7/28/2019 Electrical transformer or inductiondevice. Teslapatent.pdf

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( N () M () (1 e l . ) N . T E 8 L k ,sluEcTalczla TIAXSFOIIMkR 0It IXDrCTION nnvlcE.No. 433,702, Patente Atlg. 5, 1800,

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U kl-rso STA-I-SS PA-I-EK'I- O Fylcs.Nllf OLA TESLA, OF NEW YOR1f,N . Y., ASSIGN OR To TIIE TESLA ELECTRICCOAIPANY, OF SAAIE PLACE.

ELECT RICAL T RANSFO RM ER O R IN DUCTIO N D EVIC E.SPECIFICATION forming paz't of Letters fatent No. 433,702, date:l A>agust 5, 1890.lprlicatian Eled Xarch 2($1 1000, Sezisl Nb, 2451290, tN0 m0&l.)

Io tZCJ zfvztpn, JJ psfzv cozzcczw .. produced, pass tllrougll the two tsi ruits of thee it known that 1,NIIIOLA TESLA.,a sub- motor, a diterence of pha'se of uinety fle-ect of the Empel-or of Austria-llungary,from grees ; or, in other words,the curfent il1 0nemiljan, Lika, bord(.)r country of Austria- circuit should be maxilullrn when that in the5 l-lungary, resitling at New Aropk,in the eounty other eircmit is m inimum . TO m ore perf ctly 5nd State of hVew Arork,have invented certain attain to this condition I obtain f)la secure altnew antl usef ul Tmprovemekts in Electrieal iucreased retardation of the secondary cur-ransformers or Tnduetion Deviees,of wllifzh rentin the followiug mannel-:lnstetul of bring-he following ts a specif'cation,refere. nce be- ing the primary and secondary ctoils or cir-illg' 11a(1 to tlle d rawings accompanyi ng and cuits of a transf ormer into the closest possi- 6ormina a part of tlle sam e. ' ble relations, as has hithertobeen done, T p1*()-his invention is an improvem ent in elec- tec

,t in a measure the secontlary f 1-0111 the in-rieal transf ormers or converters, and has f r (lt4ctive aetion or effect of tlle primary by surits main objects the provision of means f r se- rouuding either the primal-y or the seeondary. curing, first, a phase diffe'rence between the witll a comparatively-thin magnetic shield ()t' 65rimary and secondary currents adapted to screcn. Under these conditions or circum-lle operation of my altemzating-cttzrrent mo- stalzees,as long as the prim ary etIrrettt 14as aors and other like purposes, and, second, a small value,the shieldproteets the secondary;onstan.t current f or a1l loads i mposed upon but as soolz as the primal'y current has reaehedo tlze seccmd

ary. a certain strength,wllicll is arbitrarily deter- 7on transformcrs as eonstructed now and mined,tllelnl-otectillglza>glleticshielclbeconleseretofore it will be f ount that the electro- sattzratetl allql tlle infltlctive actiorl t1poll theotive fol-c: of the secondary very nearly co- seeotldary begins. Itl-estlltsltllel*eforeltllattllencides with that of the primary,being, how- secondary cuz-rc.nt begins to flow at a certain5 ever, of opposite sign. At tlle same time the f raction of a periotllater than itwoulc'l without 75urrents)both primary and secondary,lagbe- the interposecl shield,ancl since this retarda-incl their respective electro-motive forces; tion may be obtaine.cl Avithout necessarily.re-ut as this lag is praetically or nearly the tartling the primary current also, an addi-am e in tlle case of eacll it follows. that the tional lag is sectlred, ancl the time interval be-aximum and m inimum of the primary and tween the maximum or lzlinimum period.s of 8oeeondary eul'rents will neal'ly coii-tcide, but the primary antl secondary currents is in-iler in sign o1- directicm, provided tho sec- creasetl I have f urther discoverecl that suchondary be not loatlecl or if it contain devices a transf rm er may,by properly proportion-aving the propezty of self induction. On ing its several elements ancl tleternzining il1the other hand, the 1ag of the primary behind a manner well understood the proper relations 85he impressed electro-motive f rce m ay be (1i- betweeu tlle primary and seeondary wintlings,linishecl by loadingthe seeottdary witll' a 14014 the thickness of tllc magnetic shield, anfl othernductive or dead l'esistauce .- such as incan- conditions,be ccmstructecl to yield a constantlescent lamps whrebythe time intervalbe- eurrel't at al1 loads. N o preelse rules can .bceen the maximum or the miuim um periods givcll 'fo'.r the specifi.c construetion a1Atl pro- 9oof the primary ancl secondary eurrents is in- portions for sectlriny the best results, as tllisreased. This time interval, however,is lim- ls a m atter determlned by experipent anclted, a'lttl tlle results obtained by phase dif- ealeulatioll in partieula,r cases; but the gen-erence in the operation of such devices as eral plan of construction which I have de-m y alternating-cum-ent motors can on'y be scribed will 'be fouud' under all conditions to 9.5pproximately realized by stlell lneanb of pro- eolltltwe t the attaiumeut of this result

