US887521A - Dynamo-electric machine. - Google Patents

Description

No. 887,521. PATENTED MAY 12, 1908.

H. G. REIST.

DYNAMO ELECTRIC MACHINE. APPLICATION FILED JAN. 24, 1903.

. JI|VII"INIIIIMIII IMIL INVENTD Henry G Heist.

UNITED STATES PATENT OFFICE.

HENRY G. REIST, OF SGHENEOTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COM- PANY, A CORPORATION OF NEW YORK.

DYNAMO-ELECTRIC MACHINE.

Specification of Letters Patent.

Patented May 12, 1908.

Application filed January 24, 1903. Serial No. 140,369.

T all whom it may concern:

Be it known that I, HENRY The pole pieces C have substantially par- G. RE1sT,a allel sides and shouldered horns 6 for the recitizen of the United States, reslding at ception of the spools of copper wire 7, and

Schenectady, county of Schenectady, of New York, have invented certain new and useful Improvements in Dynamo-Electric Machines, of which the following is a specification.

'My invention relates to dynamo electric machines, and especially to the high speed revolving field type.

It is well known that the factor which determines the size and speed of the more powerful dynamo electric machines is the capacity of the revolving parts to withstand the stresses produced therein by the centrifugal forces, and that as these machines have been built heretofore it has been impossible to run them at as high speeds as many other kinds of machines of corresponding sizes have been driven.

The object of my invention is to provide a revolving field with its component parts so interconnected that it will withstand the The invention will be more readily understood by reference to the accom anying drawing forming a part of this speci cation, in which Figure 1 is a top lan of a portion of a horizontally revolving held with the end late removed and one of the pole pieces siown in section; Fig. 2 is a perspective view of a frag ment of the field core showing the lower end of a dovetailed recess with the friction plate and a key in position.

The central support of the revolving field consists of a spider A having the outer ends of its arms expanded in arcs of a circle and provided with a plurality of dovetailed transverse grooves 1. The grooves 1 are spaced equidistantly, and are adapted to receive dovetailed projections 2 from the inner edges of the laminae 3 constitutin the field core B. The laminae 3 are made in siiort sections and each is provided with two or more dovetailed projections 2, and they are assembled so as to break joints, whereby a very strong and substantially continuous core is formed. The outer edges of the laminae 3 are shaped so as to form flat faces 4 in the outer eriphery of the core B, and have dovetai ed recesses 5 cut therein for the reception of corresponding projections from the pole pieces O.

stress produced by greatly increased speeds.

State are composed of laminae 8 and end plates bolted together in the usual manner. The laminae 8 are each provided with two dovetailed projections 9 corresponding to the dovetailed recesses 5 in the field core, but of somewhat less extent to provide spaces for locking keys 10 and 11 and friction strips 12. On account of the practical impossibility to bring about exact registry of both projections 9 of a pole piece with their recesses 5, slots 13 are cut in the middle of the laminm 8 from the inner edges to near the outer edges to render them flexible, so that both projections 9 may be forced home in their respective recesses 5 by the keys 10 and 11. The key 10 is made much thicker than key 11, the thin end of key 10 being substantially 1 equal to the thick end of key 11, so as to provide sufficient stock to prevent swaglng of the small end of key 10 when struck upon to remove the key. The slots 5 are formed in. the core laminae by punching, and as a consequence the sides of the recess formed thereby in the assembled core are more or less ragged and would tend to cut the surface of key 10 if driven in contact therewith; in order to prevent such cutting action I provide a thin friction strip 12 between the side of the recess and the driven key 10.

The pole pieces O with their coils of copper wire often weigh sevenl thousand pounds each, and accordingly render their assemblage with the core B more or less diflicult. In order to facilitate the assemblage of these parts I provide means for arresting and supporting the pole pieces O in proper relation to the core B consisting of steps or stops located at the lower ends of the recesses 5 in the core B upon which the projections 9 of the pole pieces and the stationary keys 11 may rest while the keys 10 are being driven home. These steps are formed by omitting the notches 5 in the lowermost laminae of the core B, or by providing only small slots 14; for the passage therethrough of driven keys 9 and the friction strips 12, as indicated in While I have shown my invention as applied to a particular form of dynamo, it is apparent that it is in no Way restricted thereto, and it is capable of many changes and modifications Without departing from its spirit or scope.

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

1. The combination of a rigid core and a flexible pole piece connected thereto by a plurality of dovetail joints.

2. The combination of a rigid core and a pole piece slotted transversely and connected thereto by a pair of dovetail joints, located one on each side of the transverse slot.

3. The combination of a laminated core, a laminated pole piece connected thereto by an interlocking joint, keys to lock said joint, and means to prevent the laminae from cutting said keys.

4. The combination of a recessed core, pole pieces provided with projections adapted to enter said recesses, and steps provided at the ends of said recesses to support said pole pieces.

5. In combination, a rigid core member and a flexible pole piece member, one of said members being provided with a pair of dovetail recesses, and the other of said members being provided with a pair dovetail projections.

6. In combination, a core member, a pole piece member formed in two main parts flexibly connected together, and separate means for securing each of said parts to the core member.

7. In combination, a recessed core, a pole piece provided with a projection which enters a recess in said core, a stop located at one end of said recess whereby the passage of the projection of the pole piece through the recess is prevented, and a locking device for securing the projection 011 the pole piece in the recess, said stop being formed so that it does not interfere with the insertion of the locking device in the recess from either end thereof.

In witness whereof I have hereunto hand. this 23rd day of January, 1903.

HEN RY G. REIST.

of corresponding set my Vitnesses:

BENJAMIN B. HULL, HELEN ORFORD.

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