US286241A

US286241A - van choate

Info

Publication number: US286241A
Authority: US
Publication date: 1883-10-09
Anticipated expiration: 1900-10-09

Description

(No Model.) 2 Sheets-Sheet 1.

s. F. VAN OHOATE.

DYNAMO ELECTRIC MACHINE.

No. 286,241. Patented Oct. 9, 1883.

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(No Model.)

s. P. VAN GHOATE.

DYNAMO ELECTRIC MACHINE.

Patented Oct. 9, 1883.

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UNITED STATES PATENT OFFICE.

SlLVAXUS F. VAX CHOATE, OF NFHV YORK, N. Y.

'DYNAMO-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 286,2t1, dated October 9, 1383. Application filed January 27, 1883. (No model.)

To all whom, it may concern Be it known that I, Sl'lNAXUS F. VAN CHOATE, a citizen of the United States, and aresident of New York, in the county of New York and State of New York, havcinvented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

My invention consists in improvements in the construction of electrical machines, either for generating electricity or in those operated by the aid of electricity; and the nature and objects of the same may be known by the following description, with the aid of the accompanying drawings, forming a part of this specification.

Figure 1 is a side elevation of the frame or skeleton of a machine constructed in accordance with my invention. Fig. 2 is a plan, partly in section, of the same, taken on line A A of Fig. 1, looking downward. Fig. 5 is a sectional view taken on line B 3, Fig. 2. Fig. 1- is anend elevation of Fig. 1. Fig. 5 isa view, partly in plan or elevation and partly in section, of the armature of my machine. Fig. 6 is a plan of said armature, looking down upon the top of the same. Fig. 7 is a sectional view taken on line C O of Fig. 5; while Figs. 8 and 9 are views of the hub of my machine, the former figure being a side view, and the latter a top view, of the same.

The first four figures in the drawings illustrate the frame or skeleton of the machine, wherein the letters A indicate the iron spool, upon which, and in the open spaces marked by the letters B, is wound the wire constituting the helices of the so-called field-magnets. The spools A are of solid iron, with flanges a of separate pieces; or they may be integral. I prefer the latter.

In Figs. 1, 2, 3, and at, the letters D represent the pole-pieces, or what I call the jaws, of my machine. There are two pole-pieces or jawstop and bottom. They are preferably made each of one solid piece of iron, or other metal which can be made magnetic, and are each exactly (or nearly so) the same shape and size, having lateral arms or extensions on either side, (marked 6,) which extend over 9 and embrace the tops of the spool A, to which they are firmly held by thebolts marked 0.

It will be seen in Figs. land 8 that the pole-pieces or jaws have a portion or body extending downward and upward toward the horizontal center, or open space in the middle, and that the sides of these extensions or bed ies, as shown by the letters (1 in. Figs. 2 and 3, extend partly around and downward and upward along the sides of the spools A, and exactly parallel with said spools, and at right angles to the top and bottom of said pole-pieces or jaws, and that these extensions are curved exactly to fit the shape or contour and abut against and partly surround the outside surface of the helices of the spools A, as shown also by the letters (6 in Figs. 1 and 2. This feature of my invention is important, as it not only allows the magnetism induced in the solid core of the spools A to pass into and charge the pole-pieces orjaws, but the coils of the helices also act directly to charge the approximate or abutting parallel sides of the pole-pieces or jaws, whereby a greater mag netic force and a greater economy are obtained than if the said pole-pieces or jaws were separated, or farther away from the helices.

The armature of my machine revolves in the SOlIllClJTC/Hldl hollow groove marked by the letters E in Figs. 2 and 3; and it will be seen that the helices of the armature passthepoints or sides of the pole-pieces or jaws markedby the letters 0 in Figs. 2 and 3 on either side, very near the sides of the helices of the spools A, and that the lines of the wire on the ad jacent sides of both the armature and those of the fieldanagnets are parallel to each other, and that thelines of magnetic force are cut at right angles by the said lines of wire upon the armature, whereby the proper conditions for obtaining increased magnetic effects are ob tained.

In connection with the above, it must be taken into account, also, that in my invention the armature in my machine revolves lengthwise in the direction from one field-magnet to the other, and exactly between them and perpendicular to them or with them, there being only two single straight upright fieldmagnets-one on either side-and that so far as the sides or projections of the pole-pieces or jaws at the letters 0, Fig. 3, fit the contour of the helices of the iield-magncts, they are equivalcnt to another core of the helices of the said fieldanagnets at these points, and consequentl y receive a sub-charge by induction from the said helices. The strands of wire on the revol ving helices of the armature, when at these points, receive an induced charge, as if they were moving immediately against (or nearly so) the cores of the field-magnets, without the separation of the spaces occupied by the wire on the spools of the magnets A. The advantage and simplicity of this part of my invention are obvious to any one conversant with electrical science without further detail of de scription.

In Figs. 5, 6, 7 8, and 9 the mechanical construction of the armature of my machine is shown, and relates exclusively to the manner of binding the magnets together and securing them to the hub of the machine.

