USRE12223E - Alternating-current transformation - Google Patents

Description

Nd. iiza nmssimn MAY 24,1904. M. HUTIN .& M. LEBLANG. ALTERNATING CURRENT TRANSFORMATION.

APPLICATION FILED APR. 20' 1904.

witnmom $24M f7 UNITED STATES Beissued May 24, 1904.

PATENT OFFICE.

BY MESN E ASSIGNMENTS, TO PENNSYLVANIA.

GEORGE WESTINGHOUSE, OF PITTSBURG,

ALITEIIRNATING-CURRENT TRANSFORMATION.

SPECIFICATION forming part of Reissued Letters Patent No. 12,223, dated May 24, 1904.

- No. 754,371 dated March 8, 1904. Application for reissue filed April 20, 1904. Serial m5. 204,188.

To all whom it may concern: j Be it known that we, MAU ICE-Horn: and MAURICE LEBLANG, citizens of the Republic of France,'and. residents of Paris, in the department of the Seine, in the Republic of France, have invented certain new and useful Improvements in' Alternating-Current Transformation, of tion.

Our invention relates to the production of two separate alternating magnetic fluxes that arein quadrature and to the utilization of these fluxes for the generation of alternating currents i 1 It is within our invention to produce two which the following is a specificaseparate alternating magnetic fluxes in quadrature in any way or manner and to produce by the 'conjoint'inductive action of thesefluxes three or'more phase alternating currents, and it is also within our invention to produce two quarter-phase magnetic fluxes by three or more phase alternating currents, each acting' inductively upon twomagnetic cores in accordance with a sine and cosine law, respectively, I and to produce by the separate inductive influence of the two fluxes thus generated twohase alternating currents, and it is also withi 11 our invention to produce two-phase magnetic fluxes by two-phase alternating currents and togenerate three or more phase alternating currents by the conjoint inductive action of the two. fluxes Vupon' windings that are graduated in accordance with a sine and cosine Anembodiment of our. invention is illustrated in the accompanying drawing, which shows two inductional transformers wound and connected in accordance withour invention.

The drawing represents the case when either three-phase or two-phase currents are used for the production of two phase magnetic fluxes; but the application ofthe principles of the invention to any number of dephased currents will be clear from the explanation of the use ofthe-three-phase currents.

' In the drawing, 1 and 1 represent the cores of two converters, which cores, it will be understood, are inv practice closed upon themselves, generally ring-shaped, but which are here represented in part only and straightened out; Upon these cores are the coils 2a 2b 2.: and 2'. 2'1] 2%, which for the time being we will call the primary coils. They are of different sizes, as is represented by their different width, and'on each core two of these threecoils are'wound in one direction and one coil wound in the opposite direction, as is represented by differences of shading. The coils 2a, and 2., 2b and 2', 2c and 2E are connected together, respectively, in series by conductors 4a, 4b, and 4c, while the free terminals of coils 2 s 2' 2's are joined together. With the free terminals of coils-2.1, 2b, and 2c are connected the three line-wires 3a, 3b 30, re

spectively, conveying three-phase currents.

.lt Asin. 2

It:Asin. 2 1r( Under these conditions the incoming current L, traverses the code 2., and 2', the incoming current It traverses the coils 21, and 2H,, and the incoming current Iu traverses the coils 2c and 2'0.

As before stated, the different coils of the two converters are not of equal size. They are graduated for each transformer, so that the numbers of theinconvolutions are related to each other either as the sines or as the cosines of thearcs representing the lags of the incoming currents from some arbitrarily-se- 'lected current, Wlllle the convolutions of the conjugated coils in the two transformersnamely, 2. and 22., 2b and 2H,, 20 and Elk-are related to each other as the sines andcosines of the samearcsl These lags of the incoming currents from some arbitrarily-selected or assumed. current we shall hereinafter refer to simply as the current lag.. Following this rule and designating by 7 an arbitrarilyehosen constant number ofturns of coil-winding and by a any arbitrary constant quantity we make the number of convolutions for coil 29., 7 sin. 2 7! for coil 2k, 7 cos. 2 1! for coil 2h, 7/ sin. 2 n (a for coil 2%,? cos. 2 a

for-coil 2 0 7 cos. 2 F:(

l for coil 2t, 7 sin. 2

The number of alternating ampere-turns developed about the core 1 will therefore be 7A[sin. 2 sin. ka+

T sin. 2 v1N0: sin. 2 71 sin. 2 r: (a

)l 3 3 which expression maybe reduced to VA cos.-2

Similarly the number of alternating ampere-- Urns developed about the cor 1 in he gyAsin. 21r(% will also be dephased with reference to each other by one-quarter of a period.

