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EPE Journal Volume 12-4 - Papers
- High Power Densities with Three Dimensional Integration
- Integrated Design Approach for Medium Power Inverters Optimized for EMC and Thermal Performance
- A New Line Harmonic Reduction Technique for Single-Phase Single-Stage Converter Using Parallel Power Processing
- A Harmonic Elimination Scheme for an Open-End Winding Induction Motor Drive Fed from Two Inverters Using Asymmetrical DC Link Voltages
- Motion Control Taking Environmental Information into Account
- Measured Performances of a New Hybrid Excitation Synchronous Machine
EPE Journal Volume 12-4 - Editorial
By B. Sneyers
The Editorial of the EPE Journal Volume 12 N°4, written by Ir. Brigitte Sneyers, the Secretary General of EPE Association
EPE Journal Volume 12-4 - Papers
By J.A. Ferreira
A trend exists towards higher power densities in power electronic, driven by the applications market and new technologies.The hybrid integration of semiconductor devices represents the first level of power electronic integration. At higher levels passive components will be included in the same package and eventually complete power electronic converters could be integrated. This calls not only for more compact three dimensional packaging techniques but electromagnetic integration of the passive circuit functions and integrated heat management of all the circuit components. In the paper various issues for achieving high power densities and higher levels of integration are discussed including geometrical packaging, electromagnetic and thermal issues. Some practical examples will also be presented ad case studies.
By M. Chiadň Caponet; F. Profumo
Today's state of the art power electronics systems require the design engineers to employ an integrated approach, utilizing IGBTs, heat sink, capacitors and gate driver circuits at their peak performance. While functionality is of course always important, the problem of manufacturability, cost and electromagnetic compatibility (EMC) are elements that have to be kept into account. In this paper the authors show how electromagnetic interference caused by power electronic circuits can be reduced by the minimization of the total inductance commutation loop of an inverter leg. At the same time special attention is due to the compactness of the inverter especially as regard to the heat sink and the thermal issues. The goal is a proper design and construction of the inverter so tackling EMI directly at the source where most EMI is generated. In this way application of expensive EMI filters can be avoided. Moreover the analysis of thermal behaviour is shown. In order to reach this goal a proper selection and design of the inverter parts have been made and implemented. Specifically, a prototype of converter has been developed to reach the maximum reduction of the stray inductance commutation loop and the maximum compactness using the actual available technology. Experimental results are giver to show the validity of this approach.
By J-Y. Lee
A new line harmonic reduction technique for single-phase single-stage converter is proposed. Using parallel power processing, this converter shows low link voltage stress under wide line and load changes while providing a good power factor and efficiency. The experimental results show that the maximum link voltage stress and efficiency are about 447 V and 81%, respectivily. Experimental results show that the power factor is above 0.96 under the universla line condition at full load and the maximum link voltage stress is 385 V. The proposed converter is suitable for low cost and compact power supplies below several hundreds watts and universal line applications.
By K. K. Mohapatra; V. T. Somasekhar; K. Gopakumar
In this paper a low order harmonic elimination technique for an open-end winding induction motor drive is proposed. For the present open-end winding drive, the induction motor is fed from two 2-level inverters with different isolated d.c.-link voltages of ratio equal to 1:0.366. With such a scheme it is found that all the 5th and 7th order (6n +/- 1, where n = 1,3,5,7 etc.) harmonics are absent in the motor phase voltage. The third harmonic order currents are eliminated from the motor by using isolated d.c.-link supply for the two inverters. Once the 5th and 7th order harmonics are eliminated, the next higher order harmonics present in the motor phase voltages are 11th, 13th, 23th, 25th, etc. (6n +/- 1, n = 2, 4, 6 etc.). The proposed scheme is implemented for v/f contreol by using triangular carrier wave and appropriate modulating waves for each inverter. With the proposed modulating waves for each inverter a smooth transition to the over-modulation region is also achievable from the present open-end winding IM drive.
By M. Morisawa; K. Ohnishi
Much effort has been concentrated on the control of a single control of motion system. However, future machine or robots will be spread out in our society and they will make their motion in an open environment. Since such an environment has a lot of modes, a design methodology of motion controller to be adaptive to the environment is required. The paper shows a novel viewpoint to quarry the modes from environment. Two examples of an abstraction using Hadamard matrix are shown. One is a friction-free drive and the other is a control of paddle foot for walking machine. Modal transmission from environment to the final posture should change adaptively according to the ituation. There are numerical and experimental examples in the paper. They show the viabiity of novel approach to the compliant motion.
By Y. Amara; E. Hoang; M. Gabsi; M. Lecrivain; A.H. Ben Ahmed; S. Dérou
PM synchronous machines may operate over broad speed ranges at constant power thanks to the introduction of control laws, that enables flux weakening. Generally, this control is accomplished by applying a strong demagnetizing current in the d-axis; yet, such an approach engenders the risk of an irreversible magnet demagnetization and a reduction in machine performance. In this paper will be presented an original layout for the hybrid-excitation synchronous machine: an excitation by both magnets and coils. This solution allows for effective flux weakening while reducing the risk of magnet demagnetization. Attention is focused on the study of maximum power limits of these machines.