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Power Apparatus and Systems, IEEE Transactions on

Issue 11 • Date Nov. 1965

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Displaying Results 1 - 15 of 15
  • Auxiliary Phase Design for Capacitor Start Motors

    Publication Year: 1965 , Page(s): 993 - 999
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1314 KB)  

    A procedure is described for calculation of an auxiliary phase for a single-phase capacitor start motor. The size of wire, the number of turns, and the size of capacitor are determined to meet five restraints. These restraints are: required locked rotor torque, maximum allowable capacitor volts, maximum allowable locked rotor current, greatest current density in the auxiliary winding, and largest slot fullness that is permitted. A trial winding is calculated using estimated number of turns, a trial wire size, and a trial capacitor. The characteristic impedances are determined as a function of winding ratio, wire size, and capacitor size. For each wire size and capacitor, an auxiliary winding is determined which will meet the restraints if it is possible. The method is arranged to facilitate digital computer programming. The logical flow is such that the program will arrive at the best auxiliary or determine that no satisfactory design exists. View full abstract»

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  • An Equivalent Circuit for a Single-Phase Motor Having Space Harmonics in its Magnetic Field

    Publication Year: 1965 , Page(s): 999 - 1007
    Cited by:  Papers (13)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1459 KB)  

    The equivalent circuit used for most single-phase motors with two windings is expanded to include motors having higher harmonics in the magnetic field, produced by concentric stator windings concentrated into stator slots. The mutual fields are described in equation form; how they occur in a single-phase induction motor is explained by a graphical interpretation. View full abstract»

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  • Impulse Levels of Large High-Voltage Generators

    Publication Year: 1965 , Page(s): 1007 - 1011
    Cited by:  Papers (4)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1090 KB)  

    The impulse level of high-voltage generator windings is reviewed with respect to the solid dielectric and gas spacing. Insulation differences between conventional and conductor-cooled generators are presented, industry application concepts are reveiwed, and proposals are made for a dc test that will assure a desired impulse strength level for generator windings. View full abstract»

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  • Inverter Rotor Drive of an Induction Motor

    Publication Year: 1965 , Page(s): 1011 - 1016
    Cited by:  Papers (8)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1579 KB)  

    A method for speed control of a wound-rotor induction motor is described. The rotor is supplied from an inverter, with SCRs having the same output frequency as the rotor (sf1). The stator is connected to a 3-phase network with constant voltage and frequency. The motor works in the region s > 1, so that the rotor revolves against the rotating field. The inverter works at a higher frequency than that of the network. Part of the slip power is fed back to the network. With mechanical and inverter-power limitations, the device permits continuous speed control from zero to maximum allowable speed. Starting is smooth and the starting current is low. Feedback may be used for speed stabilization under variable load. The motor is noiseless in spite of harmonics. View full abstract»

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  • Optimized Parameter Analysis of an Induction Machine

    Publication Year: 1965 , Page(s): 1017 - 1024
    Cited by:  Papers (9)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1452 KB)  

    Parameter optimization of an induction machine is discussed from the viewpoints of the consumer and the national economy. The parameters thus determined ensure minimum cost but not normal machine properties. The object of the analysis was to determine the direction of change of the normal parameters which would ensure reduction in cost. Optimization was effected on seven principal parameters with calculations carried out on a digital computer. The optimized machine obtained has an extremely small inner stator diameter and length of laminated core, excessive stator slot and yoke depths, a large rotor slot section, and a very high air gap induction. Calculation results yielded the breakdown of the annual cost of the machine which consisted of material and loss expenditures. View full abstract»

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  • Simulation of Unsymmetrical 2-Phase Induction Machines

    Publication Year: 1965 , Page(s): 1025 - 1037
    Cited by:  Papers (30)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2602 KB)  

    The equations which describe the dynamic performance of unsymmetrical 2-phase induction machines are established, and an analog computer representation is developed from these equations. Computer representations of several single-phase machines including the split-phase, the capacitor-start, and the capacitor-start-capacitor-run types of induction motors are developed by extension and modification of the unsymmetrical 2-phase machine representation. In these simulations, provisions are made for stator switching during the starting period. The results of a computer study which demonstrates the free-acceleration characteristics of the capacitor-start, as well as those of the capacitor-start-capacitor-run single-phase induction motors, are given. Computer results which show the decay of the open-circuit terminal voltage and the instantaneous torque during an opening and reclosing of the main winding are also included. View full abstract»

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  • Simulation of Symmetrical Induction Machinery

    Publication Year: 1965 , Page(s): 1038 - 1053
    Cited by:  Papers (197)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2163 KB)  

    The effectiveness of an analog computer in studying the performance of induction machinery is demonstrated with computer results which show the dynamic behavior of 2-phase and 3-phase machines during balanced and unbalanced operation. The computer simulation for these various modes of operation is conveniently obtained from the equations which describe the symmetrical induction machine in an arbitrary reference frame. Of particular interest is the representation which is used to simulate the opening and closing of a stator phase. This simulation would be useful in studying the performance of the induction machine when used in conjunction with electronic switching devices. The examples which are given can be used directly, or in a slightly modified form, to study various practical problems. Also, these examples should serve as guideposts in selecting the best reference frame or the best combination of reference frames to be used in the computer simulation of systems which have more than one machine. View full abstract»

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  • Unbalanced Operations of AC Machines

    Publication Year: 1965 , Page(s): 1054 - 1066
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2105 KB)  

