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

Issue 6 • Date Jan. 1959

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Displaying Results 1 - 25 of 38
  • Temperature of conducting ribbon magnet coils

    Publication Year: 1959, Page(s):465 - 468
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1222 KB)

    THIS PAPER applies the theory of heat flow to finding the steady-state temperature in excess of the surrounding iron. The ribbon coils may be either copper or aluminum, and may be either two or four in number. The magnets considered are large magnets of circular cylindrical shape such as lifting magnets. View full abstract»

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  • Equivalent circuits for 3-phase 4-wire induction motors operating on nonsymmetrical systems

    Publication Year: 1959, Page(s):468 - 476
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2505 KB)

    CALCULATION METHODS for predicting the performance of 3-phase 4-wire induction motors operating on nonsymmetrical systems are not generally known. Equivalent circuits and calculation procedures for polyphase motors with floating neutral have been available for some time. View full abstract»

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  • Graphical analysis and synthesis of feedback control systems I ¿¿ Theory and analysis

    Publication Year: 1959, Page(s):476 - 487
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3259 KB)

    IN THE DESIGN of high-performance feedback control systems it is necessary to consider simultaneously both the frequency and the transient response. Several methods have been developed to this end.1,2 The method proposed in this paper also operates in terms of both frequency and time domains, but it still permits the entire process to be effected in the real domain, thus greatly simplifying the pr... View full abstract»

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  • Graphical analysis and synthesis of feedback control systems II ¿¿ Synthesis

    Publication Year: 1959, Page(s):487 - 496
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2688 KB)

    WITH THE USE OF the method presented in Part I,1 it is possible to develop several suitable procedures for the analysis and synthesis of feedback control systems. The purpose of all these procedures is to reduce the characteristic equation to a form where the unknown parameters would take part only in the co-ordinates of the working point M(a1, a0). It is thereby achieved that changes in the value... View full abstract»

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  • Graphical analysis and synthesis of feedback control systems III ¿¿ Sampled-data feedback control systems

    Publication Year: 1959, Page(s):497 - 503
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1938 KB)

    EXCEPT FOR some special methods, two main approaches are possible in the analysis of sampled-data feedback control systems: 1. Analysis in p plane, p being the complex variable of Laplace transformation;1 and 2. Analysis in z-plane, z being the complex variable of Z-transformation.2 View full abstract»

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  • Analog computer simulation of an aircraft parallel A-C generating system

    Publication Year: 1959, Page(s):503 - 509
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3688 KB)

    THE OBJECT of this paper is to present a formulation of the dynamics of complex aircraft electromechanical systems using analytical representations of components suitable for analog computation. The ability of the computer to predict system performance as well as to provide a means for system analysis and synthesis is demonstrated by correlating the results of equipment tests and computer simulati... View full abstract»

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  • Tramp-iron remover for a field forage harvester

    Publication Year: 1959, Page(s):509 - 511
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1071 KB)

    AN electronic tramp-iron remover for chopped hay in pneumatic conveyors has been previously described for application in fixed installations such as barns or feed-mills.1,2 When green chopped hay is fed, however, a field harvester is the only machine that handles the hay pneumatically. The tramp-iron remover can be adapted for use on a field harvester to make a self-contained unit that is in some ... View full abstract»

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  • Artificial cooling of livestock in hot climates

    Publication Year: 1959, Page(s):512 - 517
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (6220 KB)

    THE possibilities of artificially increasing the comfort, or, more correctly, the efficiency of use of feed by farm livestock, are great. The range of optimum temperatures for laying hens is 55 to 65 F (degrees Fahrenheit), for dairy cows 50 to 60 F, and for swine 65 to 75 F. Size and age of animal, sex, coat, etc., are all related to its ability to resist high or low temperatures. Adverse effects... View full abstract»

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  • A phase-plane approach to relay sampled-data feedback systems

    Publication Year: 1959, Page(s):517 - 524
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2297 KB)

    The phase plane is used to solve second-order sampled-data feedback systems which contain a relay and zero order hold circuit. The relay quantizes the signal applied to the linear part of the system and each quantization level gives rise to a corresponding set of trajectories in the phase plane. Between sampling instants the output moves along one of these trajectories; however, the error signal w... View full abstract»

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  • Residential heating: Electric versus gas or oil

    Publication Year: 1959, Page(s):524 - 529
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1935 KB)

    A QUERY more and more frequently made these days seeks advice on the use of electric energy as compared to the older conventional fuels for the heating of a new home. The dealer in each type of fuel will ardently argue for his product and often supply convincing evidence. While there is a great deal of information available on each type as used in different houses, a meaningful comparison is diffi... View full abstract»

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  • Effect of driving source impedance on motor performance

    Publication Year: 1959, Page(s):529 - 531
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (951 KB)

    TO DATE, little attention has been focused on the resulting over-all system performance due to the effect of driving-source impedance on servomotor characteristics. The torque ¿ speed characteristics of a motor, as furnished by the manufacturer, may be correctly used for calculating the motor transfer function only when the identical test conditions relating to the driving source impedance to bot... View full abstract»

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  • Motor-operated switch for space heating control

    Publication Year: 1959, Page(s):532 - 534
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2207 KB)

    Resistance load (electric heaters, incandescent lights, etc.) can be switched most satisfactorily by a relatively slow moving motor-operated type of switch. Noise, contact wear, and general maintenance are all less than with the ordinary type of magnetic contactor, which is designed for switching inductive loads. View full abstract»

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  • Complex-zero signal generator for rapid system testing

    Publication Year: 1959, Page(s):534 - 539
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4901 KB)

