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IEE Proceedings B - Electric Power Applications

Issue 2 • Date March 1990

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Displaying Results 1 - 7 of 7
  • Compensating for dead time degradation of PWM inverter waveforms

    Publication Year: 1990, Page(s):73 - 81
    Cited by:  Papers (39)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (861 KB)

    The output voltage waveforms of a bridge inverter using some form of modulation strategy, such as pulse width modulation (PWM), are not the same as the ideal modulated waveforms because of the effect of 'dead time'. This is the short period of time that is allowed to elapse for safety reasons between switching one device in an inverter leg off and the other device on. Methods of compensating for d... View full abstract»

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  • Circuit analysis of a power pulse generator for electrostatic precipitators

    Publication Year: 1990, Page(s):83 - 88
    Cited by:  Papers (1)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (514 KB)

    The operation of a circuit developed for the pulse energising of electrostatic precipitators (ESP) is investigated. The circuit is part of a system consisting of a DC LV power supply, the pulse generator proper, a pulse transformer, a DC HV power supply and the electrostatic precipitator. The electrical characteristics of the precipitator vary with the changing characteristics of the fluid (dust, ... View full abstract»

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  • Mixed pole windings and some applications

    Publication Year: 1990, Page(s):89 - 97
    Cited by:  Papers (14)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (885 KB)

    When two polyphase AC windings of differing pole number are housed in a common AC machine stator, their separate MMFs combine additively in some regions of the machine and subtractively in others. The flux pattern consists of two components of short wavelength and small flux per pole, while the pattern of radial force between stator and rotor contains a component of long wavelength. This feature i... View full abstract»

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  • Compliant-core reluctance machines

    Publication Year: 1990, Page(s):99 - 110
    Cited by:  Papers (6)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1153 KB)

    The author describes a novel type of electrical machine in which one member deforms under the influence of the magnetic forces acting upon it. The concept is an electromagnetic derivative of the mechanical strain-wave form of gearing used in robot and other critical applications. An initial analysis of one form of the device has been carried out and indicates the potential to develop very high tor... View full abstract»

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  • Inverter drive signal processing via DFT and EKF

    Publication Year: 1990, Page(s):111 - 119
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (852 KB)

    Two algorithms for estimating both the positive sequence fundamental symmetrical component and the frequency of the voltage system at the terminals of an inverter-fed three-phase motor are presented. The first one is based on the discrete Fourier transform (DFT) of the instantaneous symmetrical component of the positive sequence and yields off-line estimates. The accuracy is improved by the applic... View full abstract»

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  • Superconducting synchronous induction motor performance

    Publication Year: 1990, Page(s):120 - 124
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (535 KB)

    A method is presented for determining the steady state running currents, torques, speeds, power factors and efficiencies of a superconducting synchronous/induction motor. Also, a method is presented for determining the current and magnetic flux densities that a superconductor must be able to withstand to successfully function in a superconducting synchronous/induction motor. The methods are applie... View full abstract»

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  • Parallel operation of bridge rectifiers without an interbridge reactor

    Publication Year: 1990, Page(s):125 - 140
    Cited by:  Papers (6)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1230 KB)

    Parallel connection of rectifier circuits is needed for very high direct-current supplies such as those for electrochemical plant. Appropriate phase displacement of their AC supply voltages is used to increase the pulse number, and an interrectifier reactor, often known as an interphase transformer (IPT), is connected on the DC side to prevent circulating AC components between the rectifiers and t... View full abstract»

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