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  • 1
    Electronic Resource
    Electronic Resource
    An improved technique for enhancing diversity in Pareto evolutionary optimization of electromagnetic devices (2001)
    Bradford : Emerald
    Compel 20 (2001), S. 482-496 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: When a multiobjective optimization problem is tackled using Pareto optima theory, particular care has to be taken to obtain a full sampling of the Pareto Optimal Front. This leads to variability of individuals in both design space and objective space. We compare two different fitness assignment strategies based on two individual sharing procedures in the space domain and in the objective domain on some test cases.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640110383366
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  • 2
    Electronic Resource
    Electronic Resource
    Optimal shape design of devices and systems for induction-heating: methodologies and applications (2003)
    Bradford : Emerald
    Compel 22 (2003), S. 111-122 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: The paper reports recent experiences of the authors in the automated optimal design of devices and systems for induction heating. The results presented have been obtained in the frame of a long-lasting cooperation between Laboratory of Electroheat, University of Padova and Electromagnetic Devices CAD Laboratory, University of Pavia. In particular, two case studies are discussed; in both cases, the shape design of the inductor is carried out in a systematic way, by minimizing user-defined objective functions depending on design variables and subject to bounds and constraints. When the design problem is characterized by many objectives which are in mutual conflict, the non-dominated set of solutions is identified.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640310452213
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  • 3
    Electronic Resource
    Electronic Resource
    Optimal design of an inductor for transverse flux heating using a combined evolutionary-simplex method (2001)
    Bradford : Emerald
    Compel 20 (2001), S. 507-522 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Transverse flux induction heating (TFH) is a process advantageously applied for the heat treatment of thin non-ferrous metal strips. In comparison with the better known longitudinal flux heating the design of TFH inductors is more complex. In fact both the prediction of power density distribution in the strip and the calculation of the thermal transient during the heating process require a solution of 3D electromagnetic and thermal problems. Moreover the requirements for a good inductor design are in conflict with each other. In the paper a code for the solution of 3D electromagnetic and thermal problems suitable for the design of TFH systems is presented. The analytical-numerical approach (analytical for the electromagnetic problem, numerical for the thermal one) is suitable for coupling with optimisation algorithms. Both evolutionary strategy and simplex methods and their combination have been used in order to obtain an optimal design for a particular application of TFH.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640110383384
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  • 4
    Electronic Resource
    Electronic Resource
    Effect of the non-linearity of demagnetization curves on the torque of hybrid stepping motors with permanent magnets in slots (1998)
    Bradford : Emerald
    Compel 17 (1998), S. 318-323 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: The recent achievements in electronic control as well as the higher performance of advanced permanent magnets have brought about a change in the general strategy for design and development of new types of small electrical machines. A special application of permanent magnets (PM) is represented by hybrid stepping motors (HSM). The latter are a sort of combination of variable reluctance-motors and permanent magnet-motors. The influence of various PM inserts into the magnetic circuits of electromechanical converters on field and force distribution has been already investigated by the authors (1996). Promising results for HSM have been reported, especially when rare-earth PMs are used. The main aim of PM inserting, when they are put into slots of slotted pole shoes with radial N-S polarization, is to focus magnetic field lines in the corresponding teeth. As a result, the reluctance stepping torque can be increased depending on the material used. Now a further step is made by extending the analysis from the case of linear to that of non-linear demagnetization curves of permanent magnets.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649810693474
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  • 5
    Electronic Resource
    Electronic Resource
    Optimal shape design of a high-voltage test arrangement (2004)
    Bradford : Emerald
    Compel 23 (2004), S. 633-638 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Discusses the automated shape design of the electrodes supplying an arrangement for high-voltage test. Obtains results that are feasible for industrial applications by means of an optimisation algorithm able to process discrete-valued design variables.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640410543482
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  • 6
    Electronic Resource
    Electronic Resource
    Optimal shape design of the HV winding of a test transformer (1998)
    Bradford : Emerald
    Compel 17 (1998), S. 128-134 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: In the paper, attention is focused on a class of single-phase transformers that are employed when a high-voltage withstand test is required for verifying the quality of the dielectric insulation of a given component. The HV winding of this kind of transformer is made up of several layers, characterized by height that decreases along with the increase of the voltage profile in order to keep the distance between winding and ground within acceptable limits. Therefore, the designer of such devices is mainly concerned with the shaping of the HV winding; starting from a tentative configuration, he has to find the winding shape such that the electric breakdown cannot occur, at the same time keeping the volume of oil and active materials as small as possible. Traditionally, the design is developed by means of a trial-and-error approach based on a sequence of field analyses, varying a design variable at a time; the paper shows how the design problem can be solved more efficiently by optimizing the profile of the winding in an automatic way.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649810203053
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  • 7
    Electronic Resource
    Electronic Resource
    Recent experiences on mixed finite elements for 2D simulations of magnetic fields (1998)
    Bradford : Emerald
    Compel 17 (1998), S. 674-681 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: A mixed formulation of two-dimensional magnetostatic problems, where both B and H are unknowns, is considered. The solution is obtained by minimizing the residual of the constitutive law, imposing Maxwell's equations as constraints by means of Lagrange multipliers. When a finite element discretization involving face and edge elements is applied, we have to solve a linear system whose algebraic treatment presents some difficulties. In the paper, the attention is focused on the computational aspects of the proposed methodology with special emphasis on the choice of algebraic solvers and of possible preconditioning techniques. A case study, concerning the field analysis of a magnetic screen, is presented and discussed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649810221125
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  • 8
    Electronic Resource
    Electronic Resource
    Field methods and computational techniques (2000)
    Bradford : Emerald
    Compel 19 (2000), S. 165-375 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Gives introductory remarks about chapter 1 of this group of 31 papers, from ISEF 1999 Proceedings, in the methodologies for field analysis, in the electromagnetic community. Observes that computer package implementation theory contributes to clarification. Discusses the areas covered by some of the papers - such as artificial intelligence using fuzzy logic. Includes applications such as permanent magnets and looks at eddy current problems. States the finite element method is currently the most popular method used for field computation. Closes by pointing out the amalgam of topics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/EUM0000000005355
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  • 9
    Electronic Resource
    Electronic Resource
    Recent advances of automated optimal design in low-frequency electromagnetics: A survey (1998)
    Bradford : Emerald
    Compel 17 (1998), S. 29-35 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: The main goal of this paper is to show the constant growth of recent research work on automated optimal design of low-frequency electromagnetic systems by reviewing the current literature on the topic.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321649810202955
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  • 10
    Electronic Resource
    Electronic Resource
    Identifying material properties of a dielectric motor (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 796-804 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - The purpose of the paper is to define a methodology for identifying the electric conductivity and permittivity of lossy dielectric materials employed in a class of small dielectric motors, knowing the motor torque. Reference is made to data measured on an existing prototype. Design/methodology/approach - The motor operates because of the interaction between a rotating electric field, generated by a three-phase system of electrodes, and the charge density induced at the surface of the rotor, which lags with respect to the field. The stator and the rotor are hollow cylinders made of dielectric materials. A finite-element model of the motor has been developed. For a given set of material properties, the time-averaged value of starting torque acting on the rotor is evaluated by means of the Maxwell stress tensor. Findings - A family of curves of starting torque vs conductivity for different values of rotor permittivity are obtained. Each curve is well approximated by a Lorentz distribution. Originality/value - A field model of the motor was exploited to estimate the conductivity that gives rise to a prescribed value of the starting torque. The solution of the underlying inverse problem, which is ill-posed, can give an helpful insight for maximizing the torque.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510598148
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