Preface
Selected papers, after final reviewing process, were presented at the XVI International Conference on Electrical Machines 2004 (ICEM’2004) which was held in Cracow, Poland on 5-8 September 2004.
The ICEM is the only major international conference devoted entirely to electrical machines. Started in London in 1974, ICEM is now established as a regular biennial event. Following the very successful conferences in Istanbul in 1998, Helsinki in 2000 and Belgium in 2002 ICEM’2004 was jointly organized by Institute of Mechatronics and Information Systems, Technical University of Lódz,Poland (main organizer) in cooperation with a few Polish universities and Polish Society of Applied Electromagnetics.
The Conference venue was Cracow. Historically, Cracow is Poland’s most distinguished city, on a par with the most famous places in Europe, comprising rich and varied cultural heritage. The ancient royal capital of Poland for centuries has been constituting cross-roads where influences of many traditions meet, namely traditions of the Italian, French, German, Austrian and Jewish cultures.
Cracow’s uniqueness made it one of the first places to be entered on the UNESCO World Cultural Heritage List in 1978. Alongside hundreds of wonderful monuments of architecture, you will see here exquisite collections of Polish,Western European, Jewish, Persian and Japanese art. Cracow is the city of Copernicus and Pope John Paul II, of Penderecki and Wajda. It is a city of churches and museums, theatres and festivals, scholarship and music, a city brimming with life and as ever the focus of Poland’s cultural and academic spirit.
The aim of the conference is to discuss recent developments of modeling and simulation methodologies, control systems, testing, measurements, monitoring and diagnostics, advanced software methodology, etc. applied in electrical drives. The meeting is intended to be a forum for applied mathematicians, computer and software engineers, and electrical engineers to exchange ideas, experience on the new developments, trends and applications from industrial and academic viewpoints on the topic. An important goal of ICEM is also stimulating personal contacts and co-operation, especially between industrial and academic institutions.
Almost 930 papers have been submitted as digests, and after reviewing process, in which two referees have reviewed each paper, 525 papers have been accepted for the presentation at the Conference. Over 430 papers in full versions, after final reviewing, have been published on CD as conference proceeding. The papers published in the conference proceeding were refereed by the sessions’ chairmen for further publication as post conference issue. It is the tradition of the ICEM meetings that they comprise quite a vast area of computational and applied problems. Moreover, the ICEM conferences aim at joining theory and practice, thus the majority of papers are deeply rooted in engineering problems, being simultaneously of high theoretical level. A knowledge of physical phenomena is necessary for understanding the operation of electromagnetic devices, electromechanical converters and electronic systems in general, such as sensors, actuators, solid-state devices, integrated circuits and micro electro mechanical systems (MEMS). In general the co-existence of electric, magnetic, thermal and mechanical effects characterises the global behaviour of any electrical drives or systems. The main topics of ICEM’2004 meeting are listed below, selected to either oral or poster session
Oral session
Industrial applications
Permanent magnet machines
Special machines
Control drives and generators
Controlled drives for special applications
Controlled drives for special applications, actuators
Finite element methodology
Modelling and simulation
Modelling and simulation of induction motors
Wind generators
Thermal, acoustic noise and vibration aspects
Testing, measurements, monitoring and diagnostics
Transformers, special machines
Use of advanced materials
Linear drives
Poster session
Permanent magnet machines
Special machines
Special machines, actuators
Finite element methodology
Modelling and simulation
Wind generators
Thermal, acoustic noise and vibration aspects
Testing, measurements, monitoring and diagnostics
Transformers, use of advanced materials and new technology
Control drives and generators
Linear machines
It not only makes some order in reading but also it somehow represents the main directions which are penetrated by researchers dealing with modern electrical drives. Looking at the content of the conference proceedings one may also notice that the more and more researchers go into the investigation of new applications of computer engineering, especially these connected with software methodology, CAD techniques, system control, and material sciences. The computational techniques which have been under development during the last three decades and are being still developed serve as good tools for discovering new phenomena.
