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Electrical Engineers, Proceedings of the Institution of

Issue 7 • July 1970

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Displaying Results 1 - 25 of 48
  • A.C. performance of f.e.t. analogue switch

    Publication Year: 1970, Page(s):1205 - 1210
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (708 KB)

    The a.c. performance of a series f.e.t. analogue switch is investigated, and it is shown that this choice of switch is not always ideal; since, in the `off¿ state, signal feedthrough occurs, while, in the `on¿ state, turnoff of the device can occur past a critical frequency (i.e. frequency pinchoff). Signal feedthrough is easily reduced to negligible proportions by using shunt/series switching; ... View full abstract»

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  • Sequential-state binary parallel adder

    Publication Year: 1970, Page(s):1211 - 1218
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (840 KB)

    The process of binary addition is examined in the context of the construction of a large parallel digital computer, in which it is desired to perform fixed-point additions as rapidly as possible using current i.c. technology. The block-carry adder is shown to be the fastest method of addition previously available. Two addition algorithms are then presented, both of which involve the sum register i... View full abstract»

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  • Influence of high-level languages on computer design

    Publication Year: 1970, Page(s):1219 - 1224
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (913 KB)

    The paper discusses the influence of high-level languages on the form of instructions, codes, the representation of data and the storage structure of new computer designs. In particular, some of the similarities of and differences between the Burroughs B6500 and the new Manchester University design are discussed. It is concluded that these machines will significantly speed the throughput of progra... View full abstract»

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  • Detailed analysis of 3rd-harmonic tuning of television horizontal-deflection circuit

    Publication Year: 1970, Page(s):1225 - 1230
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (693 KB)

    A detailed mathematical analysis of the operation of the television horizontal-deflection circuit is carried out. The amount of oscillatory ringing in the scanning process is expressed by functions of the components in a lossless equivalent circuit. The fault in the customarily presumed 2.8th-harmonic tuning method is clearly shown with examples, where the ringing oscillations are supposed to be s... View full abstract»

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  • Discussion on "Radar echoes from clear air in relation to refractive-index variations in the troposphere"

    Publication Year: 1970, Page(s):1230 - 1231
    IEEE is not the copyright holder of this material | PDF file iconPDF (289 KB)
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  • Pencil-beam synthesis for large circular arrays

    Publication Year: 1970, Page(s):1232 - 1234
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    A method is developed which permits the synthesis of a pencil beam for a circular array with an arbitrary number of directive elements. A desired pattern specified in the azimuth and elevation directions is approximated in the least-mean-square-error sense, and the synthesis procedure, which requires the inversion of a matrix, is made quite straightforward. When the total number of array elements ... View full abstract»

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  • Frequency and bandwidth of H plane TEM junction circulator

    Publication Year: 1970, Page(s):1235 - 1238
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (320 KB)

    The H plane stripline circulator consists of a ferrite disc in contact with air or some other dielectric on either side of the TEM line. The purpose of the paper is to give some experimental results which have been obtained with such a device. These results include the bandwidth and operating frequency of the device as a function of the ferrite filling factor. An approximate theory of the device i... View full abstract»

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  • Multiparameter sensitivity indexes of performance for linear time-invariant networks

    Publication Year: 1970, Page(s):1239 - 1247
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (973 KB)

    A multiparameter sensitivity index of performance is defined for linear time-invariant networks, and is used to investigate the sensitivity performance of lowpass LC ladder filters. A procedure is outlined for determining, for a given filter, an `optimum tolerance set¿ which ensures that the various element changes contribute equally to the total change in the filter performance. A `2-level¿ opt... View full abstract»

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  • Discussion on terminal units and transmission in electronic telephone exchanges

    Publication Year: 1970
    IEEE is not the copyright holder of this material | PDF file iconPDF (174 KB)
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  • Effects of slot skew and iron saturation on cogging torques in induction machines

    Publication Year: 1970, Page(s):1249 - 1252
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (376 KB)

    The vast majority of induction motors have skewed slots, and one of the principal reasons for employing skew is to reduce the cogging tendency. It is shown that skewing can effectively achieve this purpose, and a simple equation is given which describes the effect on these torques. However, the precise amount of skew can be important, and one has to weigh the advantages against such disadvantages ... View full abstract»

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  • Discussion on 'Application of linear indiction motors to high-speed transport systems'

    Publication Year: 1970, Page(s):1253 - 1256
    IEEE is not the copyright holder of this material | PDF file iconPDF (662 KB)
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  • Design synthesis of double-cage induction motors

    Publication Year: 1970, Page(s):1257 - 1263
    Cited by:  Papers (9)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (838 KB)

    The paper presents a method for synthetising the equivalent-circuit parameters of double-cage induction motors to attain specified levels of starting, accelerating, breakdown torque and running performance. New equations are derived, avoiding certain approximations which have commonly been made hitherto, and these equations are used to relate the equivalent-circuit parameters to the motor performa... View full abstract»

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  • A.C. multimotor drive maintaining selected speed ratios at all speeds within well defined limits

    Publication Year: 1970, Page(s):1264 - 1268
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (877 KB)

