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Includes the top 50 most frequently accessed documents for this publication according to the usage statistics for the month of

  • Universal type motors

    Publication Year: 1925, Page(s):1319 - 1323
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1924 KB)

    Heretofore the subject of universal motors has not received very much publicity but the field for these motors has been increasing so rapidly that a great deal more attention is now being given to them. The paper endeavors to bring out points of general interest rather than going into the fundamental design and other details. The term “universal” as applied to this type of motor is d... View full abstract»

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  • Abridgment of two-reaction theory of synchronous machines generalized method of analysis — Part I

    Publication Year: 1929, Page(s): 194
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (234 KB)

    STARTING with the basic assumption of no saturation or hysteresis, and with distribution of armature phase m. m. f. effectively sinusoidal so far as regards phenomena dependent upon rotor position, general formulas are developed for current, voltage, power, and torque under steady and transient load conditions. Special detailed formulas are also developed which permit the determination of current ... View full abstract»

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  • Appendix

    Publication Year: 1926, Page(s):669 - 670
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    Derivation of formula (d). View full abstract»

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  • Transmission stability: Analytical discussion of some factors entering into the problem

    Publication Year: 1925, Page(s):951 - 961
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2583 KB)

    The subject of stability has been much discussed lately, because it has an important bearing on future large power developments. In the early stages of a large program, such as the proposed superpower program, good engineering and common-sense dictate that each step should be very carefully considered from all points of view, since a blunder or failure to give proper weight to some important facto... View full abstract»

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  • Synchronous machines I — An extension of Blondel's two-reaction theory

    Publication Year: 1926, Page(s):974 - 987
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3390 KB)

    Blondel treated salient pole machines by resolving the fundamental space component of m. m. f. along the two axes of symmetry the direct axis of the pole, and the quadrature axis between poles. Using this idea and applying harmonic analysis, Blondevs theory has been extended in the present paper to a comprehensive system of treatment in which the effect of harmonic m. m. fsy as well as the fundame... View full abstract»

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  • Abridgment of the reactances of synchronous machines

    Publication Year: 1928, Page(s):345 - 348
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1271 KB)

    Until somewhat recently, synchronous machine theory has been satisfied with a relatively few characteristic constants, or reactances, in terms of which the behavior of machines has been calculated. Present theory, however, requires many more coefficients. There are now generally recognized two values each of leakage, synchronous, and transient reactance, which correspond to the two symmetrical axe... View full abstract»

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  • Steady-state stability in transmission systems calculation by means of equivalent circuits or circle diagrams

    Publication Year: 1926, Page(s):365 - 373
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1809 KB)

    The maximum load on a proposed transmission system must be within the steady-state power limit of the system for stability of operation. Two methods of calculating steady state stability are given in detail and illustrated by examples. (1) The given transmission system is replaced by a simple equivalent system, then the steady-state power limit of this equivalent system is determined graphically. ... View full abstract»

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  • Abridgment of the calculation of the armature reactance of synchronous machines

    Publication Year: 1928, Page(s):265 - 269
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1446 KB)

    This paper presents new and simplified formulas for the armature leakage reactance of synchronous machines, and compares the results obtained with tests on 100 machines of varied types. The new formulas are characterized by novel expressions for the end leakage and for the “air-gap” or “differential leakage” reactances. Formulas for zero phase-sequence reactances also a... View full abstract»

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  • Application of electric propulsion to double-ended ferry-boats

    Publication Year: 1925, Page(s):1077 - 1082
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1386 KB)

    The double-ended ferry-boat propelled by means of a bow and stern propeller has become the recognized standard type, due to its maneuvering possibilities and general handiness in congested harbors. In all cases in which the prime mover is directly coupled to the two propeller shafts which must necessarily turn at the same revolutions per minute, the over-all propulsive efficiency is lowered due to... View full abstract»

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  • Light and architecture

    Publication Year: 1929, Page(s):561 - 562
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2974 KB)

    It is quite natural for new schools of thought in design, decoration, and architecture to originate in continental Europe. The atmosphere, background, and tradition of the larger cities are all conducive to this end. Within the last half century, or even since the beginning of the 20th century, our very habits of living have undergone remarkable changes. The mechanical element in the production of... View full abstract»

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  • Mechanical force between electric circuits

