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IEE Proceedings B (Electric Power Applications)

Volume 129, Issue 6, November 1982

Volumes & issues:

Volume 129, Issue 6

November 1982

Transient performance of inverter systems
  • Author(s): S.R. Bowes ; J. Clare ; R.R. Clements
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 301 –314
  • DOI:  10.1049/ip-b.1982.0043
  • Type: Article
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  • p. 301 –314 (14)
    This report describes an investigation into the feasibility of using computer-modelling techniques for evaluating the transient performance of inverters. A computer-analysis package has been developed which can be used to model and investigate various aspects of the design and performance of power-electronic equipment. The feasibility of using this computer package for evaluating the transient performance of inverters has been demonstrated using a commercial static frequency changer (SFC). It is concluded that the results of this study have confirmed the validity and accuracy of the computer-modelling techniques used, and that these techniques can now be used to predict the performance of future inverter designs.
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Inverter regulation by transformer tap changing
Simulation of a transformer/rectifier unit for aircraft power-supply systems
  • Author(s): J.G. Kettleborough ; I.R. Smith ; B.A. Fanthome
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 323 –329
  • DOI:  10.1049/ip-b.1982.0045
  • Type: Article
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  • p. 323 –329 (7)
    A mathematical model for the type of transformer/rectifier unit used in aircraft power-supply systems is described. The model is suitable for investigating both the effects of variations in the transformer parameters on the unit performance and the interaction of the unit with other items of plant in the supply system. The experimental unit on which the model was validated exhibits a marked imbalance between the two diode bridges fed from the transformer secondary windings, and this is satisfactorily predicted by the model. Introducing even a moderate harmonic content into the supply voltage to the transfer increases considerably the imbalance, which under full-load conditions could result in overloading and possible failure of the diodes of one of the bridges.
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A circuital method for the prediction of pull-out torque characteristics of hybrid stepping motors
Terminal behaviour of the uncontrolled R-L fed 3-phase bridge rectifier
  • Author(s): D.J. Tylavsky  and  F.C. Trutt
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 337 –343
  • DOI:  10.1049/ip-b.1982.0047
  • Type: Article
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  • p. 337 –343 (7)
    Equations are derived which describe the terminal behaviour of the uncontrolled resistance-inductance fed bridge convertor. Generalisation of these equations to the controlled case is accomplished by a substitution of variables. Boundaries within which the uncontrolled rectifier can operate are specified. Plots of the terminal characteristics for the uncontrolled case visually show the approximation involved when the resistive portion of the commutation impedance is neglected. Simple approximations are provided for the fundamental current component equations which are derived.
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Microprocessor-controlled separately excited DC-motor drive system
High reliability 3-phase variable-frequency inverter
Book review: Electromagnetic Levitation and Suspension Techniques
An alternative energisation mode for the 4-phase, variable-reluctance stepping motor
  • Author(s): A.P. Russell  and  I.E.D. Pickup
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 355 –358
  • DOI:  10.1049/ip-b.1982.0051
  • Type: Article
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  • p. 355 –358 (4)
    An energisation sequence is proposed which enables satisfactory static torque/angular position characteristics to be obtained with the 4-phase, single-stator, variable-reluctance (VR) stepping motor when operating in the halfstep mode. It is shown to be advantageous to utilise 3-phase excitation, where a substantial increase in holding torque is obtained when the distribution of magnetomotive force (MMF) among the phases is optimally proportioned, subject to the thermal constraint on the stator-winding losses. Experimental results are presented, and a simple analysis of the magnetic arrangement is developed.
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Protection methods for power-transistor circuits
  • Author(s): P.D. Evans  and  B.M. Saied
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 359 –363
  • DOI:  10.1049/ip-b.1982.0052
  • Type: Article
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  • p. 359 –363 (5)
    The paper proposes a number of protection methods which can be used with power transistors in power-control units. They give satisfactory protection against simultaneous conduction of the two devices in an inverter leg. The techniques, which are independent of the control electronics and base-drive circuits, are simple and reliable to implement. They include an instantaneous and electrically isolated method of fault indication, a fast-acting crowbar circuit and a means of diverting the current away from the power devices in the event of a fault.
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Analysis of end effects in a linear induction motor by the Wiener -Hopf technique
  • Author(s): K. Venkataratnam  and  T.P. Rao
  • Source: IEE Proceedings B (Electric Power Applications), Volume 129, Issue 6, p. 364 –372
  • DOI:  10.1049/ip-b.1982.0053
  • Type: Article
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  • p. 364 –372 (9)
    The paper presents a rigorous 2-dimensional analysis of a double-sided linear induction motor, with particular reference to the entry-end and the exit-end effects. The analysis takes into account the discontinuity of the stator winding as well as the discontinuity of the stator iron. The field equations, together with the boundary conditions, constitute a mixed boundary value problem, which is solved by the use of Wiener-Hopf technique (WHT). The results clearly bring out the individual effects of (i) the discontinuity in the winding and (ii) the discontinuity in the iron, as well as the 2-dimensional nature of the field quantities. The analysis is illustrated by applying it to the data of two linear induction motors.
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The manley-rowe relationships and parametric oscillatory motion in electro-mechanical devices
The manley-rowe relationships and parametric oscillatory motion in electromechanical devices

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