US975478A - Armature-winding for dynamo-electric machines. - Google Patents

Description

E. W. STURER.

ARIEEATUEE WINDING FOR DYNAMO ELECTRIC MAGEZN AIPL-IUAT IOH FILED MAR. 2, 1908.

UNITED sTaTEs PATENT OFFICE.

NORMAN W. STORER, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO WESTINGHOUSE ELECTRIC & MANUFACTURING COMPANY, OF EAST PITTSBURG, PENNSYLVANIA, A CORPORATION OF PENNSYLVANIA. i

ARMATURE-WINDING FOR DYNAMO-ELECTRIC MACHINES.

To all whom 'it may concern:

Be it known that l. Nonnix \Y. S'roiucu. a citizen or the United States, and a resident Specification of Letters Patent. Patented N 15, 191() Application filed March 2, 1908.

Serial No. 418,897.

comprises a spider l which is rotatably mounted on a shaft 2, a preferably lami gnatcd magnctizable core 3, a commutator 4 of Pittsburg: in the county otAllcohcny and State of Pennsylvania, have invented a new and useful Improvement in .\rmai turc windings t'or DynamoJIlcctric Machines, of which the following is :i specificat-ion.

My invention relates to armatures for d ynamo-electric machines, and it has for its object to provide improved means for connecting; armature coils to commutator cylinder segments, whereby excessive heating of the armature structure may be avoided.

In alternating current motors of the commutator type and in some other dynamo electric machines, resistance conductors are frequently employed to connect the armature coils to the commutator segments for the purpose of introducing resistance into the local closed circuits that are formed when adjacent commutator segments are engaged by the brushes.

The resistance conductors are usually composed of German silver or other high-resistance material and are in the form of thin strips or ribbons which, in many cases, are

doubled back upon themselves so that they cannot be conveniently connected to the commntator segments without firstv reducing their section. The resistance conductors are usually located in the armature core slots, under the Winding, inorder that the armature structure may assist in conveying away the heat that is generated in these portions, but the heat generated in the portions of the conductors that lie between the core structure and commutator cylinder cannot be readily dissipated.

In order to reduce the generation of heat, I increase the currentcarrying capacity and reduce the resistance of the ends of the conand a winding The winding 5 comprises a plurality of coils which are partially located in slots (3 in the core member 3, in the usual manner. and are connected to the commutator segments by means of resistance conductors 7.

The resistance conductors, which are preferably of German silver or other relatively high-resistance conducting material, are in the form of ribbons or strips and are disposedv beneath the armature coils in the core slots. The resistance ribbons or strips are relatively wide and are doubled back upon themselves so that it is desirable to reduce the section of each strip near its ends in order to facilitate its connection to the commutator segmentand to prevent interference with the connector which joins its opposite end with one of the armature coils. Since a reduction in the section of acertain portion of each resistance ribbon diminishes the cin'rent-carrying capacity and increases the tendency for heating, I coat the ends of the strips with copper or other conductin material by an electro-plating process an in this way, the current-carrying capacity of the ends is made somewhat greater'than that. of the body of the strips, instead of.

less, while the section 'of the strip is only increased by a very small amount.

The plated portions of the resistance strip 7 are indicated at 8 and 9 and it will be observed that, by this means, the currentcarrying capacity of the strip will be increased and the heating reduced Where the most difficulty in dissipating the heat is found. It is also desirable to increase the -current-carrying capacity of these portions of the resistance conductors in order to avoid fusim the solder in the connectors which join the coils and the conductors and which are adjacent to the reduced section. It is, of course, possible to provide a coating of low-resistance material in various ways, for example,-by a dip 'ing processor by soldering or riveting an brazing stri s onto the flat surfaces of the resistance ri bons and, consequently, I desire that my invention shall not be restricted to any specific means for carrying it into efiect.

I claim as my invention:

1. The combination with an armature winding, and a commutator cylinder, of resistance conductors interposed in circuit 1) tween the winding and the cylinder segments and having reduced end portions provided with means for increasing their conductivitv.

The combination with an armature winding, and a commutator cylinder, of resistance conductors interposed in circuit between the winding and the cylinder seg- 11101115 and havingreduced end portions provided with coatings of conducting material for increasing their conductivity.

3. A resistance conductor having portions of reduced section and coatings of 'rela- I i i t t i t l l g l i t i l tively high conductivity to increase the current-carrying capacity of said portions.

4. The combination with an armature winding, and a commutator cylinder, of resistanec conductors interposed in circuit between the winding and the commutator cylinder segments, and having reduced end portions provided with electrolytically deposited copper coating. for increasing their conductivitv.

In testinnnrv whereof, I have hereunto subscribed my name this 10th day of Felnz, 1908.

NORMAN \V. STORIQH.

\Vi i nessesi Hnmn A. TArLon, ()rro S. SCIIAIRFZR.

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