US628050A - Armature for dynamo-electric machines. - Google Patents

Description

Y No. 628,050. Patented July 4; |899.

H. H. WAIT.

ABMATURE FOR DYNAMU ELECTRIC MACHINES.

(Application filed June 10, IBDBJ (No Model.)

UNITED 'STATES PATENT FEICE.

HENRY H. WAIT, OE CHICAGO, ILLINOIS, AssIeNoR To THE WESTERN ELECTRIC COMPANY, OE SAME PLACE.

`RVIATURE FOR DYNAIVlO-ELETRIC MACHINES.

srECIFICATIoN forming part of Letter-s Patent No, 628,050, dated July 4, 1899. Application filed June 10,1898. Serial No. 683,065.. (No model.)

Tol (all whom, it 'nm/fj con/cern:

Be it known that I, HENRY IIVAIT, a citizen of the United States, residing at Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful Improvement in Armatures for Dynamos, (Case No. 11,) of which the following is a full, clear, concise, and exact description.-

My invention relates to dynamo-electric machines of that class employing iron-clad armatures, and has for its object the improvement in the construction of said armatures to obviate certain defects heretofore existing and to simplify the construction of the armature.

The invention, generally speaking, may be said to consist in an armature having a core of magnetic material provided with a plurality of coil-receiving grooves, each groove being provided at its longitudinal opening with a plurality of longitudinally-separated lugs integral with said core, a retaining-strip of non-magnetic material being preferably in terposed between said lugs andthe arm ature'- wire within the grooves. By this construction I am enabled to reduce the self-inductive effect in the arm attire-coils, thereby reducing the sparking at the comm utator-brushes upon change of load, while at the same time bandwires for retaining the armature-coils in position against the action of centrifugal force may be dispensed with.

I will explain my invention more particularly by reference to the accompanying drawings, which illustrate the preferred embodiment thereof.

In the drawings, Figure l is a longitudinal sectional view of an armature core constructed in accordance with my invention. Fig. 2 is a partial elevation thereof, portions being broken away to reveal more clearly the construction of the armature. Fig. 3 is a plan view of a portion of the armature shown in Fig. l. Fig. 4 is a cross-sectional view of a portion of the armature on line 4 4 of Fig. l. Fig. 'is a cross-sectional View of a portion of the armature on line 5 5 of Fig. l.

Like letters indicate like parts throughout the diiferent views.

The armature-core Ct is preferably of iron and composed of a number of laminze assemerably of the crosssection shown in Figs. 2, 1

4, and 5. In Figs. 4 and 5 a diaphragm of insulating material e is shown between different parts of an armature winding. Each coil-receiving groove is also preferably provided 'with a liningf of insulating material. The core plates or laminze are preferably stamped in the desired shape, some of the plates in each core being provided with inwardly-prog ectin g lugs dd', which serve partially to close the coil-receiving grooves, sufiicieut space being left between the opposing lugs forV the passage of the armature-wire. The lugs are longitudinally separated, so that increased air-gaps are provided at intervals along the grooves between the separated lugs to increase the magnetic reluctance to throttle the lines of force which are set up in the metal surrounding the grooves and to reduce objectionable reactions between the armature and the fields.

After the armature-wire hasbeen placed within the grooves retaining-strips g of nonmagnetic material, as wood, are driven in a longitudinal direction between the lugs and the armature-wire. Sufiicient lugs CZ are to be provided along the longitudinal openings of the coil-receiving grooves to prevent the retaining-strips and the armature-wires from bulging outwardly. By stamping a number of plates in each core with lugs and properly distributing such laminae throughout the body of the core the retaining-lugs may be made integral with the core at minimum cost. I preferably provide each wall of each groove with the retaining-lugs, the lugs being preferably placed opposite each other, as shown.

IOO

1.' The combination in a dynamo-armature,

. c-f thin disks forming the core thereof having similar peripheral recesses forming coil-channels in the armature, a large proportion of said disks having a diameter substantially equal to the outer diameter of the coils, and the remainder being of greater diameter and having inwardly-projecting lips formed in the said recesses at the peripheries of these disks; whereby the coils are retained in place but the selfinduction of the coils is not substantially increased, substantially as described.

2. In a laminated armatureLthe combination of the disks forming the core thereof having teeth projecting from the peripheries thereof forming coil-channels, a large proportion of said teeth having alength substantially equal to the depth of the coil and the remaining teeth being of the same form but of greater length and having projections formed at their extremities contracting the opening to the coil-channel whereby the coils are retained in place by said longer teeth, While the self-induction of the coils is not substantially increased, substantially as described.

3. In an iron-clad armature for dynamoelectric machines, the combination of disks having projecting teeth of substantially the same length as the space occupied by the coil, With disks having similar teeth projecting farther than the others adapted to hold blocks or Wedges, whereby the coils are retained in place, substantially as described. y

In Witness whereof Ihereunto subscribe my name this 19th day of May, A. D. 1898.

HENRY H. WAIT.

Witnesses:

GEORGE L. CRAGG, A. LYNN LAWRENCE.

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