We, the guest editors of COMPEL Journal, would like to express our thanks to our colleagues who have contributed to this issue.
The papers accepted for this issue concerns the following leading problems:
A numerical routine design calculation module for treating the magnetic circuit of hydrogenerators.
Design process of a new structure for the induction motor with a stator core made from amorphous iron it is necessary to apply the circuit method and the field-circuit method. The use of the circuit method allows quick calculations of many versions of the designed motor, but the use of the field-circuit method is necessary for verification of the maximal value of the flux density in the entire area of the cross-sections of the motor core.
A new procedure to optimize the geometry of an electric motor for hybrid vehicles, based on an optimization model implementing the complex specifications, environment sizing constraints and vehicle operating points.
A practical design tool employing a general purpose electromagnetic finite element software package to perform automated simulation and performance analysis of induction motors in a design and optimisation process.
Analysis of the accuracy of the thrust force of a linear actuator computed with different finite elements models. Two- and three-dimensional models corresponding to different levels of approximation of the original problem are studied. A reliable error estimator based on dual magnetostatic formulations is used.
A general method for coupled simulation of electrical machines and circuits,using finite element analysis and a circuit/system simulator is proposed.
An air-gap element for electrical machine simulation for static and dynamic rotor eccentricity is developed. The air-gap element technique is extended to account for a non-centred rotor. The consistency, stability and convergence of the discretization error are studied. A specialised efficient solution technique combining the conjugate gradient algorithm with fast Fourier transforms is developed.
Methodology enabling oscillations analysis in variable speed permanent generator wind-turbines.
A new method for the determination of motor characteristics by means of FE-methods suitable for multi-variable design processes.
Theoretical and experimental evaluation of the static and dynamic characteristics of a single-phase claw-pole motor using soft magnetic composite for the stator core.
A new approach for improvement and optimization of synchronous claw-pole alternators without changing the general machine design.
Computational validation of the new concept of the rotor for the two-degree of freedom spherical actuator.
Three dimension modelling technique of voltage forced electromechanical actuator takes into account: motion, magnetic non-linearity and eddy current phenomena.
Trigonometric interpolation in combination with the sliding-surface technique for modelling rotation in electrical machine models discretised by the finite integration technique.
Three dimensional approach of both time-harmonic and non-linear transient finite element analyses for the eddy currents using a magnetic vector potential formulation for the generator pole pitch.
A method of calculation of eddy current losses in the stator clamping parts of large hydro generators for the purpose of the initial design and the design optimization with local thermal hot-spots due to the non-linear magnetic behaviour of the clamping plate.
Study of the inclusion of inter-bar currents in a multi-slice finite element model of induction motors, associated with skew discretisation and inter-bar resistance, validated experimentally.
Investigation of pole face heating in large, salient pole generators and establishing a modelling procedure for accurate rotor pole heat loss computation using finite element analysis.
The combination of finite-element method and boundary-element method is applied to simulate the electromagnetic, mechanical, and acoustic behaviour of an induction machine with squirrel-cage rotor.
The iron loss analysis of the linear oscillating actuator is performed by using ANSYS and iron loss curves, which is obtained by an Epstein test apparatus.
An automatic design method of a high power density motor is proposed using only the requirements (torque and speed) and information about sources (voltage and current).
A general framework for the electromagnetic analysis of axial flux motors and generators. The procedure is based on the solution of Maxwell’s equation in a cylindrical frame. All field sources (permanent magnets, windings)are subdivided into filamentary windings, while the slotting and skewing are taken into account.
AN algorithm of modelling of the synchronous machines replaces inductances by the distributions of flux densities, which were used for their definition,obtained from finite element solutions. Mathematically, the analysis is converted from the space of trigonometric functions to the more general space of periodic functions.
S. WiakGuest Editor
M. Dems and K. KomezaCo-Editors
