The U.S. Patents of Nikola Tesla

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are short-circuited. When the motor has attained the desired 85 speed, the switch shifted!to the position shown dotted lines—that say, with the levers/ gresting onpoints ce. SPECIFICATION form ing art etters aten No. 811.) , all whom, concern': , Be known that Nikola Tesla, sub­ ject Ofthe Emperotof Austria-Hungary, for­ merlyof Smiljan,Lika,bordercountryofAus- 5 tria-Hungary, but nowresiding NewYork, in the county and Slate'of. These levers are . example, with the coils B 50 right ,angles.Qontacfa is-connected-to brush. The motor shown one the ordinary forms, with field-cores either laminated or Bolid and with cylindrical laminated arma­ ture wound, for.United Patent Office. ■In patent granted. The method operating electro -mag- 95 netic motors, which consists first progress­ ively Shifting or. When the motor thus started reached passes the limit speed synchronous with the genera­ tor, connect the coils previously short- 35 circuited with source direct current and bya change the circuit-connections pro­ duce simple alternation the poles. Thereare manyspecific: 40 ally-different ways which this may car­ ried out; but have séléctedonefor illustrat­ ing the principle.) . New York, have Invented certain Jiew and useful Improve­ ments Methodsof Operating ElectrorMag- nétic Motors, whichthe followingis ispeci- io fication, inference being had to. '“ • The present invention specific way of a5 carrying out the saine invention; anditcori-. 2. ferént diameters. (Komodel. This illustrated the annexed drawing, which side view a motor with diagram the circuits and de- 45 vices used the system.. ELECTRO-MAGNETIC MOTOR. The method operating electro-mag- . One, end of'coil connects one ring, as; ■ C, anidone end coil Bconnects with ring 55 The remaining. 90 The field-coils are thrown into circuit with the direct-current source when the1main switch shifted.two more in­ dependentenergizing-currents toá motorola eratedbya single current several acting as one.I progressively shift the magnetic poles one element field the motor alternating purrentsdifferiňginphase passedthrough 30 independent energizing-circuits and short- circuit the coils of-the other element. (Shown, for better illustration, dif-.ends areconnected ring E. .connected the linerwires from source alternating cur­ rents . Thisconnects up the two ármaturé-coils series, and the motor will then run'as synchronous motor.the magnetic poles of one element until has reached synch­ ronous speed and then alternating said poles and passings directcurrentthrough the coils icc of the other element, herein set forth.'rotating.420. 418,248, dated December 31,1889. wire Contacts and are connected tq brushes respectively,"through the wires / P and contact directly connected witfy 75 brush The lever has widened end'/ which may span the contacts When in such position and with lever contact d, the alternating currents divide between the two motor-coils, and reason their dif- 80 ferent self-induction difference current- phase obtained that, starts the motor ro­ tation. Application SledKay 30,1889. the drawing accompanyingandformiiigapartofthe same. Collecting springs brushes bear upon the rings and lead the contacts a switch,tobehereinafterdescribed. Thefield- coils have their terminals binding-posts 60 K, and may either closeduponthemselves or connected with source direct current L meaUsof switch The mainorcon­ trolling,switch hasfive contacts and ' two levers . N c COMPANY, SAME PLACE. sists the following -m'ethpd: the start.G and coll through dead-resistance and 70 wire :Contact0 Connected,with brush F and Bbil through self-induction-coilS and •.pivoted and connected 65 insulatingcross-bar h,eo move paral­ lelism. The shaft the armature carriesthree collecting contact rings D E. 401,520,1 have shown and described a method operating alternating-current mo- 15 tops first shifting rotating theirmag- netic poles until they had reached passed a synchronousspeedaud thenalternatingthe poles, or, other words,by transforming the motor byachaňgebf circuit-connectionsfrom ao one operated the action of. The motor then continues, run synchronism; with the generator. starting; have above stated, 'the field-coils.to ine April 1C , 1889, No. What claim herein invention is— 1. SerialHo