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Electric Power Applications, IEE Proceedings B

Issue 6 • Date November 1988

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Displaying Results 1 - 23 of 23
  • Method of detecting and modelling presence of shorted turns in DC field winding of cylindrical rotor synchronous machines using two airgap search coils

    Publication Year: 1988, Page(s):281 - 294
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1462 KB)

    A method is described for detecting the loss of one or more turns in a concentric coil of the rotor field winding of a synchronous machine using two search coils in the airgap. This back-to-back method yields an EMF proportional to the rate of change of the `missing¿ flux linking the search coils, and is sufficiently sensitive for the coils to be positioned close to the stator surface. A two-dime... View full abstract»

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  • Coupling of discharge currents between conductors of electrical machines owing to laminated steel core

    Publication Year: 1988, Page(s):295 - 307
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1454 KB)

    Over the past few years, a number of techniques have evolved for detecting discharges in the insulation systems of electrical machines by measuring the discharge currents flowing at the machine terminals. The propagation of these currents through the winding, from the discharge site to the terminals, is influenced by the capacitive and inductive coupling between the conductors of the winding. The ... View full abstract»

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  • Stability limits for dynamic operation of variable reluctance stepping motor systems

    Publication Year: 1988, Page(s):308 - 317
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1021 KB)

    Using the simplified approach to the dynamic modelling of a variable reluctance step ping motor system developed in a companion paper [1], this paper develops dimensionless pull out torque curves and stability limits. These curves can be used to optimise system performance and allow the effects of variations in system parameters to be appreciated. View full abstract»

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  • Performance of split-coil switched reluctance drive

    Publication Year: 1988, Page(s):318 - 323
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (626 KB)

    The concept of a split coil switched reluctance motor (SSWR) drive is introduced. This motor results from the separation of the phase coils of a conventional switched reluctance motor (SWR) into two halves. Excitation requirements for the SSWR motor are met by providing one half of the phase winding with a DC current, the other half being connected to a bipolar drive stage. Experimental results in... View full abstract»

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  • New improved modulation method for a cycloconvertor driving an induction motor

    Publication Year: 1988, Page(s):324 - 333
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1449 KB)

    This paper describes new modulation techniques that remove all the major limitations of the noncirculating current cycloconvertor, including low maximum frequency, subharmonics, poor bank crossover timing, and distortion due to discontinuous current, when used to drive an induction motor. The new modulation techniques work by keeping the flux in the induction motor (sensed by voltage feedback) as ... View full abstract»

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  • Physical significance of sub-subtransient quantities in dynamic behaviour of synchronous machines

    Publication Year: 1988, Page(s):334 - 340
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (727 KB)

    The recent accurate modelling of alternating-current machines sometimes requires, in addition to the known transient and sub-transient quantities, the use of sub-subtransient quantities. The sub-subtransient time constants are very small; they can, however, have a great influence on the machine performance. The physical meaning of these new sub-subtransient quantities for the stability and switch-... View full abstract»

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  • Characteristics and optimal design of variable airgap linear force motors

    Publication Year: 1988, Page(s):341 - 345
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (562 KB)

    An analytical model for predicting the characteristics of variable airgap linear force motors is developed. The model takes into account magnetic losses, including the leakage and fringing effects, and the reluctance existing at the contacts between permanent magnets and polepieces. The model is validated by comparing its predicted characteristics with the results obtained from experiments and a f... View full abstract»

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  • Flat-top windows for PWM waveform processing via DFT

    Publication Year: 1988, Page(s):346 - 361
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1694 KB)

    New flat-top windows by which per forming the measurement of the parameters that characterise periodic signals are presented. It is shown how, by applying these windows in the frequency domain beyond the FFT, the negative effects of both the spectral leakage and the harmonic interference are reduced without employing interpolation algorithms. The high accuracy of the results is confirmed by an err... View full abstract»

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  • Erratum: Scalar control: an alternative AC drive philosophy

    Publication Year: 1988
    IEEE is not the copyright holder of this material | PDF file iconPDF (39 KB)
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  • 3-phase voltage sourced reversible rectifier

    Publication Year: 1988, Page(s):362 - 370
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1166 KB)

    A voltage sourced reversible rectifier (VSRR) which achieves bidirectional power flow between a 3-phase AC supply and a DC bus voltage is described. The device features a pulse width modulated voltage control strategy that confines unwanted harmonics to known frequency bands where they can be easily filtered out while operating at near unity power factor, with sinusoidal currents, and maintaining ... View full abstract»

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  • Influence of rotor currents on end-winding forces in cage motor

    Publication Year: 1988, Page(s):371 - 379
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (953 KB)

    The paper proposes a simple model that enables the influence of rotor currents to be included in the calculation of the electromagnetic forces acting on the end windings of cage induction motors, using the Biot¿Savart method. The inclusion of the rotor currents is shown to have greatest influence close to core, where the end-region fields are also highest. The validity of the model is established... View full abstract»

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  • Review of recent progress in linear motors

    Publication Year: 1988, Page(s):380 - 416
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (5168 KB)

