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Publication numberUSRE11576 E
Publication typeGrant
Publication dateNov 24, 1896
Filing dateOct 31, 1896
Publication numberUS RE11576 E, US RE11576E, US-E-RE11576, USRE11576 E, USRE11576E
Original AssigneeThe general Electric Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
US RE11576 E
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

2 Sheets-Sheet 1.


2 Sheets-Sheet 2.



No. 11,576. Reiss-ned Nov. 24, 1896.


side by side in a'common frame.



SPECIFICATION forming part of Reissued Letters Patent No. 11,576, dated November 24, 189B.

Original No. 559,419, dated May 5, i896; .Application for reissue filed October 31, 1896. Serial No. 610,753l

To f//ZZ whom, it 12m/,zj concern:

I 5e it known that I, CHARLES P. STEINMETZ, a citizen of the United States, residing at Schenectady, in the county of Schenectady, Stat-e of New York, have invented certain new and useful Improvements in Inductor-Dyna mos, (Case No. 479,) of which the following a speci lcation.

My invention relates to dynamo-electric machines, especially those of the inductor type, now well known in the art; and it consists in the general type of machine by which I obtain a novel and useful apparatus, as Well as, in a more specific sense, improved details of construction which I have devised,by which the first cost of the machine maybe largely reduced, in that I am enabled to use va less number of eld-coils and field-magnet cores, and also to some lextent-to employ standard forms of apparatus made from patterns suitable for dynamos of other constructions. To this end I employ for my improved dynamo a field-m agnet of ordinary type--that is, having inwardly extending.,r laminated polepieces provided with ordinary windings. The pole-pieces, however, Isomewhat extend circumferentia1ly,and upon these extended polefaces I mount the armature-coils of the machine. Adjacent to these coils, which may of course be connected in any suitable relation to obtain current of one or more phases, the inductor revolves. In most inductor-dynames the indnctor consists'of a bobbiu-like structure, in section somewhat like the letter H, composed of two star-Wheels connected at their centers by a central body or shaft, about which a coil may be wound to determine the polarity of, the" mass. Each of those starwheels is ofdifferent polarity-that is to say, all thc projections on one are of north polarity and all on the other of south polarity, each one being provided with its own stationary armature, the' two armatures being'mounted My improved inductor dii'ers from those just described in that theinductor, although a single unitary structure, is when stationary of north polarity on one side of its diameter and of south polarity on the other side, the plane of division passing through its-axis of tor I.

stance, that lettered o..

revolution, or substantially so. 'lhusthc inductor projections, which in `ordnaryconstruetonsypreserve the same polarity during 'A the entire revolutiomin my improved arrange-A A ment reverse their polarity as they passfrom one field to another. I have described the construction as applicable toa bipolar structure, but-it may be used with even better effect in niultipolar apparatus, and'in this particular form I have illustrated it. Of course 46o Y in this case`the inductor would be composed j of sectors'of diereut polarity, equal in num-- ber to the pole-pieces. The accompanying drawings show my invention, Figure 1 being a side elevation of 65 my improved machine withl one of the bear- -ings removed; Fig. 2, an end elevation, partly in section, upon the line 2 2 of Fig. l. Fig. 3 is a diagram o f the electric circuits. Fig. 4 is a sketch illustrating the .magnetic paths of 7o the machine, and Fig. 5 is a modified form. y I

A is the base of the machine, B is the fieldmagnet frame. C C are the bearings for the armature. Pole-pieces D D in the case illustrated for a four-pole machine are lalso provided with suitable field-magnet coils D' D, surrounding the pole-pieces. The polar-'faces F F are extended circumferentially partly, around the revolving inductor.

K is the shaft of the machine, to which is 8o keyed a suitable spider carrying the induc- G G are the' projecting arms of the induct-o'', by the motion of which past the armaturecoils a ditl'erenceof magnetic condition is produced. Upon the extended pole-faces'F F the armaturefcoils la' b'c' are disposed. Inthe case illustrated' I have shown -a threephase machine, and there are six coils disposed upon eaeh polar face; y .l 9o

The circuits are best seen in Fig. 3, in which a e are the leads .from the' armature-coils, and a' b' eare the armature-coils themselves. The order ofeonnection is best secu by tracing the connection of a seriesof coilsfor in- 9 5 The coil a', -being mo'st nearly adjacent to the inductor, is connected to the coil a, which is on the under layer, while a is upon the upper layer. a."

again 'is-on the under layer, 'and so on around Ido `the armature. These connected coils give vrise'to the current of o nc phase, while the coils may be mounted, the effect ofthese prolthat each of the projections 'or 'teeth ofl the -ing armature of the toothed type.

