US380620A - Dynamo-electric machine - Google Patents

Description

(No Model.)

. W. A. OROWDUS 81; H. M. SUTTON.

DYNAMO ELEGTRIO MACHINE.

Patented Apr. 8, 1888.

s. Pinata-Lithographer. Walhinflon, v.0.

:To all whom 1115 Hwy concern.-

Be it known that we, WALTER A. CRowDUs- UNITED STATES PATENT OFFICE.

WALTER A. OROWDUS AND HENRY M. SUTTON, OF DALLAS, TEXAS.

DYNAMO-ELECTRIC MACHINE.

$PBCIPICATION forming part of Letters Patent No. 380,620, dated April 3, 1888.

Application filed Di cember 14, 1886. Serial No. 221,508. (No model.)

and HENRY M. SUTTON, both citizens of the United States, and residents of Dallas, county of Dallas, State of Texas, have invented certain new and useful Improvements in Dynamo- Electric Machines, of which the following is a specification.

In the construction of dynamo electric machines various attempts have been made to eliminate the Foucault currents generated in the armature by substituting for the original solid iron cores of the armatures, both of the (jramm e and Siemens types, soft-iron wire i 5 wound into the desired form, or disks of iron combined in various ways, to form the cores upon which the armature-wire is wound.

Now in our improved dynamo-electric machine we combine in the armature the advantages due to iron wire and to separated disks by first winding iron wire into the form of disks or fiat rings, and then binding them together at equal intervals by forming around them series of pole-pieces of-iron wire wound thereon at right angles to the first winding, and

soldering or otherwise holding the whole together when finished. As many of these iron disks as are necessary to form the iron core of an armature are placed side by side with their wire pole-pieces in contact, and secured to the shaft in any suitable manner. When applied to a Siemens armature, the inner parts of the wire pole-pieces rest upon the shaft, and end nuts are used to clamp the wire disks firmly together on the shaft. The armature-wire is wound around the core thus formed parallel to the shaft in the spaces between the wire pole pieces. Armature-cores constructed on this principle admit of free circulation of air through the spaces between the inner parts of the wire pole-pieces and the side spaces of the adjacent wire disks, thus providing for a perfect ventilation of the armature.

It is thought preferable to use galvanized iron wirein the construction of our armaturecore, thus destroying the magnetic contact between the adjacent layers and coils.

The improvements in the field-magnet'systcm in combination with which we use our improved armature consist in providing each pieces joined to the end-connecting pieces of the magnetic circuit. These side pieces are curved outwardly at their parts opposite the pole-pieces, so that they will not interfere with the action of the magnetic field on the armature. This form of field-magnet is compact and rigid, and the magnetism is concentrated on the armature, which is fitted in suitable bearings to rotate between the poles.

By the following description, in which the accompanying drawings are referred to, a full understanding of our invention will be had.

Figure 1 is a vertical transverse section of our improvements in dynamoelectric ma chines. tral section of the same. Fig. 3 is a sectional view of one of the wire armature-disks in perspective, and Fig. 4 represents a number of these disks placed together in the posit-ions they would occupy in the machine.

The disks or rings a a of the armature are composed of iron wire, preferably galvanized or otherwise provided with a coating of nonmagnetic material wound in a suitable mold or former, and on these wire-rings are placed .at regular intervals windings of iron wire,

also magnetically protected, which constitute the pole-pieces b b of the armature, the whole, when thus prepared, being secured together by solder or other suitable means.

The requisite number of the completed disks or rings a b to form the core of an armatureas, for instance, a Siemens armature, such as shown in the drawings are then placed on the armature-shaft c, with their corresponding pole-pieces b b in line, thus leaving longitudinal grooves in the periphery of the armature between the pole-pieces, in which grooves the armature-wire d is subsequently wound. The inner sides of the wire pole-pieces b b rest on the shaft 0, thus holding the disks concentric with the shaft. To hold the whole together,

washers are set over the shaft, bearing against the sidesof the polepieces b b of the outside wire disks, and nuts 0 e screw on the shaft the two pairs of branches, so as to complete Fig. 2 is a vertical longitudinal cen- 7o against the washers. These washers, to provide more fully for the circulation of air through the armature, may be made with separated arms, to bear against the sides of the pole-pieces b b.

