coil and the two circuits are similarly connected. This invention pertains that class elec­ tro-magnetic motors invented which two more independent energizing-circuits are employed, and through whichalternating 15 currents differing phase are passed pro­ duce the operation rotation the motor. The opposite terminals the field-coils connect one binding-post the motor, and those the armature-coils are similarly 60 connected the opposite binding-post i through contact-ring brush Thus each motor-circuit while derivation the other includes one armature and one field- coil. this present in­ vention resides. Fig. For the sake clearness have shown one of these circuits artificial resistance R and the other self-induction coil S. There this case but one armature-coil the winding which main- . ELECTRO-MAGNETIC MOTOR. indicate the two energizing- 50 circuits motor, and two circuits on the armature. Another way pro­ duce single alternating current, divide it between the motor-circuits, and effect, arti­ ficially lag one of. ring cl and brush similarly connect coils and D.nited States Patent Office. side view a 45 form motor which have used for this purpose. The true synchronous speed this form motor is thatof the generator when both are alike— that say, the number the coils 95 the armature and the field the motor will run normally the same speed gen­ erator driving the number field-mag­ nets poles the same also x. These circuits are different self-in- 65 duction, and may madeso various ways. The diagrams detail will described separately. shows somewhat modified arrange- 100 ment circuits.) To all whom concern: Be known that Nikola Tesla, sub­ ject the Emperor Austria, fromSmiljan, Lika, border country Austria-Hungary, re- S siding New York, the county and State of New York, have invented certain new and useful Improvements Electro Magnetic Motors, which the following specifica­ tion, reference being had the drawings ac- io companying and forming part the same. SerialN o. The. SPECIFICATION forming part Letters Patent No. 416,191, dated December 3,1889. Be­ tween coils and contact-ring form­ ing one terminal the latter, and brush 55 forming one terminal the former