    It is usual for manufacturers of drives for processing machines to supply individual regulatable drive motors equipped with electronic speed-control systems. These control systems are unable to control the motors within closely defined speed limits, especially during erratic load conditions. The paper, however, describes a system of drive motors in the well known synchronous-tie connection which t... View full abstract»

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  • Improving commutation in d.c. machines by the use of flux traps

    Publication Year: 1970, Page(s):1269 - 1276
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1289 KB)

    It is suggested that sparking in a d.c. machine may be reduced by incorporating thin sheets of copper (`flux traps¿) to arrest the rapid changes of flux, at the end of the commutation period, that induce the high e.m.f.s that cause the sparking. The sheets need only be thin (typically 0.01 in) since they are intended to be effective only for the short periods (up to 10 ¿s) when sparking would ot... View full abstract»

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  • Self-cascaded machine: a low-speed motor or high-frequency brushless alternator

    Publication Year: 1970, Page(s):1277 - 1290
    Cited by:  Papers (103)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1800 KB)

    The self-cascaded machine is a single-unit version of two separate induction machines connected in cascade. In construction, however, it closely resembles a conventional induction motor. It may be run asynchronously, with resistance control if required, or synchronously without any external connections to the rotor winding. As a motor it is particularly suited to low-speed duties. With its simple ... View full abstract»

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  • Commutation phenomena in electrical machines. Part 3: Experiments using the commutator of a production machine

    Publication Year: 1970, Page(s):1291 - 1297
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (904 KB)

    In earlier parts of the paper, it was established with laboratory turntable rigs that a major mechanism of `flashover¿ involved the generation of a series of intersegmental arcs, and the indluence of various parameters on their generation and behaviour was studied. In the present work, similar experiments have been carried out on the cylindrical commutator of aproduction machine. It has been foun... View full abstract»

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  • Discussion on "Saturated leakage reactances of cage induction motors"

    Publication Year: 1970, Page(s):1298 - 1299
    IEEE is not the copyright holder of this material | PDF file iconPDF (335 KB)
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  • Discussion on 'Insulation for high-voltage a.c. railway electrification in Great Britain'

    Publication Year: 1970, Page(s):1300 - 1301
    IEEE is not the copyright holder of this material | PDF file iconPDF (410 KB)
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  • Discussion on "Some aspects of electrical machines with open magnetic circuits"

    Publication Year: 1970, Page(s):1301 - 1302
    IEEE is not the copyright holder of this material | PDF file iconPDF (356 KB)
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  • Magnetic skin effects in medium-frequency machines

    Publication Year: 1970, Page(s):1303 - 1308
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (691 KB)

    In a previous paper, a new theory of medium-fequency generators was expounded, by which it is possible to determine the complete characteristics (including peak) of these machines, a problem which had not hitherto been solved. The paper completes this theory by analysing the magnetic skin effect in laminas and showing that this effect leads, in certain cases, to a considerable decrease in the peak... View full abstract»

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  • New approach to micromachine construction

    Publication Year: 1970, Page(s):1309 - 1316
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1097 KB)

    Although digital computers may be used to study power systems, there is still scope for the employment of model systems; and in these, the most difficult items to model are the alternators, because the mechanical and electrical parameters must both be scaled correctly. Much has been written on modelling, and it is clear that the apparently attractive technique of exact geometric scaling is unaccep... View full abstract»

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  • Solution of linear steady-state eddy-current problems by complex successive overrelaxation

    Publication Year: 1970, Page(s):1317 - 1323
    Cited by:  Papers (4)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (767 KB)

    The paper considers two topics which arise in the application of the finite-difference successive-overrelaxation method to problems involving eddy currents induced in nonmagnetic conductors by magnetic fields varying sinusoidally with time. First, a simple 1-dimensional problem is used to determine a criterion governing the mesh length between adjacent nodes in the grid covering a conducting regio... View full abstract»

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  • Commutation transients in h.v.d.c. convertors during normal and abnormal conditions

    Publication Year: 1970, Page(s):1324 - 1332
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (839 KB)

    The paper describes a computer program for the determination of the various current and voltage oscillations encountered in h.v.d.c. convertors as a consequence of commutation discontinuities. Commutation oscillations during different types of convertor faults are calculated and compared with those occurring during normal operation. View full abstract»

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  • Generalised principle of operation of 3-phase thyristor invertor

    Publication Year: 1970, Page(s):1333 - 1336
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    The paper explains the principle of operation of a 3-phase invertor by means of vector diagrams Commutation at fixed and variable frequencies is discussed, as well as improving the commutation by the use of diodes. View full abstract»

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  • Statistics of circuit-breaker performance

    Publication Year: 1970, Page(s):1337 - 1345
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1390 KB)

    A wide range of data is presented which shows that the electrical performance of high-voltage a.c. circuit breakers is statistical. The electrical performance cannot be characteristed by a single stress level such as a rated stress; a stress ratio is also required to specify the spread of operating conditions over which both clearances and failures occur fairly often. Present test specifications a... View full abstract»

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Aims & Scope

The Proceedings of the Institution of Electrical Engineers was published by the IET between 1963 and 1979.

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