    Publication Year: 1926, Page(s):231 - 235
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (932 KB)

    A general equation is developed for the mechanical force exerted by a system of n electric circuits, upon any part of that system. The electric circuits are assumed to contain resistances, and the reluctance of the several magnetic circuits is assumed to be a function of both the currents and the relative positions of the circuits. The equation is therefore applicable to circuits involving saturat... View full abstract»

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  • Cipher printing telegraph systems: For secret wire and radio telegraphic communications

    Publication Year: 1926, Page(s):109 - 115
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2691 KB)

    This paper describes a printing telegraph cipher system developed during the World War for the use of the Signal Corps, U. S. Army. This system is so designed that the messages are in secret form from the time they leave the sender until they are deciphered automatically at the office of the addressee. If copied while en route, the messages cannot be deciphered by an enemy, even though he has full... View full abstract»

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  • Proposed standard tests of broadcast radio receivers

    Publication Year: 1930, Page(s):802 - 803
    Request permission for commercial reuse | PDF file iconPDF (536 KB)
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  • Super synchronous motor

    Publication Year: 1924, Page(s): 193
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (563 KB)

    The name “super synchronous” has been given to a certain type of motor, not because the motor operates above synchronous speed but because it has the ability to develop super torque in starting. There has been a demand for a long time for some type of synchronous motor that would develop during the starting cycle a torque as great or greater than that of an induction motor of the wou... View full abstract»

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  • Power limitations of transmission systems

    Publication Year: 1924, Page(s):45 - 51
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1560 KB)

    Review of the Subject — Several independent studies have been made recently to determine the economies of a large, uniform power system. The two studies of more general interest were those conducted by the Department of the Interior, under the direction of W. S. Murray, for the Superpower Zone, and by F. G. Baum for the United States. Both of these investigations are available in published ... View full abstract»

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  • Current-limiting reactors their design, installation and operation

    Publication Year: 1924, Page(s):1142 - 1143
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (331 KB)

    The essential features in the design, installation and operation of current-limiting reactors are pointed out. The application of reactors to different circuits is not treated because a number of good papers dealing with this subject has been presented at Institute meetings. View full abstract»

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  • Theory of three circuit transformers

    Publication Year: 1924, Page(s):1208 - 1209
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (724 KB)

    P. L. Alger: Mr. Boyajian's theory of three-circuit transformers applies to the induction motor as well as to the transformer. His three-circuit transformer is the same in theory as the double-squirrel-cage induction motor, and the same phenomenon of a negative reactance which occurs in his diagrams also occurs in the equivalent circuit of the motor. View full abstract»

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  • The M. M. F. wave of polyphase windings: With special reference to sub-synchronous harmonics

    Publication Year: 1927, Page(s):118 - 127
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1753 KB)

    The m. m. f. waves of fractional slot windings or other irregular windings are found to contain harmonic components having wavelengths greater than two pole pitches. These are designated as sub-synchronous harmonics since their harmonic order is lower than that of the synchronously rotating wave. They induce currents in the damper windings of synchronous machines which may produce noticeable loss.... View full abstract»

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  • Decibel - The name for the transmission unit

    Publication Year: 1929, Page(s): 223
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (273 KB)

    In 1923 the “mile of standard cable” was replaced in the Bell System by a new unit for expressing telephone transmission efficiencies and levels. At that time, the generic term “transmission unit” was taken to designate this new unit, since it was considered desirable to defer the adoption of a more distinctive name until this unit had been given further consideration b... View full abstract»

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  • Abridgment of parallel operation of transformers: Whose ratios of transformation are unequal

    Publication Year: 1929, Page(s):809 - 812
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (951 KB)

    An equation is developed for use in meeting emergency conditions which necessitate the paralleling of transformer banks whose impedances expressed in percentage are not equal. This equation makes it possible to calculate what change should be made in the ratio of transformation of the bank with the lower percentage impedance in order to prevent its being overloaded when the total load approaches t... View full abstract»

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  • Theory of three-circuit transformers

    Publication Year: 1924, Page(s):345 - 355
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2262 KB)

    The characteristics of three-circuit transformers, the literature of which is very meager, is discussed here in considerable detail. The features of the scheme of treatment are as follows: 1. The scope and general aspects of the problems of three-circuit transformers are reviewed. 2. Some peculiar phenomena of considerable theoretical interest are cited. 3. An electrical network equivalent to the ... View full abstract»

