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Publication numberUS452420 A
Publication typeGrant
Publication dateMay 19, 1891
Publication numberUS 452420 A, US 452420A, US-A-452420, US452420 A, US452420A
InventorsFerdinand A. Wessel
Original AssigneeThe excelsior Electric Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Ferdinand a
US 452420 A
Abstract  available in
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Claims  available in
Description  (OCR text may contain errors)

(No Model.)



No. 452,420. Patented May 19 891.





SPECIFICATION forming part of Letters Patent No. 452,420, dated May 19, 1891. Application filed November 19, 1890. derial No. 371,909. (No model.)

To ctZZ whom, it may concern.-

Be it known that I, FERDINAND A. \VESSEL, a citizen of the United States, and a resident of Brooklyn, in the county of Kings and State of New York, have invented a certain newand useful Dynamo-Electric Machine and Motor, of which the following is a specification.

My'invention relates to the field-magnets of dynamo-machines, and has special reference to the arrangement'and construction of the cores of such magnets.

The object of my invention is to produce a laminated magnet-core whose laminae are simple and cheap of construction. and readily assembled and dismounted, and which at the same time is effective in operation.

It is, moreover, my obj eat to produce a magnet-core which shall obviate the generation of heat, which heretofore existed in laminated cores, and which was a source of annoyance and injury.

For this purpose my invention consists in making the laminated core of separate laminae for each pole-piece, which laminae are L- shaped and counterparts of each other, and whose transverse legs are adapted to be piled one upon the other, so as to form the yoke or keeper of the field-magnet.

My invention, moreover, consists in a fieldmagnet whose pole-pieces consist of laminae with intervening air-spaces, which permit the ready circulation of air and thus prevent heating and consequent injury to the dynamo. This feature of my invention, in the present instance, is the result of the peculiar structure of the laminae, but might be produced in a variety of other ways, as will be understood.

My invention, moreover, consists in such further features as will be pointed out below and covered in the claims.

In the drawings accompanying this specification, Figure 1 represents a vertical longitudinal section of fieldanagnet embodying my invention in its preferred form. Fig. 2 represents an end elevation of a dynamo with my laminated field-magnet in position.

In these drawings it will be observed that the field-magnetA is composed of a number of L-shaped plates or laminze B and B, whose upper ends constitute, when the laminze are .of the upright Z).

assembled, the north and south poles, respectively, of the magnet. The plates B and B are the counterparts of each other, being preferably cut or stamped outby the same die, or in anyother con venient and desirable way. They consist each of an J -sh'a'ped "angular plate having an arm or pole-piece I), having an arc-shaped concave cheek b for facing the armature O of the dynamo, and a transverse piece b at an angle, preferably a rightangle, thereto, and preferably occupying the same plane therewith. This piece I will term the yoke-piece, because when the laminae are assembled it forms the yoke or keeper of the field-magnet A. The cheek-piecesb,asshown, overhang the upright pole-pieces b, and so as to form a shoulder at b whose lower edge is preferablyat right angles with the inner edge These angular laminae are assembled to form the field-magnet by piling them upon each other, so thatthe pole-pieces, preferably of the alternate laminae or sections, will occupy the positions of the north and the south pole, and their yoke-pieces overlap each other and alternately extend in opposite directions from the pole-pieces K) through the field-magnet coil E of the machine. This will be evident from the figures of the drawings, where b designates the ends of these yokepieces. The fieldanagnet coil E, which surrounds the yoke-piece portion of the plates, is preferably first wound upon a suitable bobbin and the plates or lamina: assembledin proper relation to one another byinserting the yoke portions thereof through the coil, the yoke portions of the plates atopposite ends of the coils alternating with one another. \Vhen the laminze or sections are thus piled up or assembled, they are secured in positionby bolts D, passing through perforations near the two ends of each yoke-piece, and nuts (I, threaded onto the ends of the bolts. Of course any other means of securing the yoke pieces to-.

gether may be applied without departing from myinvention. The field-magnet so constructed is mounted in any proper frame F, for which purpose it is desirable to fasten it in said frame by means of the bolts D,whieh are passed through the laminze and are provided with nuts (Z.

As will be seen by reference to the draw- ICO ings', when the laminae are assembled the upper edges of the yokcpieces b the inner edges of the upright or pole pieces Z), and the lower edges of the shoulders I), form a rectangular 5 space, or one substantially so, within which the upper half of the magnetic coil E, which is wound around the transverse keeper or yoke formed of the yoke-pieces b is inclosed, snugly fitting therein. I am thus enabled to obtain a Very compact arrangement of the machine, which is a very desirable feature.

The laminae constructed in accordance with my invention are simple in form, and the sections for the north and the south poles, as seen,are identical in form, and are so formed that the yoke or keeper and pole-pieces are all formed by simply assembling the sections in the manner indicated. The form of these sections is, moreover, simple and may be cutout of the blank by comparatively inexpenslve dies. From this and the fact that only one form of section is to be cut out it will be seen that the cost of production is reduced to a minimum. From the manner of assembling these sections, as above described, it follows that the pole-pieces h of each pole are separated at their field portion by intervenmg air-spaces b which allow a ready circulatron of air and consequently prevent the liability existing heretofore to generate heat in this part of the magnet and the consequent damage to the machine.

I do not limit myself to the precise form of the L-shaped plates, since the same may be modified, still preserving that feature, which consists in making each of an L shape, one arm of which is long enough to form one complete section of the yoke-piece and extends entirely through the coil wound on such yoke piece.

Vhat I claim as my invent-ion is 1. In a field-magnet [or dynamos, the, a laminated magnet-core composed entirely of L-shaped lamina of the same form and dimensions applied upon each other and having their yoke pieces or extensions overlapping each other and extending in opposite directions entirely through the field-magnet coils wound upon them, in combination with fastening-bolts passing through said L-shaped pieces at the angle of the pieces whose pole portions are at one end of the coil and through the ends of the L-shaped pieces whose pole portions are at the opposite end of the coil, as and for the purpose described.

2. The combination,in an electricmotor or dynamo, of a field-magnet consisting of identically-formed L-shaped plates B 13, having yoke portions or extensions b overlapping one another and all of sufficient length to extend entirely through the magnetizing-coil, a magnetizingcoil E, wound over the yoke portions, and bolts I), passing through the ends of the yoke portions or extensions of the plates at the opposite side of the coil from the end carrying the pole portions.

Signed at New York, in the county of New York'and State of New York, this 1st day of November, A. D. 1890.



WM. H. CAPEL, TI-ros. F. Counnv.

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Cooperative ClassificationH02K1/02