US1255486A - Dynamo-electric machine. - Google Patents

Description

N. W. STORER.

DYNAMO ELECTRIC MACHINE.

APPLICATION FILED MAY 22, I9l3.

.iat-onted Feb. 5, I918.

2 SHEETS-SHEET I.

WITNESSES:

N. W. STORER.

DYNAMD ELECTRIC MACHINE. APPLICATION FILED MAY 2'2.-19|3 ATTORNEY 00 l W 5% b i FT H IQH m n2 0 m v UNITED srirrns PATENT OFFICE.

FGBMAN W. STOBER, F PITTSBURGH, PENITQYLVANIA, ASSIGNOR TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

DYHAMO-ELEGTZELIC MACHINE.

Application flied May 22,

' ijf' 'one'ob'jectofmy invention is to provide I a machine of'the above-indicated character which shall be light in weight, compact and durable in construction, and, by reason of the peculiarerrangement of its component 2!} parts, shall be of relatively high eliiciency.

" f 1 Another obect of my invention is to pro 5 vide'f an inclosed, self-contained units!" -'--structure of the bi-polar type which shal "*comprise twin armatures and a single magi fi'fnetic circuit to serve for both armatures in Scom'mbny thearmatures being connected in series-circuit relation with each other and 'i-with the severalfield coil windings, and -ed'a'pted tobe controlled as a single driving "so 'unittqdeliver energy in common to a single driving ax1e.- 4

"j-aAIlOthl object of my invention is to pro- Wfidea'twinmotor structure having its armaf"tures"di'spos ed.c lose together in side-by-side relation and-spaced apart only by a slight air gep', whereby the longitudinal dimension and the "length of the magnetic circuit are reducestojwrninimum and the weight and ""gire reduced accordingly.

' fstill further object of my invention is i 'toenibody, in such a structure, a. single commutatingpo'lefor each armature, which poles n LJrinssociated with the respective end por- -"-ions-o the inclosing frame.

k sti]1- further ob ect is toprovide astrucv re ;o f this general. type having relatively few partswliich may be readily and cheaply ace and finished with little machine work 'iiiid labor and-which may be assembled and GOi'take'n apart with facility. Another object of .m'y" invention is to adapt-the structure for commercialmanufacture upon a large scale and to em'ploy parts of standard form which ---;mylie-curried in stock for. use when do Specification of Letter: Patent.

Patented" Feb. 5, 1918.

191a. 5crlalNo.769,204.

In the prior art, it has been suggested to employ motors of the twin bi-polar type for railway work but they have never proved satisfactory from an operating and commercial point of view because'all of such new chines have been unduly large and of excessiveweight. Moreoverythe design thereof has been inferior, as regards mechanical structure and electrical characteristics, by reason of the arrangement of parts which permitted large magnetic losses by reason of leakage and excessive length of the magnetic circuit. The operation of the structures heretofore employed has been unsatisfactory because they were not, and could not, be provided with efiective commutating poles. Fur-- thermore, in the past,-'the-armatures have been operated independently}whereas I propose to combine'the' twin armatures both electrically and mechanically and" to control them as a single unit, in combination with other similar units, whereby. direct. current energy in the neighborhood of 3600 or 4800 volts may be utilized .for electric railway service.

My invention willtherefore-obviate the diliicnlties heretoztore encountered and will provide a motor structure which may be manufactured a-nd'will'operate to advantage and will therefore open up the field of high: voltage direct current railway service.

In the accompanying 'drawing,*-Figure 1 is a view, partially in; section anili'partially in end elevatiomofa portion hf a; dynamo electric machine constructed in accordance with my invention, and Fig. '2 is a View, partially in section and partially'in side elevation, of the unitary' driving structure shown in Fig.1. I

Referring to.the drawings; the structure shown comprises essentiallya pair of armstures 1 and 2 thatuare di'sposed one above the other in parallel relationship aiid are rotatably supported bya, locality of bearing housings 3, l, 5 and 6 "aving' their seats in openings iri'end portions falid 8 of a hollow substantially rectahgularjinclosing. frame or casing 9 which surroi nds the armatures 1 and-2, The frame!) is pl iovided with detachable main polar projections 10, 11, 12 and 1.05 13 having fieldcoil windin'gs'll, 15, 16 and 17, and with 'commutating polar. projections 18 and lilthat are respectively provided with oopmutating field coil windmgs'fifi and 21-. The armatures Land 2 areof like construction and may embody any suitable structural details that are commonly .used in the art. The armatures are disposed close together, being separated only by a comparatively small air gap 22, and are severally provided n l ' h pinions 23 and 24 in the usual manner, to cotiperate with a suitable gear 'port ,caps' 27 which form parts of the frame 9.

wheel 25 which is fixed to a driving axle 26. The axle'26 is provided with driving yvheels (not shown) andis adapted to partially supthe entire structure by means of axle Obviously, the total energy is transmitted to the driving wheels through ,the pair-of pinions 23 and 24 which may be of relatively short length, thereby permitting driving units. oi large, capacity by reason of the increased amount oftransversespace that may be-utilized-ior them.

I The frame 9 is provided with side portionsBO andh31 which are relatively large in cross sectional area in comparison with the end portions 32 and 33 for a reason to be hereinafter ointed out. The several main polar promotions 10 to 13, inclusive, are disposed in pairs on the opposite sides V of eachof the armatures 1 and 2 and are re- Suitable bolts 38 maybe em .purpose or any other meansing the sameflresult.