It will now. be evident to those skilled in the art that if our general rule of winding and connecting the coils of two transformers-is followed we are enabled to produce by any number of dephased alternating currents two inde nmdentalternating magnetic fluxes,

which are dcphased with reference to each other by aquarter of 10a. Thus, as inand stance, if we use J currents they must be dephased with reference to each other by l of a period. These currents will therefore if ,9

I: A sin. 1!

11) sin. 1r I A sin. 1r

a l e 2 I.I 1 A Sin}. 2 s r l J'zAsin'. 2 I The number of windings of the primary coils on core Lwill then be in accordance with. the principle of our invention for coil 2., 7 sm. 2 71 for coil 2b, 1 sin. 2 K

for coil 20, y sin. A

for coil'zb, y cos. 2 1: (01+ for coil 2'6, 7 cos. 2.

for coil 2114, y cos. 27f

and l; I

for coil 2L1, y cos. 2 2

core 1' will be The ampere-turns dcvelopedabout the core corresponding alternating magnetic fluxes produced in the two cores will therefore be} dephased by one-quarter of a period, and so will the alternating currents thereby induced in any secondary coils 5 5 upon the-same 95 for coil 21.2, V sin.2 1: J2

loo

will then be V A cos. 2 and simi larly the ampere-turns developed about "the y A The phase currents that which heretofore could only be accomplished by two-phase currents namely, the production of two-phase magnetic fluxes. Moreover, the system is obviously reversiblethat is to say, by two-phase alternating magnetic fluxes, however produced, multiphase currents can be generatedwhich ord wxrily means the conversion of two-phase currents of any tension into three or more phase currents of the same or any other tension. In that case the coils 5 5' may be the primary coils and the coils 2;, 2t, &c;, become the secondary coils. 3

It is quite obvious'that for the'purposes of our invention the vcoils of the two transformers may be arranged upon'thcir cores in any suitable manner and that we are not limited to any particular shape or to any details of construction so long as the fundamental principles herein sctforth are observed.

Having now fully described .our invention, we claim and desire to secure by LettersPat- 'ent-- i. The method of generating electrical energy, which consists in producing two separate alternatingmagnetic fluxes in quadrature, and

generating by the inductive influence of these fluxes three or more alternating working currents, dephased with reference to each other,

substantially as described. i

- 2. The method of producing two separate alternating magnetic fluxes in quadrature, by

a greater number of dephased alternating currents,'which consists in passing each of the initial currents around'one of two separate magnetic cores in a number of turns proportionate to thesine of the current lag and around the other core 1n a number of turns proportionate to the cosine of the same .cur-

rent lag, substantially as described.

3. The method of generating three or more dephased alternating electric currents by two separate magnetic fluxes which are in quadrature, by subjecting three or more circuits simultaneously to the inductive action of the two fluxes, each circuit in the ratio of the sine of its current lag by one flux and in the ratio of the cosine of its current lagv by the other flux, substantially as described.

4. The method of transforming electrical energy, which consists in generating by the combined inductive influence of 'three or more phase alternatingcurrents two separate alternating magnetic fluxes in quadrature, substantially as described. 3

5. The method of transforming two-phase alternating'currents into three-phase alterhating currents, which consists in produclng two separate -alternatlng magnet c fluxes 1n quadrature by the inductive influence of the two-phase currents, and subjecting three circuits simultaneously to the inductive action of the two fluxes, each circuit in the ratio of the sine of'the desired current lag by one flux, and in' the ratio of the cosine of the desired current lag by the other flux, substantially as described.

6. The method of transforming three-phase alternating currents into two-phase alternating-.cnrrents, which consists in passing each of the three-phase currents around oneof'two separate magnetic cores in a. number of turns proportionate to-the sine of the current lag and around the other "core in a number of turns proportionate to the cosine of the same current lag, whereby two separate alternating alternating currents, substantially as described.

In'testimo ny whereof we have signed our names to this specification in the presence of two subscribing witnesses. 1

MAURICE HUTIN. MAURICE LEBLANC.

Witnesses:

ALBERT Dnnos, HANSON (J. Cox.

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