US1876670A - Inductance coil - Google Patents

Description

Sept. 13, 1932.

R. M. HEINTZ 1 ,876,670

INDUC'IANCE COIL Filed April 25, 1932 INVENTOR, RALPH M. HE/NT'Z.

M KW ATTORNEY Patented Sept. 13, 1932 UNITED STATES PATENT OFFICE RALPH M. HEINTZ, F PALO ALTO, CALIFORNIA, ASSIGNOR T0 I-IEINTZ KAUFMAN, LTD., OF SAN FRANCISCO, CALIFORNIA, A CORPORATION OF NEVADA mnuc'raucn con.

Application filed April 25,

My invention relates to inductance coils used in radio frequency transmission and reception, and more particularly to a coil whose principal support is included in the electrical circuit of the inductance.

Among the objects of my invention are: To provide an inductance coil and support of high electrical efficiency; to provide an inductance coil which will carry large amounts of radio frequency power without eddy current losses in its supports; to provide an. inductance coil whose supporting structure is a substantial part of the electrical circuit; and to provide an inductance coil whose supporting structure adds materially to its inductance.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a. part of this specification, but I do not limit myself to the embodiment of my invention herein described, as various forms may be adopted within the scope of the claims.

Referring to the drawing Figure 1 is an end view of a preferred form of my invention.

Figure 2 is a view largely in elevation, the plane of projection being indicated by line 2-2 of Figure 1.

One of the main problems in mounting inductors used for high power radio communication, particularly those of large size and weight, has been the losses encountered in the supporting structure. Circulating currents of large amounts are set up in conductive supports which not only detract from efficiency, but often completely change the inductance characteristics of the coil. Insulating supports of high dielectric strength are often of poor mechanical strength and are subject to dielectric losses.

My invention allows the use of strong metal supports for the largest of inductors, without the usual losses. Broadly speaking it comprises an inductor having its support in the form of a split turn, whose ends are fixed to a panel. The entire split turn is included in the inductor circuit, becoming an actual part of the field-forming structure.

A preferred embodiment of this invention 1932. Serial No. 607,295.

is shown in the drawing, and will now be discussed in detail. The ends of a split turn 1 are preferably provided with integral legs 2. The termini of these legs are tapped, and bolts i and nuts 5 fasten the turn solidly to a panel or other base structure 6. The periphery of the turn has receptacles 7 preferably formed integral with it, which receive and hold insulating bars 9.

These bars may be of any material of high dielectric strength such as bakeli'te, isolantite, or pyrex glass. While I have shown seven bars in the drawing, the exact number is determined by the size of the turn, and the strength of framework desired.

Two split turns are preferably provided, identical in size and shape, the insulating bars connecting them. On the framework thus formed is mounted a helix 10, preferably of edgewise wound copper ribbon. 30 At each end the helix is fastened to one leg of the split turn by means of connection bolts 12. The opposite leg of the split turn is connected to wire 1a which leads to the source of power.

When the end connections of the helix are made to the split turn, the helix wire crosses over one leg of turn 1 and connects to the other leg. By this the split turn becomes a turn of the entire inductance, a continuation of the helix spiral, and the inductance of the split turn is added to that of the helix. When radio frequency is circulated through the entire inductor there is no extraneous support material in the field wherein eddy currents may develo}. The inductance of the coil complete with its support may be readily calculated, and is not made subject to correction from field distortion and drainage loss.

Large amounts of radio frequency power have been used in inductances of my invention without the development of hot spots, or other eddy current losses, in the supports. High efliciency and economy has been obtained in commercial practice.

I claim:

1. An inductor comprising a conductive supporting turn, an insulating frame mounted on said turn, a conductive helix woundon said frame, said supporting turn forming a continuation of said helix.

2. An inductor comprising a casting in the shape of a. single turn, an insulating framework mounted on said casting, a helix wound on said framework, said casting :forming an end turn and support for said in ductor.

8. An inductor comprising a split turn, means for fastening the ends of said turn to a panel, an insulating framework mounted on said turn and supported thereby, and a helix wound on said framework, and electrically connecting said split turn to said helixso that the inductance of the split turn is added to that of the helix.

4. An inductor comprising a split turn, means for attaching the ends of said turn to a panel, receptacles on the periphery of said turn, insulating bars forming a framework held hy said receptacles, a helix wound on said framework, and means connecting said split turn to said helix so that the inductance of said split turn is added to that of the helix.

5. An inductor comprising a split turn, projections on the end of said turn, means for fastening the termini of said projections to a panel, receptacles on the periphery of said turn, insulating bars held by said receptacles, a helix wound on said bars, and means connecting said split turn to said helix so that the inductance of said split turn is added to that of the helix.

In testimony whereof, I have hereunto set my hand.

RALPH M. HEINTZ.

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