# Electrical Engineers, Proceedings of the Institution of

## Filter Results

Displaying Results 1 - 14 of 14
• ### Amplitude-controlled two-loop adaptive delta modulator

Publication Year: 1979, Page(s):285 - 290
Cited by:  Papers (2)
| |PDF (726 KB)

In this paper an adaptive delta modulator (a.d.m.) is proposed which derives its companding information from the number of transitions from 0 to 1 and 1 to 0 that occur in the digital output. The companding characteristics and the s.n.r. have been analysed. The details of an experimental coder built in the laboratory are given along with the performance. At 32 kbit/s, the s.n.r. for a 800 Hz signa... View full abstract»

• ### Voltage-fed operation of linear induction motors under conditions of supply unbalance

Publication Year: 1979, Page(s):293 - 297
Cited by:  Papers (2)
| |PDF (573 KB)

The inherent unbalance in a 3-phase linear induction motor (l.i.m.) operating under a voltage-fed mode is accentuated by end effects at high speeds. The voltage-fed operation is analysed by identifying the slip-dependent inductance coefficients corresponding to the positive- and negative-sequence components, and taking into account the stator resistance and leakage reactances. The approach takes c... View full abstract»

• ### Development of a stabilisation scheme for the suppression of parametric instability in stepping motors

Publication Year: 1979, Page(s):298 - 306
Cited by:  Papers (2)
| |PDF (1344 KB)

A scheme for stabilising the dynamic performance of a stepping motor is described. When the motor operates unstably, the velocity varies cyclically about the synchronous speed. A signal proportional to this velocity oscillation is used to frequency modulate the command pulses, which control the switching of the motor phases. Stable operation is achieved by suitable adjustment of the phase displace... View full abstract»

• ### Nonlinear model for predicting settling time and pull-in rate in hybrid stepping motors

Publication Year: 1979, Page(s):307 - 312
Cited by:  Papers (1)
| |PDF (828 KB)

The development of a model for predicting the dynamic response of hybrid permanent-magnet stepping motors from static flux-linkage data is described. The method involves the derivation of mathematical functions for the flux-linkage of the stator coils in terms of coil current and angular position of the rotor. A comparison of experimental and predicted responses for a typical medium-sized commerci... View full abstract»

• ### Vacuum arc under an axial magnetic field and its interrupting ability

Publication Year: 1979, Page(s):313 - 320
Cited by:  Papers (72)
| |PDF (1169 KB)

Characteristics of a vacuum arc under an axial magnetic field have been investigated. The confinement effect of the arc between the electrodes is clearly demonstrated. By this effect, it was found that the arc is significantly stabilised, and consequently the interrupting ability of the arc increases. A demonstration of the current interruption up to 200 kA r.m.s. is shown and the design philosoph... View full abstract»

• ### Probabilistic evaluation of transient stability in a multimachine power system

Publication Year: 1979, Page(s):321 - 326
Cited by:  Papers (9)
| |PDF (760 KB)

There has been continuous development of better techniques for assessing transient instability in a power system. It has also been recognised that there is a need for additional indices of transient stability which more completely reflect all the factors that influence system stability. The bulk of the work in this area is based on deterministic models. The probabilistic nature of the basic factor... View full abstract»

• ### Operational experience with fossil-fired generating plant under automatic load control

Publication Year: 1979, Page(s):327 - 332
| |PDF (790 KB)

Automatic load following by fossil-fired generating units requires the control of the flow of air and fuel to the boiler, and of the steam flow to the turbine. Prototype load controllers designed to achieve this have been installed at coal and oil-fired power stations within the CEGB. The principle behind their design is that boiler-stored energy is made available only for system frequency regulat... View full abstract»

• ### Conductor systems for overhead lines: some considerations in their selection

Publication Year: 1979, Page(s):333 - 341
| |PDF (1431 KB)

The selection of conductors for a modern overhead transmission or distribution system is an exercise in optimisation and balancing of conflicting requirements. Service experience and environmental considerations may often challenge established concepts for the design of future lines. The reasons for the predominance of aluminium-based conductors are outlined, and the wide available range of such c... View full abstract»

• ### Discussion on "Multiplexed controls on underground trains"

Publication Year: 1979, Page(s):342 - 343
| |PDF (405 KB)
• ### Modelling induction motors for computing transient behaviour

Publication Year: 1979, Page(s):343 - 344
Cited by:  Papers (1)
| |PDF (274 KB)
• ### Design of a class of wide-angle limited-rotation rotary actuators

Publication Year: 1979, Page(s):345 - 350
Cited by:  Papers (11)
| |PDF (718 KB)

Two design methods are presented for a doubly-excited, doubly-salient, concentrated-winding type of limited-rotation double-acting rotary actuator employing natural air cooling. The first is based on specified values of current density and magnetic flux density, and the second (a development of the first) uses experimental data relating winding temperatures to I2R losses. A synthesis procedure is ... View full abstract»

• ### The sixty-ninth Kelvin Lecture. Electrical technology and polymer science

Publication Year: 1979, Page(s):351 - 355
| |PDF (851 KB)

The polymer field has been the source of both elegant discoveries and highly useful inventions. It has responded to three main driving forces: first, the pushÂ¿ provided by fundamental discoveries in physics and chemistry; secondly, the pullÂ¿ provided by the needs of the electrical industry; and, thirdly, the `feedbackÂ¿ of electrical discoveries and inventions into the field of polymer chemist... View full abstract»

• ### Transport properties of mass-identified ions in oxygen, nitrogen, carbon dioxide and carbon monoxide

Publication Year: 1979, Page(s):356 - 360
| |PDF (568 KB)

The interpretation of electrical-discharge phenomena in gases requires detailed information about the transport properties of the ions and electrons involved and about the ion-molecule chemistry in which the ions participate. This paper is devoted to an account of a recent study of ion-transport properties, and in particular gives details of measurements of the lateral diffusion of mass-identified... View full abstract»

• ### Erratum: Design of stochastic optimal feedback control systems

Publication Year: 1979
| |PDF (65 KB)

## Aims & Scope

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

Full Aims & Scope