US241242A

US241242A - Armature for dynamo-electric machines

Info

Publication number: US241242A
Authority: US
Publication date: 1881-05-10
Anticipated expiration: 1898-05-10

Description

('Nollodel.)

W. E. SAWYER 8v E. R. KNOWLES.

Armature for Dynamo Electric Machines.

No. 241,242. Patented May 10,1881.

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UNITED STATES PATENT OFFICE.

WILLIAM E. SAWYER, OF NEYV YORK, AND EDWARD R. KNOWLES, OF

BROOKLYN, N. Y., ASSIGNORS TO EASTERN ELECTRIC MANUFACTUR- ING COMPANY, OF MIDDLETOW'N, CONNECTICUT.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 241,242, dated May 10, 1881,

To all whom it may concern Be it known that we, WILLIAM E. SAWYER and EDWARD R. KNoWLEs, citizens of the United States, residing at New York and Brooklyn, in the counties of New York and Kings and State of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being bad to the accompanying drawings, and to letters or figures of reference marked thereon, which form a part of this specification.

Our invention relates to dynamo-electric machines.

The object ofour invention is to preventheating of the several parts of the generator.

The invention consists in an armature-shaft perforated at its ends to admit water into an annular space formed by an outer and inner cylinder, suitably secured to the armatureshaft, the annular space thus formed being larger than the ingress and egress openings in the armature-shaft.

It further consists in details of construction that will be hereinafter more fully set forth in the accompanying specification, and pointed out in the drawings, in which- Figure l is a vertical section of our device, and Fig. 2 is a cross-section of the same.

It is well known that when a dynamo-electric machine is driven at such a rate of speed as to generate the quantity of electricity required the parts of the machine become heated to such a degree as to greatly increase the resistance, and often burn the insulating substance surrounding the wires. Various means have been devised to prevent this electrical heating. Some of them consist in passing water directly through the shaft. Others consist in having great exposure of surface. These methods are, however, defective, and do not give good results.

(No model.)

In order to overcome these objections we construct the armature of a wrought-iron tube, D, to the ends of which are screwed brass disks C C, fixed to a shaft, A.

B is a brass cylinder, closed at both ends and secured to the shaft inside of the iron tube D. The water flows into the shaft at a and all around the annular space S, between the cylinders B and D, and flows out at b. The ad vantages are that the water entering at one end of the shaft is compelled to flow to the inner surface of the outside cylinder, D, thus keeping it cool, the wires being wound around this cylinder. Moreover, the annular space 8 being large, a large quantity of water can pass through the armature-space. This form of construction of the armature, by making it of two cylinders, reduces the weight, and hence does not require so much power to rotate it; or the cylinder B might be omitted.

Having thus described our invention, what we claim is 1. A dynamo-electric machine the armature of which consists of two cylinders suit-ably secured to the armature-shaft in such manner as to leave an annular water-space between the cylinders larger than the opening through which the water flows into and out of said wa ter-space, substantially as described, and for the purpose set forth.

2. A dynamo-electric machine the armature of which consists of an outer and inner cylin- \VM. E. SAVYER. EDWVARD R. KNOWLES.

Witnesses J OHN F. TAPSCO'lT, LEONARD SAWYER.