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  • Abridgment of electrical equipment of bar plate and hot strip mills

    Publication Year: 1929, Page(s):353 - 356
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2773 KB)

    The paper describes the electrical features of a continuous bar plate and hot strip mill recently placed in service at Middletown, Ohio, including information regarding the general layout of the plant, the electrical circuits, rolling mills, the various motor drives, control arrangements, the motor-generator sets for supplying d-c. motors, and the safety devices. It also gives test data on the pow... View full abstract»

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  • High-voltage measurements on cables and insulators

    Publication Year: 1927, Page(s):963 - 964
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (522 KB)

    W. B. Kouwenhoven: I am very glad that Mr. Kasson has pointed out again the necessity of using shields and guards in making high-voltage measurements on cables. I pointed out at the Mid-Winter Convention of 1926 that unless shields and guards are employed the results may be widely in error. View full abstract»

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  • Recent improvements in large induction motors

    Publication Year: 1927, Page(s):1167 - 1175
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (5019 KB)

    Like that of many other rotating electrical machines, the development of the large induction motor has been a steady and an interesting progression. From the first induction motor to the present product has been a long step, marked by the analytical ability of many capable engineers, and accompanied by continual improvements in construction, some of which are reviewed in this paper. To describe th... View full abstract»

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  • Abridgment of magnetic leakage and fringing flux calculations

    Publication Year: 1928, Page(s):340 - 344
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1069 KB)

    The object of this paper is the development of an empirical method of determining leakage and fringing fluxes in an electromagnetic system. Certain assumptions are made; namely, (a) the reluctance of the iron parts of the magnetic circuit are negligible as compared with that of the air-gaps; (b) the leakage and fringing components of the flux follow paths of convenient geometric shape. Formulas ar... View full abstract»

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  • Abridgment of certain topics in telegraph transmission theory

    Publication Year: 1928, Page(s):214 - 217
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1066 KB)

    The most obvious method for determining the distortion of telegraph signals is to calculate the transients of the telegraph system. This method has been treated by various writers, and solutions are available for telegraph lines with simple terminal conditions. It is well known that the extension of the same methods to more complicated terminal conditions, which represent the usual terminal appara... View full abstract»

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  • Squirrel-cage induction-motor core losses

    Publication Year: 1925, Page(s):32 - 37
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1262 KB)

    An experimental method is presented for segregating the various no-load losses of a squirrel-cage induction motor. It is shown that for insulated rotor bars the losses consist principally of stator fundamental-frequency losses, rotor surface losses and eddy-current losses in the rotor bars due to radial and tangential slot-leakage fluxes in the rotor slots caused by reluctance pulsations in the ai... View full abstract»

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  • Effects of time and frequency on insulation test of transformers

    Publication Year: 1924, Page(s):145 - 155
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2589 KB)

    Permanently grounded transformers must be given the insulation lest by inducing the necessary voltage across the windings. The A. I. E. E. Standards specify that the time of induced voltage tests be the same as for high potential test. In certain cases where the transformers are of very large capacity the induced voltage must be made at a frequency several times higher than normal. Since the diele... View full abstract»

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  • Abridgment of standards of insulation and protection for transformers

    Publication Year: 1930, Page(s):570 - 573
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1350 KB)

    This paper presents the reasons and evidence which have influenced the authors to favor the proposed recommendations on relation of transformer insulation to adjacent line insulation set forth in a companion paper by Messrs. Montsinger and Dann. The paper first outlines the principal considerations which govern the determination of transmission line insulation on one hand, and transformer insulati... View full abstract»

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  • Abridgment of high-speed circuit breakers

    Publication Year: 1928, Page(s):702 - 705
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1251 KB)

    High-speed circuit breakers have been successfully applied to d-c. railway systems for a number of years, but designs suitable for application on 12,000-volt single-phase systems have not been available until recently. A description of an air circuit breaker design suitable for 12,000-volt applications and having a speed of operation comparable with the d-c. type has been included. The method of a... View full abstract»

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  • Abridgment of extinction of an A-C. arc

    Publication Year: 1928, Page(s):706 - 710
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1389 KB)

