US1365224A - Armature-core - Google Patents

Description

1. B. BUSHNELL.

ARMATURE CORE.

APPLICATION FILED NOV. 23. ISIS.

Patented Jan. 11, 1921.

I Y M Big. 6'

IN VENTOR. ]0]2nB.Bas/?J2 6'Zl i i ATTORNEY UNITED STATES ATENT OFFICE.

JOHN B. BUSHNELL, OF BERKELEY, CALIFORNIA, ASSIGNOR TO BUSHNELL MAGNETO COMPANY, OF SAN FRBN'CISC'O, CALIFORNIA, A CORPORATION.

ARMATURI]-GORE.

T 0 all whom it may concern Be it known that I, JOHN B. BUSHNELL, a citizen of the United States of America, residing at Iierkeley, in the county of Alameda, State of California, have invented certain new and useful Improvements in Armature-Cores; and I do declare the following to be a clear, full, and exact description of the same, reference being had to the accompanying drawings, and to the characters of reference marked thereon, which form a part of this application.

This invention relates to improvements in magneto construction and particularly to the armature core per 86.

The object of the invention is to produce an armature core which will enhance the output of current from the windings by reason of concentrating the magnetic flux to an iron web, the said web being integral with the solid iron rim pieces. I use silicon steel laminations in my armature to break up eddy currents, these laminations being put in slots cut across and through the rims on each side of the web, the laminations being insulated and then pressed into place. This is all that is required to hold them in position, eliminating the use of screws or rivets which are commonly used in other cores. By eliminating these holding screws or rivets which go transversely through the length of the core I eliminate eddy currents which these screws or rivets cause. It is well known that eddy currents in a permanent magnet machine tend to interfere with or retard the easy passage of the magnetic flux. Eddy currents cause losses through dissipation of heat. It will be seen that by reducing eddy currents and other losses caused therefrom to a minimum, my armature core will give a higher efficiency. Another object of the invention therefore is to produce an armature core which will have a quicker reversal of polarity than other commonly used armatures because of eliminating these eddy currents and losses caused through heat and the dissipation of energy.

A further object is to produce a simple and inexpensive device and yet one which will be exceedingly eifective for the purposes for which it is designed.

These objects I accomplish by means of such structure and relative arrangement of Specification of Letters Patent.

Patented Jan. 11, 1921.

Serial No. 263,835.

the parts as will fully appear by a perusal of the following specification and claims.

On the drawings, similar characters of reference indicate corresponding parts in the several v'ews.

Figure l is a side elevation of the complete core.

Fig. 2 is an end view of the same.

Fig. 3 is a view similar to Fig. l but showing the insulated steel laminations removed.

Fig. 4: is a sectional view taken on a line a-l of Fig. 3.

F ig. 5 is a plan view of the core showing how the center web makes a continuous iron connection between the rim pieces and holds the steel laminations separated on each side thereof.

F 6 is a side elevation of one of the steel laminations.

Referring now more particularly to the characters of reference on the drawings, the numeral 1 designates the rim pieces each being in itself a solid segmental iron piece of equal arcuate width with the other and the two being connected by an integral iron cross web 2, diametrically positioned relative to the segments and extending lengthwise thereof.

Each piece 1 on each=side of the web 2 is provided with a cut in recess 3. con steel laminations l, insulated in the usual manner as at 5, are received into these recesses 3 under pressure. Thus they are frictionally held in place without the necessity of using transversely arranged securing members.

By thus eliminating transverse securing members as commonly used in other cases, I remove an instrumentality tending to produce eddy currents and a consequent dissipation of energy. The current output of a magneto using my improved core will he therefore greatly enhanced.

Thus, from the foregoing description it will readily be seen that I have produced such a device as substantially fulfils the objects of the invention as set forth herein.

While this specification sets forth in detail the present and preferred construction of the device, still in practice, such deviations from such detail may be resorted to as do not form a departure from the spirit The sili of the invention, as defined by the appended claims.

Having thus described my invention, what I claim as new and useful and desire to secure by Letters Patent is 1. An armature core consisting of rim pieces spaced apart, an iron web connecting the same and insulated laminations of metal arranged on each side of the web.

2. An armature core comprising two solid rim pieces spaced apart, an integral iron web connecting the two, the rims each being provided with a recess on each side of the web and insulated metal laminations received under pressure into the recesses on each side of the web, and extending between the rims.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN B. BUSHNELL.

\Vitnesses:

VnRADrNn VVARNER, BERNARD PRIVAT.

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