US931541A - Electromagnet-coil construction. - Google Patents

Description

M. J. WOHLKS; H. HERTZBERG.

LEGTROMAG-NET COIL CONSTRUCTION.

'APPLIOATION FILED Nov.18,19oa.

@i u atente; Aug; 1'?, i909.

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.that thel insulation will not be destroyed by "the heat generated in the coil by the passage .winding` turns ot bare aluminum wire z ller- Unirnn siti-iras rarest MAURICE J. WOHL, OF NEW YORK, AND HARRY HERTZBERG, OF BROOKLYN, NEW YORK, AtjJGNORS TO ABBOT A. LOW, OF HORSESIIOE, NEW YORK, MAURCE J. WOHL, OF

YORK, N, Y., AND HARRY HERTZBERG, OF BROOKLYN, NEW YORK, TRUSTEES.

ELECTROM G NE T-OOIL CONSTRUCTION.

To all whom it may concern:

Be it known that we, Maintien J. lilVonL and i-ixnav -lnn'rznnno, citizens ot' the United States, and residents, respectively, otl the city ot New York, borough ot` idanhattan, county and State ot New York., and of the city otx New York, borough ot' Brooklyn, county of Kings, and State of New York, have invented certain new and useful Improvements in Electromagnet-Coil Construction, of which the following,` is a speciiication;

This in\ 'ention relates .o elect-romagnet coil construction and has 'for itsl object the provision ot means for insulating` the turns ot' wire trom one another in such a manner of the currenttherethrough or otherwise.

The object of the invention is to avoid the difficulty experienced in electroinagnet coils in which the ordinary insulating wire is used ot the insulation being destroyed when the coil excessively heated.

- It further object ot the invention to simplify and cheapen the coil construction by en'iploying bare wire instead ot the usual insulated wire. l

in the drawing acconipanyingthis specitication like parts in the several views have Figure l a side elevation, partly in sec tion, showingv the several layers of wire in position. Fig. l is a view similar to Fig. l, showing` the coil after the saine has been in use. Fig'. 23 shows the couumsite insulating strip. V

A. spool upon which the electromagnet coil wound is shown at l. rThis spool may be ot' any approved eonstruetiou and upon the same ,is wound successive turns ot the conductor for the operating current, preferably of copper wire, as shown at Between these successive turns ot the conducting winding positioned successive turns of an insulator. This insulator is lshown in the drawing at 3 and preferably t'ormcd by nateiy with the turnsI ot the couductiue'l wire 2.

he aluminum wire oxidizes readily when exposed to the air, especially it some uioisi Specification of Letters Patent.

Application tiled November 1B, 1998.

Patented Aug. 17, 1909.

serial No. 463,235.4

ture is present, and the oxidation is accelerated when the wire is heated. This forms an insulatingr coating of oxid for the aluminum wire having sullicient insulating properties to insulate the successive turns of the conducting wire 2 troni one another. It is understood in electromagnet coil construction for any ordinary purposes that the difterence in potential or drop between two successive turns of the coil is very small and it has been found by actual tests that a coil wound with bare wire for the conducting winding and having alternateiy positioned therewith turns ot bare aluminum wire with coating ot oxid, as described, will operate successfully and will possess the very desirable property ot being able to withstand ef;- cessive heating` faused by an unusual amount 7b of current or from other sources without breaking down. In fact the effect ot' the heating. as already explained, is to accelerate and increase the formation of the insulatinp, coating of oxid.

vWhere the coil is composed oit a plurality oi layers of winding, theselayers may be insulated Yfrom one another by interposinf.)r between the saine a strip ot insulating inaterial. This is preferably a composite strip comprising a central layer of mica and outer layers ot a combustible material, such as paper or cloth. Such a strip is shown in Fig'. 3. x

rlhe mica torms a goed insulator, but is so brittle that it is practically impossible to wind or place the same in position upon the successive layers of wire but by using a coinposite. strip constructed as described, this is easily accon'iplished as the strip in ay be Si) readily wound upon the successive layers of wire, as shown in the drawings.

tui-ther advantage obtained by using a composite insulating strip such as described that when the coil becomes heated the outer layers l'ieiugv oit combustible nlaterial burn away leaving the layer of inicain place. This provides an additional space which permit-s the turns of the winding to become separated somewhat, thus increasii'g'uo" the. insulating elt'ect. Y

Fig. l shows a coil such as described betorc use and Fit'. 2 shows the same. coil after the saine has been used and heated. aud the is A i 931,541

combustible layers burned away from the strip between the layers of the winding, the eectbeing, of course, somewhat exaggerated vin mler to show the separation of the turns of the Winding, etc., in the drawing.

It will be understood that the foregoing description and drawing are intended to show a preferred embodiment of the invention for the purposes of illustrating the same and the insulator or insulating winding has been described as aluminum wire which is oxidized on its surface. It is not to be understood, however, that the invention is limited in this respect to any particular material or to the particular form of coil or Winding shown and described, as it Will be evident that many changes may be made in the details of construction shown and described wlithout departing from the scope of the invention.

What We claim is:

1. An electromagnet coil Wound with alternate turns of copper Wire and aluminum Wire.

2. The method of making an electromagnet coil which consists in Winding alternate turns of bare Wire, one forming a conductor for the current passing through the coil and the other forming an insulator between the successive turns.

3. An electromagnet coil comprising a plurality of layers, each layer having successive turns of a conducting Winding alternately positioned with successive turns of an insulator, and a compositestrip located be tween said layers comprising a central layer of insulating material and outer layers of combustible material.

l. The method of making an electromagnet coil which consists in Winding a pluralit-y of layers, each layer having successive turns of a conducting winding alternately positioned With'successive turns of an insulator, and successively Winding upon said layers a composite strip comprising a central layer .of insulating material and outer layers of combustible material.

Signed at Brooklyn, N. Y. city, in the county of Kings and State ofNeW York, this 16th day of November, 1908.

A. LAURENT, Grao. TELLING GIDnrNos.

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