    The transition from high conductivity to high resistivity which an a-c. arc undergoes on extinction is studied. Theory and approximate calculations are given for the rate of recovery of dielectric strength of the arc space for short arcs, and results are given of experiments on short arcs, and arcs in holes and slots in insulating material and insulating plates. The influence of chemical activity ... View full abstract»

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  • Calculation of the capacitance between two wires of a three-conductor cable

    Publication Year: 1928, Page(s): 760
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (465 KB)

    This paper develops a formula for calculating the capacitance between two wires of a three-conductor cable. A direct method of calculation is employed, based on the work of Doctor H. B. Dwight. This method gives accurate results independent of empirical or restricted premises. View full abstract»

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  • Single-phase motor-torque pulsations

    Publication Year: 1924, Page(s): 1142
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (172 KB)

    This article gives results of a study of the vibrations of small single-phase induction motors, with a view to determining their causes and eliminating the noise which they produce. The possible sources of such vibrations were analyzed, and an experimental study was made in which the principal cause was definitely determined to be the double-frequency variation of the electro-magnetic torque devel... View full abstract»

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  • Lightning: Does lightning oscillate? As a first approximation, what is the voltage, current, resistance, energy, power, damping, potential gradient, and rate-of-change of current?

    Publication Year: 1924, Page(s):1144 - 1145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (318 KB)

    By the use of some new experimental data of the resistance of conducting vapors the conclusion is reached that the current in a streak of lightning oscillates. Starting with experimental value of 4500 volts per centimeter, as the average potential gradient for the electrostatic field between the thunder-cloud and earth, some astonishingly high values for the factors involved in lightning resulted.... View full abstract»

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  • Multiple system of cooling large turbo generators and an experimental study of ventilation of turbo-alternators

    Publication Year: 1924, Page(s):1202 - 1206
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1547 KB)

    S. L. Henderson: The papers of Mr. Fechheimer and Mr. Bratt are of primary interest to the designer; particularly to those designers of large machines which require more than the usual air gap entrance for the admission of cooling air. To others, the papers will indicate the amount of research work which is being carried on to enable the manufacturer to build larger and better machines. To the des... View full abstract»

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  • Radio uses of piezo-electric crystals

    Publication Year: 1925, Page(s): 1290
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (300 KB)

    Piezo-electricity is a phenomenon which has been known for many years but which is having some remarkable new applications. Certain crystals undergo a slight expansion or contraction when an electrical voltage is applied to them and, vice versa, produce a slight voltage when compressed or pulled. A piece of quartz crystal 1 or 2 inches long has a high natural frequency of the same order as the fre... View full abstract»

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  • Present status of the international electrical units

    Publication Year: 1927, Page(s):769 - 775
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1727 KB)

    This paper summarizes the present legal standing and practical usage of the international electrical units, particularly us maintained in the United States. The international agreement reached in 1910 was provisional and requires some revision. Further investigations of the international standards, as well as of the absolute units, are urgently needed to put the system on a satisfactory basis for ... View full abstract»

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  • Studies of transmission stability

    Publication Year: 1926, Page(s):374 - 383
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2329 KB)

    Stability may be defined as the capacity of a power system to remain in equilibrium under steady load conditions, and its ability to regain a state of equilibrium after a disturbance has taken place. The lack of stability first manifested itself in the cases of overloaded machines and high impedance tie lines. The transmission of large blocks of power over long distances has presented the problem ... View full abstract»

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  • Starting characteristics and control of polyphase squirrel-gage induction motors

    Publication Year: 1926, Page(s):153 - 159
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1906 KB)

    In the application of squirrel-cage induction motors to such severe service as frequent start and stop or frequent plugging operation, it is desirable to know how much loss the motor will be required to dissipate. Plugging being understood as changing the motor from any speed in one direction to any speed in the opposite direction, by reversing the rotation of the field only. The subject of starti... View full abstract»

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  • Automatic substations for industrial plants

    Publication Year: 1924, Page(s):411 - 415
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4873 KB)

    Industrial enterprises have been the last to lake advantage of the developments in automatic station equipment. As an aid to the engineers responsible for these establishments, the author has described the principal types of electric-power transforming equipment to which automatic switching has been applied. The automatic control of synchronous condensers, synchronous motor-generators, synchronous... View full abstract»

