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  • 1
    Electronic Resource
    Electronic Resource
    Identification and simulation of a circuit-based model of magnetic hysteresis (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 534-545 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - The scope of the work is to provide an identification procedure for an hysteresis model based on nonlinear circuit cells. Design/methodology/approach - An identification procedure for an hysteresis model based on nonlinear circuit cells is presented. The response of elementary cell is equal to a generalized play operator. The procedure allows the identification of the limit symmetric hysteresis loop and of minor loops. The identification procedure is based on the relationship between the circuit parameters and the discretization of the first derivative of the BH curve by means of a staircase function. Findings - The model obtained is employed for the simulation of soft magnetic composite material cores under different supply voltage waveforms. The proposed identification procedure is able to define an accurate model of an hysteretic material with a low number of elemental network cells. The identification algorithm is simple and makes use of the limit hysteresis cycle only. Symmetric minor loops are used to tune "soft" operators for the correct reconstruction of cycles which do not reach saturation. Research limitations/implications - The model is limited to scalar and static hysteresis model. Practical implications - The model obtained can be used in network simulator like SPICE in order to model circuits in which magnetic devices are involved. Originality/value - The circuit hysteresis model has been presented in literature, while its identification is newly proposed by the authors.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510586150
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Analytical and finite element design optimisation of a tubular linear IPM motor (2001)
    Bradford : Emerald
    Compel 20 (2001), S. 777-795 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: The optimisation of a tubular linear motor with interior permanent magnets is described. For a rapid design the whole process is divided in three parts: an analytical approach for the a preliminary investigation, a parametric analysis by means of a finite element method and an optimisation. The obtained results show that the adopted optimisation process is efficient for rapid and effective optimisation of the tubular linear motor.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640110393789
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    An integral approach based on dual discretization and method of moment for the solution of static electric field (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 446-457 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - The scope of the work is to provide an hybrid numerical technique for the solution of electric field. Design/methodology/approach - In this paper an integral approach for the solution of static electric field based on a dual discretization (DD) and on a surface method of moment (MoM) is presented. The proposed technique is applied to the solution of 3D electric field problems where different perfectly conducting bodies are placed in a homogeneous and isotropic medium. The approach is also extended to the analysis of static current field. In the presented formulation MoM is applied on a surface domain which is discretized according to a baricentrical dual scheme. Findings - The procedure has been applied to several practical cases and it represents an efficient tool for the evaluation of lumped circuit parameters as capacitances of 3D conducting bodies and ground resistance of grounding systems. Research limitations/implications - The formulation presented in the paper is limited to the calculus of electric field in homogeneous media. For future development the authors are working in order to include non-homogeneous media. Practical implications - The proposed approach aids the designer of electrical systems as large scale grounding systems or integrated circuit connections in the calculations of lumped electrical parameters. Originality/value - The originality of the paper lies in the coupling of MoM with finite formulation and DD.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510586088
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Genetic optimisation of radial eddy current couplings (2005)
    Bradford : Emerald
    Compel 24 (2005), S. 767-783 
    Details
    ISSN: 0332-1649
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Electrical Engineering, Measurement and Control Technology , Mathematics
    Notes: Purpose - The purpose of this paper is to obtain a fully analytical model of an eddy current coupler and to use it in a multi-objective optimisation algorithm. Design/methodology/approach - Analytical expressions of device performances are adopted in the objective function and are obtained from a closed solution of the field problem. The optimisation has been carried out by considering both the torque and the momentum of inertia of the object. Two different structures have been considered. Findings - A fully analytical expression of the torque has been obtained for two different geometrical configurations. The optimisation procedure has been used to compare these structures and it is possible to observe that the DSPM performances are better than the SSPM ones. Research limitations/implications - To obtain a closed form of the torque function, the non-linearities of the iron have been neglected. Nevertheless, in the optimisation procedure has been limited the magnetic flux density in the iron core to a feasible value in the linear part of the ferromagnetic characteristic. The thermal effects have been neglected. Pratical implications - In the industry, eddy current couplers can be used as transmission, dampers and brakes. The use of objective functions (OFs) in a closed formulation allows to perform a light optimisation from the point of view of the time computation and to drastically increase the development efficiency. Originality/value - In this paper, a model for computing the electromagnetic behaviour of eddy current couplers is presented. The optimisation of both the torque and the inertia momentum allows to obtain good static and dynamic performances.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/03321640510598120
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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