US1549628A - High-resistance conductor for electrical machinery - Google Patents

Description

Aug. 11, 1925. 1 1,549,628

H. W. TAYLOR HIGH RESISTANCE CONDUCTOR FOR ELECTRICAL MACHINERY Filed Ma rch 27, 1922 2 Sheets-Sheet 1 III/Al'll/I B I e 'lnx/encor'i Henry \Xl. Taylor,

His Attor'n ey.

Aug. 11, 1925.

H. w. TAYLOR HIGH RESISTANCE CONDUCTOR FOR ELECTRICAL MACHINERY 2 sheets-sheet 2 Filed March 27, 1922 Inventor: Henry W Taylor, y

His Attorney.

253 Sl'ATES PATENT OFFICE.

EEENEISZ TAYLOR, on i i-User, rin'oriann, assronon '10 GENERAL nnnormc coivrieaur, a conrona'rron or new roan.

HIGH-RESISTANCE CONDUCTOR, FOR ELECTRICAL MACHINERY.

Application filed March 27, 1922.

To all whom it may, concern:

lie it known that I, HENRY YVILLIAM TAY- noin a subject of the King of Great Britain, residing at Rugby, in the county of Warwiclrshire, England, have invented certain new and useful Improvements in High-Itesistance Conductors r01- Electrical Machinery, of which the following is a specilication.

In certain electrical circuits as for instance in rotors of inductor motors it is desirable that the conductors have a high resistance when carrying current at the normal frequency and a low resistance when carrying current at a low "frequency.

in my United Eitates Patent No. 1,4L-S'L286, I have described improvements in such condoctors of the type in which the conductor consists of two sections, the space between the sections being nearly tilled by magnetic material.

The object of my present invention is to provide further improvements in such conductors and consists essentially in the use of more than two sections for such composite conduuctors the space between the various sections being nearly filled with magnetic material.

hflorc particularly I use such conductors as the upper conductors in the arrangement of sweral multiple conductors as described in my aforementioned patent, and where for instance I use conductor in accordance with my present invention consisting of three parts I pref :ably make the upper and lower sections of a small sectional area, while I make th central section or": a large sectional area.

The eddy currents which are induced in such a conductor are confined to the outer sections and thus a greater multiplying factor is obtained at high frequencies than would be obtained it the whole of the sectional area of such a conductor were divided as previously described in two sections only.

In the accompanying drawings which illustrate my invention, Fig. 1 corresponds to Fig. 2 of my patent above referred to, and shows a slot containing two composite conductors. Figs. 2, 3 and l show diagranr matically the manner in which I use composite conductors in accordance with the present invention in completed windings.

Serial No. 547,064.

In Fig. 1 with two composite conductors A and B see 1 consist of three sections; the

outer sections a and c of the top conductor A, and d and f of the bottom conductor B being of high resistance while the central. sections Z1 and e are of low resistance.

The magnetizing effect of the bottom conductor B will produce a magnetic leakage across the magnetic spaces between the sections (4- b and. c of the top conductor A, and as the induced current in the upper conductor must circulate symmetrically it Will not flow in the central low resistant section Z) but will flow around the high resistant outer sections a. and 0 thus increasing the effective resistance of the whole winding at high frequencies. 7

It will be understood, however, that I do not confine mysel'l to the use of similar constructed conductors at different positions in the slot and in the lowermost conductor of a slot containing many conductors, and more particularly in the lowest conductor of all I may not in certain forms of winding divide the conductor into more than two sections.

Fig. 2 corresponds approximately to the form of winding shown in Fig. 3 of my patent above referred to, in which for the sake of example I have shown a winding consisting of short circuited coils, the side of the coil corresponding to the upper conductor in the slot consisting of three sections of the type shown in Fig. 1, while the side of the coil corresponding to the bottom ot the slot consists of two sections only. The distance Jetween the dotted lines shown in Figs. 2 and i indicate the distance between consecutive poles.

Fig. 3 corresponds substantially to Fig. 7 of my patent above referred to, and in this fig ure I have shown a short circuited coil consisting of two complete turns, each conductor consisting of three composite sections, there being no electrical connection between the sections throughout the coil. In this winding I have arranged the order of connections between sections of various conductors in such a manner that the current generated beaween the outer section of the upper conductors by the magnetizing ellect of the currents in the lower conductors becomes cumulative. This current flows only in the outer high resistant sections of the conductor, while the center section of low resistance has no such circulating current generated at high frequency.

Finally Fig. 4; illustrates a so-called squirrel cage type of winding in which the sections of the conductors from all slots are joined to common end bars at each end of the core. This figure corresponds to Fig. 8 of my patent above referred to.

\Vhat I claim as new and desire to secure by Letters Patent of the United States, is,

1. A Winding tor a slotted core dynamo electric machine comprising two or more composite conductors per slot, each composite conductor containing more than two sections which are situated at dilierent depths in the slot and separated from each other by a magnetizable medium, the outer sections of each composite conductor being of higher resistance than an intermediate section thereof.

2. A secondary M a dynamo electric machine ot the induction type con'iprising a slotted magnetic structure and a plurality of composite conductors at different depths in the slots, each composite conductor consisting of at least three sections at different depths in the slot, the outer sections of said composite conductors being of higher resistance than an intermediate section.

A secondary ot' a dynamo electric machine con'iprising a slotted magnetic structure, a plurality of composite conductors at different depths in the slots, each composite conductor comprising at least three sections separated from each other and situated at diflerent depths in the slot, the outer sections of said composite conductors heing materially smaller in cross section than an intermediate section.

4:. A secondary member of a dynamo electric machine of the induction type comprising a slotted magnetic stri'icture, a plurality oil composite conductors at different depths in said slots, each oi. said conductors comprising at least three sections at ditterent depths in the slot, an intern'iediate section of the comluetors being of smaller resistance than the outer sections, and end connec tions for connecting sections of different conductors in closed windings.

In witness whereof, I have hereunto set my hand this seventh. day of March, 1922.

H. V. TAYLOR.

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