The armature in my machine is of that type commonly known as a Pacinotti ring; but instead of being a solid ring, it is built up of as many wedge-shaped magnets or segments as there are coils or helices, in a manner similar to that described and set forth in a prior application filed by me June 12, 1882, except that the manner of binding together and securing the magnets to the hub of the machine is in the present case entirely different from my said prior application. In this case the hub of the machine is marked by the letters F, and shown in Figs. 5, 6, 7, 8, and 9. It is made of some non-magnetic material, preferably of brass composition, and in the shape shown in the said figures.

111 Figs. 8 and 9 it will be seen the hub is formed octagonal to hold eight magnets. It has eight flat faces marked 9, to fit the surface of the wire 011 the helices, and eight transverse grooves marked j, and formed around its periphery. These grooves receive and hold corresponding projections or elongations of the spool-heads or flanges of the coils,which project inwardly toward the axis of the ring in the manner shown in Fig. 5 by the letters l1. This arrangement is something like the cogs and teeth in the gearing of an epicycloid, or sun-and-planet wheel, the projections of the magnets answering for the teeth of the gear and matching in the grooves in the hub, the difference being that the projections of the magnets extend entirely around the circumference of the hub. It will-be noticed that the end projections of two magnets abut together to form one cog or tooth, or that a part of the projection of one magnet sets in the notch or groove with a mate or similar projection of another magnet, and so on all aroundthe hub,

- and, being slightly wedge-shaped, when keyed or pressed up from the outside, fit tightly in the grooves and bring the two abutting surfaces of the magnets firmly together. In this position it will be seen that the hub, on turning, would carry the magnets around with it, providedthey did not fly off by centrifugal force, which is prevented by the tying-bars marked by the letters 17, and the screw-bolts k.

The bars iare countersunk, so as to be flush with the outer surface of the periphery of the magnet; or they may lie on top of such surface. I prefer the former construction. They extend from one magnet to the other, as shown in Figs. 5 and 6, and are securely fastened by the bolts kone in either magnet-in the manner clearly shown in the drawings. I The slots or grooves j in the hub, Figs. 8 and 9, are cut or formed entirely across its periphery, so that the magnets singly or collectively can be slid in and out of the grooves sidewise in either direction, and any one magnet can be disconnected and taken away from the hub or from the ring by disconnecting the bolts a I and k and bars a by sliding it out at the side or by lifting it upward or outward. The magnets are held to the hub, and prevented from lateral movement by the side plates shown in Figs. 5, 6, and 7, and marked bythe letters Z. These plates are thin flat circular hollow disks or rings of metal fitting over the ends or projections of the hubone on each sideand'secured to the sides of the hub by the screw-bolts m, and to the projections of the magnets by the smaller bolts n. and bolts also serve to hold the magnets down to the hub and overcome the centrifugal force. They alsoprevent the ring from falling asunder or away from the hub when one or more magnets are removed. When the plates Z are bolted on, a single magnet, or any number of them, can be removed from the series by removing the bolts and bars, as above stated, by liftingthe magnets upward or outward from the axis of the ring, and, vice versa, returned and secured without in the least disturbing any other -magnet remaining 011 the hub. The wire is wound in the grooves 1). (Shown in the magnets in Fig. 5.) The axle or shaft of the machine fits in the opening formed in the center of the hub, and is supported by suitable journals and bearings in the ordinary manner, which it is not thought necessary to further describe. The heads of the bolts m and n are at each side in Figs. (land 7. The cores of Figs. 5, G, and 7, the former being in elevation and the latter in section. The hub is also shown in section in Fig. 7. 4

The dotted lines 1' indicate the centers of the magnets, whereby they may be pivoted in a lathe for winding the helices.

The magnets are indicated by the letters 8 in Fig. 5.

\Vhat I claim as my invention is- 1, The combination, with the magnets or spools A, of the jaws or pole-pieces D, the sides of which, at d, extend along the sides of the spools A, and are curved so as to fit the shape or contour of the helices on the spools, substantially as and for the purpose set forth.

2. The combination, with the two magnetspools A, of the intermediate pole-pieces or.

being grooved in a plane coinciding with the shown in side elevation in Fig. 5, and in plan,

the magnets are indicated by the letters f in jaws, D, in line with spools A, said pole-pieces These plates vertical plane in which the spools A lie, and having their outside vertical edges in close proximity to said spools, all as set forth, so that the armature and the spools of wirethereon may be subjected to the inductive action of the spools and the wire on said spools, as well as to the action of the pole-pieces.

3. The combination, with the hub F, having transverse grooves, as described, of the magnets having spool-heads or flanges resting in said grooves.

4. The combination, with thehub F, having transverse grooves, as described, of the magnets having abutting heads or flanges, each pair of said abutting flanges resting in the same transverse groove.

SILYANUS F. VAN (HOATIL \Vitnesses:

Ti-ios. Tommy, Lino. (J. Comm.