    In this paper, unbalanced operations of induction and synchronous machines are discussed. The current-voltage differential equations, referred to the moving reference axes ¿ and ß, are derived directly from the general equations of armature reaction and induced voltage. Kron's tensor transformation is used to develop a reciprocal system representing the actual machine under unbalanced operations. As an illustration, the line-to-line short-circuit case of a synchronous machine is solved in detail. An approximate solution for the differential equation with variable coefficients is proposed. View full abstract»

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  • AC Power Generation with Transverse-Current Magnetohydrodynamic Conduction Machines

    Publication Year: 1965 , Page(s): 1066 - 1072
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1484 KB)  

    A 1-dimensional incompressible fluid model is used to show how two identical transverse-current MHD conduction generators, capable of self-excitation as dc generators, can be cross coupled magnetically to form a balanced 2-phase ac generator. The criterion for successful ac self-excitation is essentially the same as for successful dc self excitation; all reactive power is supplied by the generator magnetic-field energy storages, and the maximum operating frequency is limited by fluid conductivity and flow velocity. Conditions obtainable with seeded combustion gases yield frequencies too low for practical applications; however, conditions predicted for gases with nonequilibrium conductivity indicate the possibility of generating power at useful frequencies. View full abstract»

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  • Direct Measurement of Generator Winding Temperature Using a Miniature Transmitter

    Publication Year: 1965 , Page(s): 1073 - 1080
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (5559 KB)  

    The direct measurement of stator winding copper temperatures in large electric machines is made possible with a miniature tunnel diode oscillator, mounted directly on the current-carrying conductor. A temperature-sensitive capacitor in the oscillator's resonant circuit causes the radiated signal frequency to change as copper temperature changes. This signal, radiated through the thickness of the winding ground insulation, reaches an antenna external to the ground insulation. Then this signal is compared with one from a calibrated external oscillator, using a standard AM (amplitude modulated) radio circuit which will indicate changes in transmitted frequency. Calibration curves of frequency vs. temperature will reveal the copper temperature at the transmitter. View full abstract»

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  • Analysis of Induction Machines in Dynamic Systems

    Publication Year: 1965 , Page(s): 1080 - 1088
    Cited by:  Papers (17)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3325 KB)  

    Modern controlled semiconductors and their use in inverters and cycloconverters have resulted in the frequent application of induction machines in variable speed drive systems. Consequently, a need has arisen to develop simulation techniques for studying induction machines as components in controlled drives. An analog computer simulation together with its associated 2-phase voltage generator is described. The complete system is responsive to a single dc input signal which controls both speed and direction of rotation of the motor by controlling its frequency, voltage, and phase sequence. Regulators, timing circuits, and other actual system components are easily introduced into the control loop of the simulation. Typical results of the study of a position controlled induction motor drive are given. View full abstract»

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  • Induction Cup Parameters from Electromagnetic Field Theory and Experimental Analysis

    Publication Year: 1965 , Page(s): 1089 - 1093
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (790 KB)  

    Electromagnetic field theory and an experimental analysis are used to determine the parameters of induction cup machines. Equations for the rotor resistance, rotor self inductance, and stator to rotor mutual inductance are given in terms of machine geometry. Rotor end effects are also considered. A new test procedure is introduced to determine the ratio of rotor reactance to resistance and the ratio of the square of the mutual inductance to rotor self-inductance. This procedure, as well as existing test methods, is used to substantiate, experimentally, the theory. View full abstract»

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  • Test Analysis for Equivalent Circuit Parameters of Precision Induction Motors

    Publication Year: 1965 , Page(s): 1094 - 1103
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1317 KB)  

    The equivalent circuit of the induction motor has been modified by placing the iron loss resistance branch between r1 and x1 instead of in parallel with xM. By use of this circuit, the open circuit and stalled rotor tests are analyzed for the circuit parameters. The method given shows an improvement in obtaining X independently of r2 and in obtaining r2 itself. These improvements allow successful analyses at higher values of (r2/s)/X02 than previously. An improved method is shown for cases when x1 ¿ x2. It is shown that the relationship (X01 - Q) - P is significant in determining whether (r2/s)/X02 is above or below 1.00. A useful validity check on the test results is given. An alternate approximate method is given for cases of high values of (r2/s)/X02. A calculation sheet or test analysis format is given. View full abstract»

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  • Correction [to "Simulated service aging tests of insulating oils in transformers"] (Correspondence)

    Publication Year: 1965 , Page(s): 1104
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (906 KB)  

    Summary form only given, as follows. H.A. Adler, co-author with M.F. Cosgrove of the paper "Simulated Service Aging Tests of Insulating Oils in Transformers," which appeared on pp. 657-666 of the August 1965 issue of these Transactions, has advised the Editor of the following corrections: In the first full paragraph on p. 659, "1.2 percent of the annual oil volume" should read "1.2 percent per year of the oil volume." The third line of Table I under E should read "0.20," instead of "0.05," and the third line under F should read "0.14," instead of "0.02." In the last paragraph on p. 661 (third line from the bottom), th e word "and" should be inserted between " 1951" and "about." In the first line of Table III, the "Sludge, percent" should read "0.014," instead of "0.14." The last sentence of Conclusion 4 should read "This difference in oxidation stability can be important for sealed or conservator transformers when the oil is accidentally exposed to oxygen." View full abstract»

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  • Contributors

    Publication Year: 1965 , Page(s): 1104 - 1106
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    Freely Available from IEEE

Aims & Scope

This Transactions ceased production in 1985. The current retitled publication is IEEE Transactions on Energy Conversion and IEEE Transactions on Power Delivery, and IEEE Transactions on Power Systems.

Full Aims & Scope