'the total inductance of each of `the'circfuits is `Apolar face adjacent to' which it maybe. -For the inductor moves each of these different 'fluXesWould shift along fthe polar face of the .netic flux through the ditlerent coils `,.in., the order desired, The economy Ain coppe -oost next set` b 112 b5 provides the current of auf l i ing in my invention excludes the ,use of the t delta-Winding. The eld-magnets formacircuit closed tlfrough the exciter E of the usual shunt type, providedwith a regulating-resistan'ce R for determining thc output of the machine. I prefer to have the polar faces provided-With projections upon 'which 'the jections being similar to those on any revolv- By mounting the coils 'in sets upon -these polar-face projections, the .coils being alternately adjacentfto and slightly removed from the in ductor-as,`for instance, the coils d a2 a3- v substantially equalized.

In Fig. 4 I showy the mag ne'tcpaths of the machine.

In this. casejt` will .be observed inductor is of polarityop'posite to that ofthe instance, suppose four of the induetor-teeth be opposit'each ot' the poles. There would. then be four iiuXes acrossthe vair-gap and through the armature-coils, as shown. As

eld-magnetmd thus Wouldcut each of the coils in succession.

In Fig. `5"I illustratetheapplication of my invention to the bipolarconstruction, which, for small machines or high speeds, might be. conveniently done, although I prciera multipolar structure. y

All of the forms'illustratcd have the coinmon advantage of 'providing a single fieldmagnet winding which'l Will produce a num-K ber of separate magnetic fields.` For instance, suppose the machine to have sixty-fou r poles. It/ might still be made in the form illustrated in Fig. l, and sixteen coils (in a single-phase machine) would be disposedzupon eachpolarface', and an inductor havingasuitable numher of teeth being provided'to pass the mag- 1- is thus manifest, as a single ,'c'oil, necessa ily larger than any one of the ield-magnetgcoils,

butvery much smaller than the lsimiof sixy teenof such coils, would be sufficient to provide the field-excitation.

The machine is not only advantageous in regard to copper cost, but, owing to the smaller resistance of the held-magnet Windings, a less amount of current will be con-y increased. 1- u i I aim to include in the scope of the claims appended variations of form and other changes of construction not involving departure from the principles of construction herein set out.

What I claim as new, anddesire to secure by' Letters Patent of the United States, isl l. An inductor-dynamo having inwardlyprojecting pole-pieces provided With fieldmagnet' windings, armature-coils mounted upon the polar faces',and a revolving inductojr.

2. An induetor-dynamo comprisinga iieldmagnet having projecting pole-pieces,ppole faces circumferentiall-y extended, the armasumed in excitation.. and the eliiciency thus ture-coils-being mountedv 'upon the polar faces, and a revolving inductor.-

An inductor-dynamo having inwardly-` extendinggpole-pieces, polar faces provided with projections, and armature-coils mounted upon the projections of the polar faces. y

4. `An inductor-dynamo comprising inwardlyextending pole-pieces, polar faces provided with projections, and armature-coils mountedin sets upon the projections of the polar faces, alternate coils in each setbeing adjacent to andremoved from a' revolving inductor.`

y5. l Aninductor-dynamo comprising a fieldmagnet having inwardly extending polepieces of alternately-opposite polarity, arma` ture-coils mounted upon the polarfaces of the field-magnets, anda revolving inductor havingprojections v'passing througlrthef fields created bythe ,eld-magnet poles.l

' 6.,.Afeldvagnet `structure for aninductorlyneiaoiplfisinsMld-magnet cores,- polar faces having proje .tions upon which thecoils mylivelrid 'a pil-1112911 each field-1112s* '11 5. U1 seeming annif-Phe. yP110- IOO

Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US2432500 *Jul 1, 1942Dec 16, 1947Aga Baltic AbEarth inductor generator