It is unnecessary here to enter into the manner in which the armature-wire coils f are placed on the armature-core and the connections of the same made with the commutator such being well understood.

The field-magnet system m, in combination with which our improved armature is used, consists of upper and lower poles, h h, from each of which extend divergently two branches, 2' t" and i" 2', respectively, a top plate, j, joining the branches it together, a bottom plate, j, which constitutes the base of the machine, joining the branches ivl' together, and the side pieces, 7e70, secured to the top and bottom plates, j j. These side pieces are curved at their parts la la, which are the neutral points of the magnets, opposite the poles h and h, so as to remove them as much as possible out of the influence of the magnetic field between the poles, by means of the boltsZ Z, of brass or other nonmagnetic material. By this construction the iron-work of the field-magnet system is made very rigid and strong, without using undue weight of metal therein.

Each of the poles h and h, with its branches it and i i and eonnecting-piecesj and j, re spectively, is represented as integral in the drawings, but may be built up of separate pieces in any manner well known to constructors of dynamo-machines. The field-magnet wires m m are placed on the branches 1' i and i i. The armature is held concentrically between the poles h h by its shaft a, rotating in bearings an, secured to the sides of the poles h h, it being of course understood that such bearing-pieces are made of a non-magnetic metal.

A current-regulating device is shown in Fig. 2 connected to the commutator-brush carriers, consisting ofan iron rod, 0, fitted to slide in a hole formed in one of the poles, and provided with a rack on its outer end meshing into the pinion p, on the shaft of which is secured the bevel-pinion g, which meshes into bevel-teeth formed on the brush-carrier r. A spring is placed in the drum 5 on the shaft of the pinion 1), to act against the magnetic pull on the rod 0, which is caused to change its position, and consequently shift the brushes of the commutator as the strength of the field varies. This device forms the subject of another application for Letters Patent filed simultaneously herewith under Serial No. 221,510.

Having now described our invention, what we claim, and desire to secure by Letters Patent. is

1. A disk or flat ring adapted to be usedin the construction of armature-cores, consisting wholly of iron wire, galvanized or otherwise magnetically insulated, wound into the form of a disk or ring, having projections or polepieces formed of iron wire wound thereon, the whole being secured together by solder or other suitable means.

2. An armature for dynamo-electric machines, consisting of disks or flat rings made of iron wire having pole pieces of iron wire wound thereon at regular intervals, placed and held on the armatureshaft with the ironwire pole-pieces of the adjacent disks or rings in contact and in line, the spaces between the pole-pieces of the several disks or rings thus forming longitudinal grooves in the periphery of the armature for the reception of the armatare-wire.

3. In a field-magnet for dynamo-electric machines, in combination, two pole-pieces, top and bottom plates joined to the polepieces by branches upon which the insulated wire is wound, and side pieces connected to the top and bottom plates and having outward curves at their central parts opposite the pole-pieces.

4. In combination,thepoles h h, the branches or arms it and i t,connected, respectively, to and extending divergently from the poles h h, the top and bottom plates, j and j, connected to the branches it and t" *5, respectively, the side pieces, 76 it, having their central parts, k In, curved outwardly,and the bracing-bolts Z l, substantially as and for the purpose set forth.

5. In combination, the disks a, composed of iron wire having the polcpieces b, also composed of iron wire, the shaft 0, the insulated wire d,wound in the spaces between the poles bo'f'the disks, and the end clamping-nuts, e e,

substantially as and for the purpose set forth.

6. In a dynamoelectric machine, in combination, the poles h h, the branches or arms '6 i and i i,connected,respectively, to and extending divergcntly from the poles h h, the top and bottom plates, 9' and j, connected to the branches 1' t and i i, respectively, the side pieces, k 7., having their central parts, k k, curved outwardly and connected to the top and bottom plates,j andj,the bracing-bolts Z Z, and the armature composed of the disks 0, of iron wire, having pole-pieces I), also of iron wire, the shaft 0, the insulated wire (I, Wound in the spaces between the poles b ofthe disks, and the end clamping-nuts, e e,substantially as and for the purpose set forth.

In testimony whereof we have hereunto set our hands,at Dallas, county of Dallas, State of Texas, this 7th day of December, 1886.

WALTER A. OROWDUS. HENRY M. SUTTON.

\Vitnesses:

S. S. MAYO, C. F. ORUTOHER.

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