US406777A

US406777A - Albert schmid

Info

Publication number: US406777A
Authority: US
Publication date: 1889-07-09
Anticipated expiration: 1906-07-09

Description

(No Model.)

A. SCHMID. ARMATURE FOR ELECTRIC MACHINES.

No. 406,777. Patented July 9, 1889.

WITNESSES: INVENTOR,

finm/n ALBEHT-EBHMID. I

' .i ralguwvwb +1 UNITED STATES PATENT OFFICE.

ALBERT SCHMID, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TO THE \VEST- INGHOUSE ELECTRIC COMPANY, OF SAME PLACE.

ARMATURE FOR ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 406,777, dated July 9, 1889.

(No model.)

To all whom it may concern.-

Be it known that I, ALBERT SGHMID, a citizen of the Republic of Switzerland, residing in the city of Pittsburg, in the county of Allegheny and State of Pennsylvania, have invented certain new and useful Improvements in Armatures for Electric Machines, (Case No. 274,) of which the following is a specification.

My invention relates to the construction of IO armatures of electric generators and motors.

The special object of the invention is to provide means for preventing the armature from unduly heating, causing it to remain at a comparatively low temperature.

[ 5 The invention consists in building up the core of plates through which holes or open ings are formed for allowing the circulation of air through the interior of the armature, certain of the plat-es having openings of different diameter, size, or shape from those of the other laminae. The plates'having different sizes may either alternate with each other in position, or groups of one pattern may alternate with groups of another pattern, so that the radiating-surface within the armature is greatly increased.

In the accompanying drawings, Figure l is a transverse section of an armature-core embodying the features of the invention, and Figs. 2 and 3 show two different patterns of the armature-plates. Fig. at shows the two plates placed against each other.

Referring to the figures, A represents an armature-shaft, and B 13 end plates for the armature core. Between these two plates laminze of magnetizable materialsuch, for instance, as soft iron 0 c are firmly bound together to form the armature-core. These plates may be separated from each other by insulating material. The plates are formed with openings which are placed opposite each other, so that resultant holes will extend throughout the length of the armature. For the purpose of increasing the radiating-surface formed within such openings, certain plates are made to project a greater distance into the openings than others. To accomplish this, certain of the plates are formed with larger openings or openings of different shapes from the others. Thus in Fig. 2 there is shown a plate having eight radial openings c, of a certain size and shape, and in Fig. 3 another plate is shown, which is to be used in the same armature, having in this instance the same number of openings, but larger. These plates may be placed alternately, or a group of any required number of one pattern maybe placed together, and then a group of the other pattern. This latter arrangement is usually preferred for the reason that it allows a wider space to intervene between the surfaces which project within the longitudinal openings of the armature. These surfaces together afford a large radiating-surface, with which the air which circulates through the armature when it is revolving is allowed to come in contact, thus causing the armature to remain much cooler than would otherwise be the case.

In Fig. two plates are shown as placed against each other, and it will be noticed that the inner ends of the radial openings correspond approximately in size and shape, while the greatest difference of size and shape is obtained at the outer edges of the openingsthat is to say, the portions which move at the greatest rapidity when the armature is revolving. It is evident that other patterns of openings than those herein shown may be employed, if desired; but those here described will be sufficient to disclose my invention.

I claim as my invention- 1. An armature for electric machines, composed of laminae of magnetizable material having openings, the openings through certain of said laminae being of different shape from those of other of the laminae.

2. An armature for electric machines, consisting of plates or laminze of magnetizable material laid with their faces adjacent to each other, said laminze having openings, the openings of certain of the plates corresponding with each other in size and position,while the metal of the other plates projects a greater or less distance into the longitudinal openings left by the first-named laminae.

3. An armature for electric machines, composed of laminae of magnetizable material, having longitudinal openings extending from i ll end to end, certain of the laminzo projecting In testimony whereof I have hereunto suhinto said longitudinal openings. scribed my name this 20th day of l')eoeml)er,

4. An armature for electric machines, com A. l). 1888.

sisting of plates of magnetizable material 5 stamped With openings and arranged in ALBERT SCII'AIID.

groups, and of alternate groups of plates stamped with openings of a different size or \Vitnosses: shape, the openings in the several groups of \V. l)' UPTEORAFF, plates forming together continuous openin CHARLES A. TERRY.

10 through the armature.