Search Images Maps Play YouTube News Gmail Drive More »
Sign in
Screen reader users: click this link for accessible mode. Accessible mode has the same essential features but works better with your reader.


  1. Advanced Patent Search
Publication numberUS640760 A
Publication typeGrant
Publication dateJan 9, 1900
Filing dateNov 14, 1898
Priority dateNov 14, 1898
Publication numberUS 640760 A, US 640760A, US-A-640760, US640760 A, US640760A
InventorsHenry Geisenhoener
Original AssigneeGen Electric
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Inductor dynamo-electric machine.
US 640760 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

No. 640,760. Patented Jan. 9, 1900. H. GEISENHONER.


pplication file v. 14, 1898.)

(No Model.)

iNVEN U 1*[enr (leis enb'o'ner. M 4% UNITED STATES PATENT OFFICE.



SPECIFICATION forming part of Letters Patent No. ,7 dated January 9, 1900- Application filed November 14,1898. Serial No. 696,333. (No model.)

To ctZZ whom it may concern:

Be it known that I, HENRY GEIsENHoNEE, a citizen of the United States, residing at Schenectady, in the county of Schenectady, State of New York, have invented certain new and useful Improvements in Inductor-Dynamos, (Case N0. 482,) of which the following is a specification.

My present invention relates to the con struction of inductor-dyna mos, and more particularly to the revolving inductor of such machines. In practice these machines are sometimes driven at very high speeds, and it has been found that they set up a very disagreeable howl or vibration. Many attempts have been made to remedy this difficulty, some of which have lessened it, but none of which have been entirely successful. It has been due to a great extent to the shape of the inductor, which sets up harmonic vibrations in its revolutions. It is the object of the present invention to prevent this by building out the inductor to a substantially cylindrical form with materials to some extent at least non-resonant in character. It is manifest that most materials except metals are unsafe on account of the centrifugal stress to which these structures are subjected. I prefer, therefore, to build the iron part of the inductor of the usual laminated construction and attach it to a solid metallic body, filling the cut-awaypart of the iron structure with laminations of brass and some non-resonant insulating material, such as compressed fiber. By this arrangement I am enabled to check to a great extent harmonic vibration, so that the noise from the alternator is minimized and in machines of ordinary sizes eliminated. At the same time by dovetailing the parts together I get a structure which is capable of enduring the strain of the highest speeds used in these machines.

The accompanying drawings show my invention.

Figure 1 is a section of an inductor-alternator with a part of the revolving inductor shown in side elevation, and Fig. 2 a section through the revolving inductor.

In Fig. 1, A. is the shaft of the machine, of which Bis the armature-frame. M is one of the armature-coils, C C the field-magnet winding, and D is the armature-iron. These parts are old and of any well-known construction.

The revolving inductor consists of a solid approximately cylindrical body of metal G, to which the inductonpoles E are secured by dovetails and the usual end plates F F and rings II threaded upon the body G. At 1 I are shown the non magnetic laminations, which are preferably of brass or gun-metal and are separated by insulation, such as hard fiber K. I

The configuration of the different parts will be better understood from Fig. 2, in which E is one of the laminations of the inductoriron, provided with dovetails e e, which mesh with a similar construction on the inductorbody G The brass or gunmetal plates I are also provided with dovetails 't', which fit into proper grooves on the inductor-body and into the pole-pieces. To lessen the Weight and the consequent centrifugal strain, openings t" t" are made in the brass and fiber plates. These openings also serve to still further eliminate eddy-currents and to cool the in ductor.

\Vhat I claim as new, and desire to secure by Letters Patent of the United States, is-

l. The combination with an inductor having radial pole-pieces, of a light, hollow, nonmagnetic cooling structure secured to the indoctor, and filling the spaces between the pole-pieces to present with the latter a substantially cylindrical surface.

2. A rotatable inductor with radially-extending pole-pieces and provided with alternate layers of non-magnetic metal and nonresonant insulation, which fill the spaces between the pole-pieces.

3. In an inductor, the combination ofa supporting-core, laminated poles secured to the core, and intervening plates of alternate insulating material and non-magnetic metal secured to the core and filling out the space between the poles so that the envelop of the inductor is substantially a cylinder.

4. The combination in an inductor, of the supporting-core, the laminated iron forming the pole-pieces dovetailed to the core, and the plates of non-magnetic metal, such as brass,


and of insulation, dovetailed to the core and the pole-pieces; the whole forming substantially a cylinder.

5. The combination with an inductor having radial pole-pieces, of non-magnetic material interlocked with the inductor structure and filling the spaces between the polepieces.

6. A rotatable inductor comprising a separate core, radial pole-pieces, and non-magnetic material interlocked with said core and pole-pieces and filling the spaces between the poles.

7. A rotatable inductor comprising a separate core,pole-piecessecured thereto,and nonmagnetic material secured to the core and filling the spaces between the pole-pieces.

8. A rotatable inductor comprising a separate core,-pole-pieces secured thereto,and non- In witness whereof I have hereunto set my hand this 12th day of November, 1898.

HENRY enisnnnonna.



Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US4631435 *Dec 18, 1985Dec 23, 1986The Garrett CorporationConsequent pole permanent magnet rotor
US5909076 *Aug 26, 1997Jun 1, 1999Lucent Technologies Inc.Magnetic commutation alternator, method of manufacture thereof and wireless infrastructure employing the same
US6590311 *Jun 9, 2000Jul 8, 2003General Electric CompanyCross-shaped rotor shaft for electrical machine
Cooperative ClassificationH02K19/24