EPE Journal Volume 03-1 
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EPE Journal Volume 03-1 - Editorial
EPE Journal Volume 03-1 - Papers



 EPE Journal Volume 03-1 - Editorial 

Dedication  [Details]
By G. Maggetto

The Editorial of the EPE Journal Volume 3 N1, "Dedication", written by Prof. Gaston Maggetto, the Past-President of EPE Association.


 EPE Journal Volume 03-1 - Papers 

Microelectronics, the Driving Force in the Development of Electrical Drives  [Details]
By R. Gabriel

From several sides microelectronics has a great influence on the development of electrical drives. The one is the control side which goes digital more and more - not forgetting the analog part of sensing - the second is power electronics, which has not been a real microelectronics area since the MOS Power Transistors and more recently IGBT technology influenced this development. We are just at the beginning of this development which will lead to new High Power Smart Devices, the integration of complex digital control in single ship systems and the integration of mechanics and microelectronics. This paper will explain some new developments in power electronics, a new High Voltage Smart Power technology and recent developments in the integration of digital control by means of ASICs.

On the Performance of Optimal Pulsewidth Modulation Techniques  [Details]
By J. Holtz

A variety of different optimal pulsewidth modulation techniques have emerged from recent research. Among these are the real-time optimization techniques, the synchronous off-line optimized modulation, and the trajectory tracking method. The paper evaluates their respective performance under comparable operating conditions. It is concluded that considerable reduction of harmonic distortion can be achieved in the modulation range above m = 0.6 at switching frequencies below 500 Hz. The benefit reduces with reducing modulation index. Below m = 0.2, optimal and non-optimal methods show little differences.

Parallel Processing for Vector Control of Induction Motors: Implementation and Review  [Details]
By G. M. Asher; M. Sumner

This paper addresses the current state of microprocessor implementation for high performance AC Induction Motor Control. In view of the innate parallelism of motor drive control functions, the implementation using the Transputer parallel processor is described. This processor is used as a basis for comparison with other leading processors, both in terms of performance and flexibility and convenience in implementation. The philosophy of parallelism is illustrated through the implementation of a standard rotor-flux oriented control system with attendant communications and on-line rotor time constant tuning. The paper gives a brief comparate review of a number of rotor time constant methods in respect of performance and implementation.

An Overview of Soft-Switching Techniques for PWM Converters  [Details]
By G. Hua; F. C. Y. Lee

Recently, a number of soft-switching pulse-width-modulated (PWM) converter techniques have been proposed, aimed at combining the desirable features of both the conventional PWM and the resonant converters while avoiding their respective limitations. In this paper, four classes of soft-switching PWM converters are reviewed, including the zero-voltage-switched (ZVS) quasi-square-wave converters (QSCs), ZVS-PWM converters, zero-current-switched (ZCS) PWM converters, and zero-voltage-transition (ZVT) PWM converters; their merits and limitations are assessed. Experimental results of several prototype of converters are presented to illustrate each class of converters.

Wide Bandwidth Rogowski Current Transducers: Part I - The Rogowski Coil  [Details]
By W. F. Ray; R. M. Davis

This paper is the first of two parts giving a comprehensive examination of the use of Rogowski coils for wide bandwidth current waveform measurement. Rogowski coils have previously been used for special applications of current measurement such as very short duration high current pulses, but have only recently become available as general purpose transducers suitable for power electronic equipment. This requires a bandwidth of 50 Hz to at least 1 MHz for performance comparable to a standard co-axial shunt.

Part I examines the coil behaviour and its implication for the integrator design in terms of sensitivity, drift, noise and bandwidth. It is shown, contrary to previous pronouncements, that the coils screen is not advantageous and that improved bandwidth may be obtained by situating the integrating resistor in the coil assembly. Some practical measurements are provided.

Part II will examine integrator behaviour and the overall transducer performance.

Part II of this paper can be found in EPE Journal Volume 1993-2.