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IEE Proceedings B - Electric Power Applications

Issue 6 • Date Nov. 1989

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Displaying Results 1 - 7 of 7
  • Specification of an overvoltage damping filter for the National Railways of Zimbabwe

    Publication Year: 1989, Page(s):249 - 256
    Cited by:  Papers (17)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (799 KB)

    The authors describe the design and testing of an overvoltage damping filter supplied to the National Railways of Zimbabwe. The mechanism of overvoltage generation is explained, along with the need to limit overvoltage amplitude. An explanation of the choice of filter to reduce overvoltage is given, and the techniques used to derive the filter-component values and rating are described. A frequency... View full abstract»

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  • Class E low dv/sub D//dt rectifier

    Publication Year: 1989, Page(s):257 - 262
    Cited by:  Papers (5)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (510 KB)

    The author presents a new Class E low dv/sub D//dt rectifier, its analysis and experimental results. The rectifier circuit contains a capacitor connected in parallel with a rectifying diode. The capacitor sets the conduction angle of the diode current, and the output-filter capacitor independently sets the AC ripple on the DC output voltage. The diode-junction capacitance is included in the parall... View full abstract»

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  • Cage induction motors with inter-rings

    Publication Year: 1989, Page(s):263 - 274
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (944 KB)

    A general form of analysis is described that is capable of modelling cage induction machines with inter-rings (conducting rings joining all the bars of the cage, positioned along the length of the rotor stack). The model is verified using a commercially-manufactured motor. It is shown that, as far as torque is concerned, inter-rings have an effect which is opposite to that introduced by skewing th... View full abstract»

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  • Field computation of permanent magnets with knee points

    Publication Year: 1989, Page(s):275 - 280
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (407 KB)

    Since the demagnetisation curves of permanent magnets with knee points are not single-valued, hysteresis effects below the knee points need to be considered. A field problem with an unknown and nonuniform permanent-magnet source distribution occurs. A hysteresis model for simulating permanent magnets with such knee points is presented. By using the model and a permanent-magnet source-iteration met... View full abstract»

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  • Analysis and simulation of static Kramer drive under steady-state conditions

    Publication Year: 1989, Page(s):281 - 292
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (910 KB)

    A rigorous analysis of the static Kramer drive under steady-state conditions is described in which stator variables are transformed on to a frame of reference which is stationary with respect to the rotor. For constant-speed operation the system equations are reduced to a set of linear differential equations with constant coefficients which are solved to predict drive waveforms, allowing for inver... View full abstract»

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  • New cycloconvertor with static induction transistors

    Publication Year: 1989, Page(s):293 - 298
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (568 KB)

    The authors present a new type of cycloconvertor that is based on the static induction transistor (SIT). They also present a new control method, which we develop by using a pulsewidth-modulation (PWM) technique. The control algorithm is extremely simple in this method, enabling microprocessor-based control. A prototype six-pulse cycloconvertor is controlled by a small-scale controller based on TMS... View full abstract»

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  • Multicriterial optimisation of squirrel-cage induction motor design

    Publication Year: 1989, Page(s):299 - 307
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (997 KB)

    The task of finding an optimal induction-motor design is defined as a discrete multicriterial optimisation problem. An approach to solving this problem through two-level optimisation is described. A bicriterial problem is solved by the assumption that all optimisation variables are continuous. Criterial functions in the example are material and operating costs of the motor. The possibility of appl... View full abstract»

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