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  • Adjustment of automobile headlights

    Publication Year: 1924, Page(s): 464
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (276 KB)

    An interesting feature of the recent Chicago Motor Show was an exhibit showing how headlights ought to be adjusted. This booth was arrangedby the Bureau of Standards in cooperation with the Society of Automotive Engineers and the Chicago Motor Club. An automatic projection machine was employed to give further instruction. Pamphlets prepared by the Bureauand printed by the National Automobile Chamb... View full abstract»

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  • The comparison of natural and artificial lighting

    Publication Year: 1926, Page(s): 230
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (303 KB)

    In connection with the efforts that are now being made to trace the relation between better lighting and higher efficiency of work, it is natural that experimenters should try to base their conclusions on the results achieved by daylight. View full abstract»

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  • Relationship between physics and electrical engineering

    Publication Year: 1927, Page(s):107 - 108
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (592 KB)

    The usual understanding of the relationship between electrophysics and electrical engineering is that physicists discover facts and laws, develop methods of measurement, determine various constants, propose and work out in detail mathematical theories and hypotheses, etc., while electrical engineers later apply some of these valuable facts and theories to the design, construction, and operation of... View full abstract»

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  • Abridgment of the revolving field theory of the capacitor motor

    Publication Year: 1929, Page(s):190 - 194
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (937 KB)

    The paper presents an accurate theory of the split-phase motor, both as regards starting and running performance. The general equations for an unbalanced two-phase motor are first derived, and the results are then applied to the special case of the capacitor motor. Evidence of the validity of the theory is given in the form of curves, comparing test results with calculations. The principal factors... View full abstract»

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  • Operating transformers by temperature

    Publication Year: 1930, Page(s):3 - 6
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1004 KB)

    This paper discusses a proposal, sponsored by the Transformer Subcommittee of the Committee on Electrical Machinery, which is intended to serve as a guide in operating transformers by temperature rather than in accordance with their nameplate ratings. There is a real difference between “rating standards” and “recommendations for operation;” one simply specifies the meas... View full abstract»

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  • Corona investigation on an artificial line

    Publication Year: 1925, Page(s):813 - 820
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3310 KB)

    Accompanying corona on a transmission line, there has been found, in several cases, an appreciable increase in the line charging current over that indicated by the usual formula. This has been taken to indicate an increased line capacitance resulting from the presence of the corona envelope about the conductors, and has, for this reason, come to be described as the extra-capacity effect of corona.... View full abstract»

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  • A carrier-current pilot system of transmission line protection

    Publication Year: 1927, Page(s):1015 - 1021
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3307 KB)

    The increasing complexity of modern transmission networks presents many difficult problems in connection with the design and application of protective relays. View full abstract»

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  • Ground relay protection for transmission systems

    Publication Year: 1927, Page(s):1089 - 1094
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2527 KB)

    The relay problems of an electric power system are most important, and are very vital to the successful operation of the system. More and more consideration is being given to the relay engineers' point of view with resultant improvement in system operation. Several large, successful companies undertake no project having any bearing on the primary electric system without due regard to the relay eng... View full abstract»

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  • The electrical resistivity of insulating materials

    Publication Year: 1927, Page(s):1095 - 1103
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2153 KB)

    A brief review is given of the literature on conduction through insulators. Every dielectric has a definite resistivity when the potential gradient is below a certain value, different for each substance. If the potential gradient is continually increased, a point is reached where an increase in voltage does not affect the current. This is called the saturation current. With still greater potential... View full abstract»

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  • Squirrel-cage induction-motor core losses

    Publication Year: 1925, Page(s):659 - 662
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1471 KB)

    P. L. Alder: Mr. Spooner's paper extends by one step our knowledge of those various kinds of core losses which we have been considering for several years in Institute papers. First, we described the line-frequency losses; then, recently, Mr. Spooner described the surface losses; and now the pulsation losses are being attacked. These last losses, though, are the most complicated and the most diffic... View full abstract»

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Aims & Scope

The Journal of the American Institute of Electrical Engineers (AIEE) contains articles published between 1924 and 1930. Contents are devoted to the advancement of theory and practice of electrical engineering and the allied arts and sciences.

This Journal ceased publication in 1930. The current retitled publication is IEEE Spectrum.

Full Aims & Scope