US396195A - Armature for dynamo-electric machines - Google Patents

Description

(No Model.)

L. DAET.

ARMATURE FOR DY NAMO ELECTRIC MACHINES.

Patented Jan. 15,1889.

Jmramfcrr; V 2214 ZM UNITED STATES PATENT OFFICE.

LEO DAFT, OF PLAIXFTELD, NElV JERSEY.

ARMATURE FOR DYNAMO=ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 396,195. dated January 15, 1889.

Application filed November 12, 1885. Renewed May 1, 1888. Serial No. 272,855. 1N0 niodebl To all whom it may concern.-

Be it known that I, LEO DAFT, a subject of the Queen of Great Britain, and aresident of Plainfield, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in Armatures, of which the following is a specification.

My invention relates to dynamo or magneto electric genera-tors or motors; and it has for its object to improve the mechanical construction of the armature-cores of such machines, so as to render them strong and firm, and to furnish them with means for the rigid attachment of the spider-arms that support the core and to hold it in proper position while under heavy strain, and at the same time permit the ready removal of the armature-shaft without disturbing the electrical connections.

To these ends my present invention consists of an armature-core constructed substantially as more particularly pointed out hereinafter.

Referring to the accompanying drawings, Figure 1 is an end view of a core, showing the outer ring and spider-arms. Fi 2 is a side view, partially in section. Fig. 3 is a similar view showing a modified core or cylinder.

Great difficulty has been heretofore experienced in properly supporting the core of armatures in machines used for heavy work, such as on electric locomotives and the like, where the machine has to be started and stopped frequently and is under great strain. Numerous attempts have been made to overcome these mechanical objections, and they have usually resulted in the use of large masses of magnetic material in and around the core and windings, which is very objectionable, as the said material tends to weaken the effect of such machines by the formation of the so-called Foucault currents, which not only waste the magnetic effect of the machines, but cause heating of the parts, which interferes with the proper operations of the machines.

It is usual to form the core or cylinder of some material, or in some arrangement of parts, so that the evils of these currents are overcome; and in the accompanying drawings Ihave shown thebodyof the core H in Fig. 2 as made up of soft-iron wire and supported between the rings and in Fig. 53 the body H of the core is made up of soft-iron rings or washers alternating with similar forms of insulating material and having the rings C at the ends. These rings C, I form of some diz'unagnetic material-such as phospln'irbronzeand these furnish an outer peripheral surface of the core, which may be readily turned true to afford a suitable finindation for the coils of wire forming the armature.

It has been customary to support the core or cylinder upon SPltlQlf-Z'll'lllS attached directly to the peripheral rings 0 in various ways; but I have lonnd Ihal a much stronger and satisfactory means of supporting the core in the construction shown in the drawings, and which I am about to describe.

Between the core ll and the ring C, I intcrpose a ring, A, composed of? phosphorbronze or other suitable material, preferably of a diameter to correspond to the periphery of the armatn re when the wires are applied,

and cast or formed integral with this ring are'the arms B 13, projecting laterally therefrom. These arms fit in slots or recesses formed or milled into the outer edge of the ring (1, and extend outward to the spider-ring D, which is mortised or recessed to receive the ends of the arms and to insure the proper centering of the armature-shalit upon which the spiders are secured. These arms are secured in place in the recesses by any suitable and well-known means.

From this construction it will be obvious that there is a strong and rigid connection between the spiders and the core without the use of any screws or bolts that will be liable to work loose and destroy or injure the armature by grinding between the periphery of the armature and the interior of the fieldmagnets, and that the parts of the armature will be held in place and still maybe readily removed from its shaft without liability of disturbing the insulatiini of the windings thereon.

I claim 1. An armature consisting of a cylindrical core, rings connected to the core and having out-wardly-extending arms, and spiders connected to said arms, substantially as described.

2. The combination, with the core, of a termediate ring having integral arms, also of diamagnetic material, and spider-arms connected to the intermediate ring supporting the core, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses. I

LEO DAFT.

Witnesses:

J NO. N. BRUNs, F. HOLLY REED.

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