    The expanding use of pole-zero techniques in designing feedback control systems has made paramount a simple method for determining characteristic pole-zero locations of existing systems and components. As a step in this direction, a method is presented for determining characteristic pole locations of a system. Use is made of a signal from a ¿zero generator.¿ This signal is fed into the system to... View full abstract»

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  • Earth source heat pumps: Characteristics, design, and operation

    Publication Year: 1959, Page(s):540 - 551
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3019 KB)

    TWENTY YEARS AGO the programs of many engineering meetings included papers on air conditioning. Air conditioning was ¿billed¿ as the business which would pull the country out of the depression. Today the heat pump appears with almost equal frequency in the discussions of technical societies. The claims made for it are more realistic than were those for air conditioning. View full abstract»

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  • Determining actual power output and derating factor of electric motors that drive oil well pumping units

    Publication Year: 1959, Page(s):551 - 559
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3727 KB)

    ELECTRIC MOTORS that drive oil well pumping units cannot deliver an average horsepower output equal to name-plate rating without the effective or rms current exceeding rated current. Expressed another way, motors that drive pumping units must be derated if they are to operate without being thermally overloaded. A method is presented for determining the per cent of rated power output that electric ... View full abstract»

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  • Field testing of D-C air circuit breakers on a high-capacity system

    Publication Year: 1959, Page(s):559 - 563
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2526 KB)

    AN unusual opportunity for testing d-c air circuit breakers on a high-capacity system has been made possible with use of the mercury-arc rectifier system at Alcoa's Rockdale Works. The system had a preliminary short-circuit current calculation of 880,000 amperes but the actual available current was determined at the test point, located mid-way on the d-c bus, to be slightly over 400,000 amperes. T... View full abstract»

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  • Freight car tractive resistance measurements by Doppler radar

    Publication Year: 1959, Page(s):563 - 566
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1280 KB)

    MODERN classification yards permit an incoming freight train to be redistributed to tracks assigned to various destinations, with all measurements, computations, and speed control performed automatically. In such yards cars are uncoupled at the crest of a hill and then accelerate freely down a slope which is usually about 3%. This increase in speed separates the cars so that track switches may be ... View full abstract»

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  • A novel generating system for railroad cabooses

    Publication Year: 1959, Page(s):566 - 570
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4787 KB)

    FOR MANY YEARS only an insignificant fraction of the cabooses operating on America's railroads have utilized any form of electric power. Most cabooses have been heated by oil stoves and illuminated by kerosene lanterns. Signaling and communications have been carried out by means of written notes or hand signals. View full abstract»

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  • Characteristics of an electric resistance furnace load

    Publication Year: 1959, Page(s):570 - 572
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1815 KB)

    IN 1899 Dr. E. G. Acheson discovered that if he overheated silicon carbide, the silicon was volatilized out and pure carbon or graphite remained. Later tests showed that graphite could be manufactured by heating petroleum coke to a high temperature [2,600 C (degrees centigrade)]. View full abstract»

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  • Differential analyzer aids design of electrical utility automatic dispatching system

    Publication Year: 1959, Page(s):572 - 579
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5644 KB)

    THIS PAPER encompasses two important aspects of the 1957 symposium theme of ¿Computers in Control.¿ First, the General Electric Automatic Dispatching System1¿3 to be described includes analog computing loops which insure that the turbine generators within the utility system are loaded according to incremental cost theories, thus resulting in minimum fuel expenditures for the utility system. Sec... View full abstract»

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  • Motor field control of large D-C reversing mill motors

    Publication Year: 1959, Page(s):579 - 585
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3099 KB)

    This paper analyses the performance of the field-current regulator on a large d-c reversing mill drive. A study is made of the transfer functions associated with the shunt-field-controlled d-c motor. The results obtained from an analog computer study of the problem are discussed and a brief description of the analog setup used for the study is given in Appendix I. Particular attention is paid to t... View full abstract»

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  • Comparison of calculated and measured arc-back current in large power rectifier systems

    Publication Year: 1959, Page(s):585 - 589
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1339 KB)

    EVEN with the high degree of reliability which mercury-arc rectifiers possess today, there are still a few occasions when current is carried in the wrong direction in one of the rectifier tanks and hence an arc back is created. Since this arc-back current can rise to an abnormally high value in a few milliseconds, a means must be provided to limit and to cut off this abnormal current when an arc b... View full abstract»

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  • A dual-mode servomechanism utilizing saturation switching

    Publication Year: 1959, Page(s):590 - 595
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1600 KB)

    This paper discusses the theoretical analysis and experimental verification of a dual-mode quasi-linear servo-mechanism. After a brief review of the operation of the simple dual-mode servo system, the desirability of linear operation for small errors is pointed out. A method of producing a gradual transition from one mode of operation to the other and finally to nearly linear operation is investig... View full abstract»

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  • Static control in automatic warehousing

    Publication Year: 1959, Page(s):595 - 602
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5273 KB)

    THE virtual elimination of relay contacts from the highly repetitive functions required for automatic warehousing was made possible by the selection of static control elements, Westing-house Cypak,1,2,3 in place of conventional relays for an extensive mechanized carton-handling installation in the Chelsea Milling Company premix food plant at Chelsea, Mich. While the basic concept of the control ph... View full abstract»

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  • General synthesis procedure for computer control of single-loop and multiloop linear systems (an optimal sampling system)

    Publication Year: 1959, Page(s):602 - 609
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2371 KB)

    This paper is concerned with the problem of designing optimal systems for the control of a plant governed by a linear differential equation with constant coefficients. Control is exerted by means of piecewise constant signals which can change only at the ¿sampling instants.¿ Optimality means here, as in some nonlinear problems, that the system achieves equilibrium with zero steady-state error fr... 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