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Transactions of the American Institute of Electrical Engineers, Part II: Applications and Industry

Issue 4 • Sept. 1953

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  • Power equalizer systems for aircraft alternators

    Publication Year: 1953, Page(s):209 - 217
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (705 KB)

    For efficient parallel operation of alternators it is necessary that both real and reactive load be distributed equally among the alternators. A 400-cycle a-c aircraft electric system presently in use employs both reactive and real power equalizers which are interconnections of the respective voltage and speed regulating systems of the paralleled alternators, giving an automatic correction for loa... View full abstract»

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  • A-C versus D-C power for underground mines

    Publication Year: 1953, Page(s):217 - 222
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (574 KB)

    In this paper a comparison will be made of a-c and d-c systems and motor characteristics, the merits of power-factor correction will be discussed, the possibilities and effects of a good choice of conductors will be examined and the solutions to simple a-c distribution problems will be offered. View full abstract»

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  • Open-loop frequency response method for nonlinear servomechanisms

    Publication Year: 1953, Page(s):222 - 225
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (361 KB)

    This paper develops a useful graphical representation similar to the common Nyquist diagrams for the measured or calculated open-loop frequency response data of nonlinear systems.1,2,3,4 This representation indicates the frequency response characteristics and other phenomena such as limit cycles5 and response hysteresis, or jump phenomenon,6 of closed-loop systems. Likewise, this open-loop represe... View full abstract»

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  • Controlling D-C arcs

    Publication Year: 1953, Page(s):225 - 230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (863 KB)

    A method of controlling d-c power arcs is presented, with the emphasis on eliminating retrogressive motion of the arc. Stills from motion pictures of power arc interruptions in a normal atmosphere present the fundamental nature of arc retrogression. The various characteristics of an arc which cause such motion are detailed, and countered by simple design principles. Control of the arc reduces eros... View full abstract»

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  • Change in resistance of aircraft current limiters and its effect on current division in networks

    Publication Year: 1953, Page(s):231 - 238
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (659 KB)

    When an aircraft current-limiter element is subject to sufficient overcurrent, it heats and finally melts, thus interrupting the circuit. The ohmic resistances of limiters at the instant before melting have been measured in the laboratory and have been found to be about 5.2 times the cold resistance, for copper-element limiters, and about 4.2 times the cold resistance for silver-element limiters. ... View full abstract»

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  • Design of transformers for resistance welding machines

    Publication Year: 1953, Page(s):238 - 243
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (562 KB)

    A discussion of transformer design and characteristics would have been a rather controversial subject 15 years ago, as in those days the name-plate kilovolt-ampere rating of the transformer meant little other than that it was printed in English. Oftentimes in the early years, if the power companies limited the maximum connected kilovolt-amperes for a particular installation, a machine was supplied... View full abstract»

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  • Describing function method of servomechanism analysis applied to most commonly encountered nonlinearities

    Publication Year: 1953, Page(s):243 - 248
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (496 KB)

    Most of the literature dealing with the analysis and synthesis of servomechanisms confines itself to treating only linear systems in which all relationships can be expressed mathematically in the form of ordinary differential equations. However, in actual practice many systems are encountered containing elements which exhibit marked nonlinearities. The principal reason for ignoring such nonlineari... View full abstract»

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  • Aircraft protection from thunderstorm discharges to antennas

    Publication Year: 1953, Page(s):248 - 254
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (648 KB)

    The transport aircraft is inherently provided nearly complete thunderstorm-discharge protection by the metal fuselage, which forms a safe path for discharge currents that the aircraft may intercept. External elements such as movable surfaces and antennas can be protected. Airline experiences have shown that antennas frequently intercept discharges; a current surge conducted along the antenna lead-... View full abstract»

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  • Commutation of low-voltage D-C aircraft generators

    Publication Year: 1953, Page(s):254 - 262
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (687 KB)

    A considerable number of failures of d-c aircraft generators are caused either directly or indirectly by unsuccessful commutation. Difficulties encountered are related either to electromagnetic design features of the machine or to mechanical or chemical-physical phenomena in connection with the commutator, brush holders, and brush material. In the following, some of these features bearing upon the... View full abstract»

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  • Optimization of nonlinear control systems by means of nonlinear feedbacks

    Publication Year: 1953, Page(s):262 - 272
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    The first portion of this paper is devoted to the logical selection of a category of nonlinear systems ¿ systems having: 1. controllers with any number of time lags or leads, and usually operating in their saturated region (velocity saturation, force saturation, etc.), and 2. loads consisting of combinations of nonlinear masses, nonlinear dampers, and nonlinear springs. (Nonlinearities which invo... View full abstract»

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Aims & Scope

This Transaction ceased production in 1963. The current retitled publication is IEEE Transactions on Industry Applications.

Full Aims & Scope