    The paper gives a review of recent progress in linear electrical machines. The use of linear machines for industrial purposes is described and this is followed by a report of their application to transport propulsion and levitation. The development of linear forms of induction motor, synchronous motor, stepper motors, DC motors, permanent magnet motors and reluctance motors is described. A descrip... View full abstract»

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  • Review of recent progress in linear motors

    Publication Year: 1988, Page(s):380 - 416
    Cited by:  Papers (15)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (4012 KB)

    The author gives a review of recent progress in linear electrical machines. The use of linear machines for industrial purposes is described and this is followed by a report of their application to transport propulsion and levitation. The development of linear forms of induction motor, synchronous motor, stepper motors, DC motors, permanent magnet motors and reluctance motors is described. A descri... View full abstract»

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  • Performance of split-coil switched reluctance drive

    Publication Year: 1988, Page(s):318 - 323
    Cited by:  Papers (7)  |  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (424 KB)

    The concept of a split coil switched reluctance motor (SSWR) drive is introduced. This motor results from the separation of the phase coils of a conventional switched reluctance motor (SWR) into two halves. Excitation requirements for the SSWR motor are met by providing one half of the phase winding with a DC current, the other half being connected to a bipolar drive stage. Experimental results in... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Influence of rotor currents on end-winding forces in cage motor

    Publication Year: 1988, Page(s):371 - 379
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (656 KB)

    The authors propose a simple model that enables the influence of rotor currents to be included in the calculation of the electromagnetic forces acting on the end windings of cage induction motors, using the Biot-Savart method. The inclusion of the rotor currents is shown to have greatest influence close to core, where the end-region fields are also highest. The validity of the model is established... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Flat-top windows for PWM waveform processing via DFT

    Publication Year: 1988, Page(s):346 - 361
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1160 KB)

    New flat-top windows for accurate measurement of the parameters that characterise periodic signals are presented. It is shown how, by applying these windows in the frequency domain beyond the FFT, the negative effects of both the spectral leakage and the harmonic interference are reduced without employing interpolation algorithms. The high accuracy of the results is confirmed by an error analysis.... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Characteristics and optimal design of variable airgap linear force motors

    Publication Year: 1988, Page(s):341 - 345
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (384 KB)

    An analytical model for predicting the characteristics of variable airgap linear force motors is developed. The model takes into account magnetic losses including the leakage and fringing effects and the reluctance existing at the contacts between permanent magnets and pole pieces. The model is validated by comparing its predicted characteristics with the results obtained from experiments and a fi... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Stability limits for dynamic operation of variable reluctance stepping motor systems

    Publication Year: 1988, Page(s):308 - 317
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (696 KB)

    Using a simplified approach to the dynamic modelling of a variable reluctance stepping motor system, this paper develops dimensionless pull out torque curves and stability limits. These curves can be used to optimise system performance and allow the effects of variations in system parameters to be appreciated View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • 3-phase voltage sourced reversible rectifier

    Publication Year: 1988, Page(s):362 - 370
    Cited by:  Papers (12)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (724 KB)

    A voltage sourced reversible rectifier (VSRR) which achieves bidirectional power flow between a 3-phase AC supply and a DC bus voltage is described. The device features a pulse width modulated voltage control strategy that confines unwanted harmonics to known frequency bands where they can be easily filtered out while operating at near unity power factor, with sinusoidal currents, and maintaining ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • New improved modulation method for a cycloconvertor driving an induction motor

    Publication Year: 1988, Page(s):324 - 333
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (848 KB)

    The authors describe new modulation techniques that remove all the major limitations of the noncirculating current cycloconvertor, including low maximum frequency, subharmonics, poor bank crossover timing, and distortion due to discontinuous current, when used to drive an induction motor. The new modulation techniques work by keeping the flux in the induction motor (sensed by voltage feedback) as ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Physical significance of sub-subtransient quantities in dynamic behaviour of synchronous machines

    Publication Year: 1988, Page(s):334 - 340
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (492 KB)

    The recent accurate modelling of alternating-current machines sometimes requires, in addition to the known transient and sub-transient quantities, the use of sub-subtransient quantities. The sub-subtransient time constants are very small; they can, however, have a great influence on the machine performance. The physical meaning of these new sub-subtransient quantities for the stability and switch-... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Coupling of discharge currents between conductors of electrical machines owing to laminated steel core

    Publication Year: 1988, Page(s):295 - 307
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (996 KB)

    Over the past few years, a number of techniques have evolved for detecting discharges in the insulation systems of electrical machines by measuring the discharge currents flowing at the machine terminals. The propagation of these currents through the winding, from the discharge site to the terminals, is influenced by the capacitive and inductive coupling between the conductors of the winding. The ... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Method of detecting and modelling presence of shorted turns in DC field winding of cylindrical rotor synchronous machines using two airgap search coils

    Publication Year: 1988, Page(s):281 - 294
    Cited by:  Papers (7)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (992 KB)

    A method is described for detecting the loss of one or more turns in a concentric coil of the rotor field winding of a synchronous machine using two search coils in the airgap. This back-to-back method yields an EMF proportional to the rate of change of the `missing' flux linking the search coils, and is sufficiently sensitive for the coils to be positioned close to the stator surface. A two-dimen... View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.