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IEE Proceedings B - Electric Power Applications

Issue 2 • Date March 1980

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Displaying Results 1 - 9 of 9
  • Measurements of the influence of core geometry, eddy currents and permeability on the axial flux distribution in laminated steel cores

    Publication Year: 1980, Page(s):57 - 67
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (985 KB)

    Measurements are described of the axial flux distribution inside the laminated steel core of a slotless model machine. The measurements were made over a range of frequencies and coreplate permeabilities, and the model could accomodate cores of different radial depth both with and without an end screen and a steel rotor. The measurements show that the axial flux distribution can be considered as be... View full abstract»

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  • Three-phase pole-by-pole model of a linear induction machine

    Publication Year: 1980, Page(s):68 - 82
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1172 KB)

    This paper develops a stationary-reference-frame coupled circuit model for a 4-pole linear induction machine (l.i.m.), a model similar in nature to the abc-phase model used to predict conventional round-rotor machine behaviour. A comparison between model predictions and high-speed double-sided l.i.m. data shows that good predictions can be made using equivalent-circuit parameters calculated from m... View full abstract»

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  • Field analysis for rotating induction machines and its relationship to the equivalent-circuit method

    Publication Year: 1980, Page(s):83 - 90
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (841 KB)

    This paper presents a field analysis for rotating induction machines which includes the effects of rotor skew, and accurately models the discrete nature of the rotor curent. It is verified by comparison with the conventional equivalent-circuit method, and by using it to derive the equivalent-circuit for a balanced 3-phase skewed-rotor induction machine. View full abstract»

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  • Flux and speed numerical control of a voltage-fed asynchronous induction machine

    Publication Year: 1980, Page(s):91 - 95
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (480 KB)

    The authors present the study and the realisation of a stator flux's numerical regulation for a voltage-fed asynchionous machine. The stator flux is estimated by an observer that reconstitutes it from electrical variables measured on an experimental apparatus. The asynchronous machine works with its stator flux maintained constant during all the transient operating conditions; the electromagnetic ... View full abstract»

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  • Harmonics in multiple convertor systems: a generalised approach

    Publication Year: 1980
    Cited by:  Papers (46)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1116 KB)

    This paper describes a method which has been developed (and used) to calculate the harmonics associated with systems containing a large number of convertors and other sources of harmonics, e.g. steel mills or large h.v.d.c. convertor stations. The method used is a steady-state (frequency-domain) analysis in which each convertor can be individually described in detail. The effect of the a.c. system... View full abstract»

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  • Input characteristics of naturally commutated single-phase asymmetrical convertors

    Publication Year: 1980, Page(s):107 - 116
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1019 KB)

    Thyristor control is increasingly being used for voltage control on a.c.-supplied traction vehicles. Although such equipment improves the traction performance, it also introduces disturbances into lineside signaffing and telephone circuits. This paper defines the input characteristics of single-bridge and multibridge asymmetrical convertor circuits. Using the equations developed in this paper, the... View full abstract»

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  • Output voltages of a multiswitch inverter

    Publication Year: 1980, Page(s):117 - 119
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (282 KB)

    The well known 3-phase inverter incorporates three pairs of power switching devices. When the number of phases exceeds three, there is the possibility of obtaining a phase-balanced system from less switch pairs than the number of phases. With particular reference to multiphase machines, this paper examines the effect of switch-pair elimination on voltage balance and switch loading. Graphical metho... View full abstract»

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  • Operation of a lead/acid battery with thyristor chopper burden

    Publication Year: 1980, Page(s):120 - 123
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (539 KB)

    A battery of twelve 2 V cells was used to supply power to a carbon pile resistor, on steady discharge and on pulse discharge created by a thyristor chopper. For frequencies in the range 25¿487.8 Hz, at several mark-space ratios, with fixed low discharge rates, the ampere-hour performance on pulsed-discharge was identical to that on steady discharge. View full abstract»

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  • Approach to the design of applicators for radio-frequency drying

    Publication Year: 1980, Page(s):124 - 128
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (669 KB)

    The paper summarises the results of measurements made to determine the design criteria for building radio-frequency applicators for drying textile materials. The method of measuring the Q-factor is applied in this field in a unique manner and it is quite generally applicable to all r.f. applications. The results are described by useful empirical equations, one of which can readily be applied in de... View full abstract»

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