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21ar view or a mod i fled forf' of tleansf rmer, tor, oue of the ircuits being colllleeted wishowinx' diagram matieally the manner of the znain circuit f rom the sotlrce E, and thusing the same. ' other being supplied with ctlrrents f roln thA A is the inain core of the transf rmer, secondary of the transf rmer.s composed of a riny of sof t annealed antl insu- l-aving now describecl my inventon, whlated or oxidized 11-01) wire. Upon this core I claim isis wound the secondary circuit or. coil B B . 1. In an electrical transformer or inluctioThis latter is then covered with a layer or device, tlle combination, with the main malayers of auhealed and irlsulated iron wires 'netic core and the primary aud secondar

Io C C, wotlnd in a direetion at right angles to coils or eircuits, of a l'agllet-e shielcl or scresaicl secondary coil. Over the whole is thell interposed betweell said coils, as herein swotlnd the prlmary eoil or wire D D. From f orth. , the nature of this eonstructitm it will soon ' 2. In an electrical trallsformer or inductibe obvious that as long as the shield formed device, the eombination: with the m agnett.s by the wires C is below magnetic satlzration core and the primary arld sectlndary coils the secondary coil or circuit is effectually pro- circuits, of a l'nagnetic shielcl ()r screell sutected o1i shieldecl fl.om the indllctive influ- rotxnding one of said coils onlyj as set fortence of the primary, although 1 would state 3. In an electrical transformer or intluctithat on open cireuit it lnay exhibit solne elec- device, the combination, witll the magnet2o tro-m otive force. A'Vhen the strength of the core allc'l the primary and seconclary coprimary reaehes a certain v/tltle, the shield C, wouud thereons of a magnetie shield or screbecoming sattlrated: ceases to plrtect the sec- wouncl t)n t)r built up al-ound one only of sa

ondary f om ind tzctlve aetion, autl eurrent is coils, as deseribed.in consequenee developed therein. For simi- 4. ln an electrical tranjformer o1* indtzcti2,5 lar reasons, wheu the primary current weak- device, the combination, with a m ain lamens, the weakening of the secondary is re- nated magnetic core and primary and secontarded to the same or approxi mately the sam e ary coils'thereon, of a .stlbdiviclecl or lamoxtent. , uated magnetic shield or screen interposThespectillc ctmstruction of the transformer between the coils, as set forth..3o is largely 'immaterial. ln Fig. 2, for exaln- 5. In an electrical transfo' rmer, the eomple, the core A is built tlp of thin insulated natiou, with a,magnetic eore and primairon plates or disks. The prim ary eireuit D and secondary coils wound thereon , of a lnais wtm nd next the core A. Over ths is ap- uetic sllield or screen interposed betweplietl th e shield C,'whieh in this case is made said coils ancl surrouutling one of them an,35 up of thin strips or plates of iron properly adaptecl to be or capable of being magnetinsulated and surrounding the primal'y, f rm- ally saturatecl by 1t, predeterluined curre

ing a closecl magnetic circtzit. The setzoll- strength belosv the maximum in the primardary .B is woulzd cn-er l,1)e shield C. In Fig. as set f rth. '2 also E is a source of 'alternating or rapidly ' a xl : ' Ynts. The primary of the trans- XIKOLA 7 ESL 4o changlng ctlllfornler is conueetecl witll the cireuit of the Nvitnesses:generator. ROBT. F. GAYLORD)'F is 11 two-cil'ctzit alternati ng-eurre nt mo- PARKER JV. PAGE.

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