US394978A - Core for the armatures of dynamos - Google Patents

Description

(No Model.)

D. J. HAUSS. 00112 FOR THE ARMATURES OFIDYNAMOS. N0. 894,978. Patented Dec. 25, 1888.

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UNITED STATES PATENT OEEIcE.

DAVID J. IIAIISS, OF (IXCINNATL (lllIO.

CORE FOR THE ARMATURES OF DYNAMOS.

SPECIFICATION forming part of Letters Patent No. 394,978, dated December 25, 1888. Application filed December 31, 1887. Serial No. 259,526. (No model.)

To aZZ whom it may concern:

Be it known that I, DAVID .I. HAUSS, of

Cincinnati, in the county of Hamilton and 1 State of Ohio, have invented a new and useful Improvement in Armature-Cores, (Case A,) l

which improvement is fully set forth in the following specification and accompanying drawings, in which Figure I is a side elevation, partly in sec- 1 tion, of my improved armature-core. Fig. II is a side view, partly in section, of one end of an armature, showing a modified form of the core; Fig. III, enlarged perspective view of one end of core; Fig. IV, perspective view of the commutator bars or plates; Fig. V, perspective views of the disks employed in the construction of the core, and Fig. VI a partial central sectional view of the core.

This invention relates to armaturecores for electric dynamos or motors. In order to attain a maximum efficiency it is necessary to have the lowest internal resistance to rotate the wire of the armature as close to the polepieces as possible, to have the magnetic field intense, and the armature light. As solid iron cores produce eddy-currents, I have especially provided against this by my special form of construction, and as great difficulty is experienced in winding armatures, by the breaking of the insulation of the wires at the corners or ends of the core, I have so constructed the core that no danger from this source can occur. To attain these ends I build up the core of disks of thin metal and paper, which are placed on the mandrel alternately, so as to form a core of sutficient length; and these disks are compressed on the shaft by means of washers at each end and nuts on the mandrel or shaft. The core thus formed is turned down true, and at each end a square annular gain is turned in, and the corners of the gain are clothed with flexible or elastic insulating material to receive the wires which are wrapped across the core from end to end, all of which will now be set forth in detail.

I would observe that as the core may be wound in a variety of ways, I have confined my present invention to the construction of the core and to the method employed to construct it preparatory to equipping it with wires.

In the drawings, A rtprcscnts the mandrel, having reduced ends l; I partially threaded at U and provided with nuts I).

E E represent iron disks and F paper disks, or composed of some other insulated material. These iron and paper disks are placed on the mandrel alternately, so as to form a core of the proper length. The disk at each end is composed of a thick disk, G, of insulating material, and next to the disk G is a similar thickened disk, II, of insulating material. These disks are preferably composed of some flexible or elastic material, so as to form a cushion for the corners. Instead of having the inner flexible or thickened disk, II, a band, I, of some elastic insulating material may be employed, as shown in Fig. II, to form a corner. It is essential that the insulating material used at the corners should be pliable or yielding, such as soft rubber or other pliable or flexible material. When the core has been formed by means of the disks E F G II, and the whole properly compressed into a solid body by means of the n uts D and the washers .I behind the n uts, the mani'lrcl is put in a lathe and the disks turned up true, and an annular gain, K, is turned into each end. 'lhese gains terminate at the thick disks ll.

7 In winding the core the wires are bent down over the corners, and as the corners are protectcd by the thick elastic insulated disks no leakage would result should the insulated wrapping ot the wires be lrm-tured or broken.

III I i III, I show the mandrel equipped with comnnitator-plates l These plates are shown in perspective in Fig. IV, in which their-inner ends are bifurcated to receive the ends of the wires which are wrapped on the core. Before these plates are attached to the mandrel the latter is covered with an insulating-sheet, M. This sheet M also extends beneath the disks E F H II. The surface of the disks is also coated with insulated material N lad'ore the wire is wrapped thereon.

I have not shown any particular method of securing-the commutator-plates'L to the shaft; but this is not a material part of the present invention, and it is obvious that any suitable mechanical means may be employed for this purpose. I have merely shown them in this case to illustrate the manner in which the,

forth.

3. A core for armatures, mounted on a shaft, having at each end an annular gain or recess lower than the surface of the core, both of the corners forming the gain having flexible insulating material thereon, substantially as herein set forth.

4. A core for armatures, having at each end a diametrically-reduced disk of thick flexible insulating material, and next to the reduced disk a thick disk of the same diameter as the core, composed of soft flexible insulating material, substantially as herein set forth.

5. The combination of amandrel and the laminated core secured together by Washers and nuts, and the end disks of soft flexible material forming insulated corners, substantially as herein set forth.

6. A core composed of alternate iron and paper disks mounted on a mandrel and coated exteriorly with a sheet of insulating material, in combination with flexible ends and corners of insulating material, substantially as herein set forth.

In testimony that I claim the foregoing I have hereunto set my hand, this 30th day of November, 1887, in the presence of Witnesses.

DAVID J. HAUSS.

\Vitnesses:

F. M. DILLIE, J. S. ZERBE.

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