- .The polar projections *spectively' secured to inwardly projecting 7 armatures and are respectively detachahly constitute m ly,

-readily ma .pense; 1. 7,, I, The several bolt holeslmay; also-be drilled ,-'-1 inia single operation, 'by a"mult is indle,

secured to the base portions or seats 39and 40 of the end portions 32 and33 of the frame 9 in a suitable manner.

- By reason of the arrangement and location of'parts, the seats-3&, 35'and 39 may be fin-V ishedby a single.boring'operation as theyeleinents of assinglecylinder.

the seats 36,- 37. and 40 may be de l'atj comparatively small 7 .e

drill, so'thatthe expense and labor-of nish-j ing theseveralp'arts'is 'reducedto a minimziringf'which particularly adapts the struc-';

' or. 'commercialmanufacture uponfa invention-"and riodetailed; description thereof is deemed necessary, asv any suitable type of construction may be employed.

Thearmatures 1 and 2,- as 'vvell as the mam field coils 14; 15, 16 and 17 and the commutating jfield coiis2l3'and 2i areconnected in series-circuit relation and are operated and controlled as a single unit, it'being understood that, with this arrangement of circuit connections, each 'of the armatures has ims pressed upon it substantially half of the total motor voltage. i

The cross sectional area of the side portions 30 and 31 of the frame 9 is chosen to give the desired flux density in the magnetic circuit which comprises the armatures l and 2, main polar projections 10, 11, 12, and 13 and the side portions 30 and 31 The magnetic circuit, just referred to, serves incommon for both of the armatures l and 2, and is magnetized in accordance with Wellknown principles by the main field coils 14: to 17, inclusive. Inasmuch as the armatures 1' and 2 are spaced so closely'togetheg-the I total length of the magnetic circuitis re-' v '85 Under certain conditions, it may be found duced to a minimum.

desirable to efiect even 'great'erfeconomyi'm weight and space than is'possiblevviththe l particular structure illustrated, -in= which case, the armatures may helocated extremely close together with only sufiicient-clearance for safety. Obviously, the adj'acentsides of I the armatures are'of thesame-polarityand 1; would exert a neutralizingactionsupon ea h- :1 other, thus preventing any .iir'oss magnetizagtlOIl.

tions 32 and 33 may he-chosen toiaccommo date any desired main poles, although it is only necessary to make them of so cient thickne'ss,.-to carry the'flux; that 'is to ,he passedthrough the cominutating polar projections 18- and 119 which-passes through'thearmatures 1 and 2 at i The relative Q proportiori s of amount of flux fronithe" A and consistent with mechanical, strength. .It "is obvious that a certain amount of flux is forced through the endpo'rtions' 32 and 33' of the frame in shunt theretop according to the amount of current. traversing the armat'ures and fieldcircuits andijthe degree of saturation in the several-parts."

- The armatures 'are respectively provided with'a plurality; of-jdiametrically disposed brushes 41,,eachtofwhich is carried in an arm or supporting bracket 42, the latter being clamp ed'or"otherwise suitably secured to a plurality of insulated rods 43 which pro- .je'ct vertically within the frame '9, and are t. a fastenedthereto' several field coils 14 tol'lfinclusive and, 21 are rectangular andstand'ar i i, remand may be economically vvcund'in large quantities The specific; structure of u the field: coilspert'ains only indirectly to my Wh i1e I have illustratedsh ll described a preferred embodiment of'my invention, it

flmanifestlthat many other devices of a sinular type which difier to a greater or less ex-- tentin s'pecificl structural features, may be made vjvith' utvd e'parting from the spirit and vention', and allsuch modintended to covered in the chine, the combination with a pair of armatures having their axes in different parallel 1 pair of polar members for each armature and a rectangular magnetizable frame asso? ciated with said polar members and inclosing-saidarmatures and polar members, of

. magnetizin coils disposed upon said polar members a jacent to the respectivearma- 'ture's and'adapted to force the main body of flux through a single magnetic circuit includin and side ortions of said frame and the remaining in multiple magnetic circuits including the respectlve armatures, their associated polar members and the end portions of said frame.

2. In a twin bi-polar dynamo-electric ma chine, the combination with a air of armatures having their axes in di erent parallel lines and separated only by an air gap, a

unitary rectangular magnetizable frame 1nclosing'saidarmatures and having end portions of small sectional area and side portions of relatively large sectional area, and

' a pair of main polar projections for each armature associated with the side portions,

' of magnetizing coils dispox edTupon the respective polar prpjections ,zi djacent to the armatures, auxiliary 'commutating polar pro ections associated with the end portions, and magnetizin coils therefor -1 3 A uple x i-polar dynamo olectric ma chin e comprising an ob ng' substantially rectangular field'magnet frame'havingtwo both armatures, the polar members.

; side-b -side pairs of main polar projections exten ing inwardly from the ion er sides of lines and separated only by an air gap, a

ing polar projections.

4. In a twin bi-polar dynaano-electric machine, the combination Wltll a pair of armatures having their axes in diflerent parallel lines and separated only by an air gap, as pairof polar members for each armature, and a rectangular magnetizable frame associated with said polar members and hidesing said armatures and polar members, of magnetizin coils disposed upon said polar members a jacent to the respective arma tures and adapted to force the main body of flux through a single magnetic, circuit includin both armatures, the polar members, and si e ortions of said 'fr'anie.

In testimony whereof, l-have hereunto subscribed my name this 15th day of May,

1913. NORMAN W. STORER.

Witnjesseszs J ACOB' 'r r.

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