US1585389A - Inductance coil - Google Patents

Description

iiletented May 18, 1926.

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FIP-All I.. JDD AND ETHELBERT D. PlTT, GF NEW YORK, N. Y., ASSIGNRS, BY DI- kAND ASSGNMENTS, T CURKOID CORORJLIQN, 0F NEXV YDRK, N. Y.

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.application led November '.lhis invention relates to an inductance coil7 and has particular reference to one adapted for use With radio telephone and telegraph transmitting and receivingl devices, and circuits tor electric magnetic induction.

in object of the invention is to providea method of Windingl inductance coils Which will produce a better and more elilective distribution o'l the magnetic iield ot the coil.

rnother object is to improve generally the etliciency ot inductance coils Where high ciencies are necessary; especially in regard to the windings and the cieposition thereol so as to eliminate to as great an extent possible, what is termed end capacityl; and so as to increase to a maximum the volume of' inductive capacity oll the coil in relation to the size and length of Wire used.

Another object is to provide a loosecoupling with adjacent inductance coils'and thereby provide less distortion of the transmitted or received electrical current.

Another object is to reduce to a minimum the distributed capacity in the inductance coil.

Aanother object is to provide an inductance coil ot compact torni, with no end capacityj with a comparatively great volume ot inductive capacity relation to the and ength ot Wire used, and with a better and fiore effective distribution oi the magnetic ld ot the coil than has heretofore been ossible,

rlhese and other objects and advantages of our invention are set forth in the 'following description, taken in connection with the accompanying drawings. life disclose herein the best form or our inductance coil non7 known to us; but this torni is to be taken as merelytypical of numerous constructions in Which the principle ot our invention may be embodied and we reserve the right to make changes in the shape7 size and arrangement or" parts or the character ot the materials used, to the full extent indicated by the general or broad meanings of the terms in which the claims are expressed.

ln the drawings:

Figure l is a front view of our invention as mounted for connection with radio telephone and telegraph transmitting and receiving circuits.

Figure 2 is a partial section taken on the line lb oi' Figure l.

Figure 3 shows the geometric development ot the form ol' the coils.

ris shoivn in Figures l and 2 the devicl comprises an ecccntrically laid series ol in-` sulated copper magnet Wire coils l hold Within a ring traine 2 or any suitable dielectric material. The terminals ll are connected. to the conductive terminal posts o and set in the dielectric mounting 3 ot the coil trame Q. rihe terminal post 5 is in the 'form ot a plugja Ad the terminal post (i is in the form of a soclret so that the correct polarity ot the coil may always be maintained in relation to the electric circuit of which it becomes a part.

The coil. may be laid or wound with a single layer of loops or in a plurality of la l ers as shown, dependent on the radio wave length it is desired that the coil shall be capable ot receiving.

rllhe geometric torni or the coil is that of a basis of curtate epitrochoids as shown in Figure 3 Where the separate loops of the coil l are shown in development by la Within the circle 2a. rllhe loops la are lgenerated by the rolling oit circle 8 with its extended radius 9 on the exterior circumference or circle l0, this rolling being effected Without slipping. rlhe extension or the radius 9 ot circle 8 is equal to the distance from the center of 8 to 2a. T ie direction cit {generation is indicated by arrow heads. lli/*hilo in the actual practical operation of Windingl the coil on a machine developed :tor that purpose it may not be possible to Wind so accurately as to prevent some sligp say or S in rolling; on l0, yet it has been round that the individual loops or coil l are esseir tially of the exact torni ot a curtate epitrochoid or it a. curtate hypotrochoid of circle 8 be rolled on the interior circumference o'l circle lO.

lllle have found by actual experiment that the method of Winddng` shown enables a considerable broadening of the magnetic field o'l the coil in comparison with ua more or less tightly Wound coil such as the single layer solenoid banlr wound, or even the Well known honeycomb or duo-lateral types ot inductance coil.

With the particular Jlorm ot Winding shown, the magnetic i'ield is broadened and results in the reduction to the absolute minimum of the distributed capacity ot the coil.

The i'nctliod of winding' Shown makes clem' the 'fact 'that tlm laat layer wound will lie directly m llic magnetic flux field of l'lic lieii' inductive Strength is tliei'cbjy onlizmi'cfl. This eiinunccu'icn of inductivo sti'cngg'li on :iblcs a "locsc" typo of coupling' lo be Ulu-- primari l. As mi article ci iiiumx'ncluie :in iiiluclmice coll livvlug :L 'plurality cr" mop windings ci' a single coniiiiuons craiilxlczrn' arranged laterally cccci'ic ou@ with tlc other.

2. The combination in a coil 'loi' iimgnclic induction, of f1 plurality of loop wiin'li'l of u singley continuous conductor m.' long/2 which are gcnci'atcd iu thc geomelric form of :1 ti'oclioicl,

3. AS un article of nimm. L :m cluctmice coil lim'ing a plui'ali'ty oll layers of loop windings oi a Single coiil'nuouss con- (luctm', .:icli liyci' consisting' 0i u plurality of windings .fu'rnngi'Q-i'l laterally ecccul'i'ic mi@ with the other.

Ll. AS im article of manufactui'c au iii luc lance, coil com ijli'iseil m s. 'plum'. ity nl' lujyci'fv; 0i lomp windings of zi single connimwus cm1- (luctoi, che wiuiinlg'fs i1 @zich lzijfci' hiring; uw ccni'ic 0110 willi lic olxci' :mil lli/J lijui's being' coiiccni 'c with c: l1 clilxcx'. l

fai' un um l i a ici', lm conccmi'il' FEAR-@55 L. JUDD. ETHELBERT D. PTl.

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