International Journal of Applied Electromagnetics and Mechanics - Volume 32, issue 4

Authors: Amrane, Samia | El Hadi Latreche, Mohamed | Feliachi, Mouloud

Article Type: Research Article

Abstract: In this paper, we present a model dedicated to the resolution of the inverse problem concerning the design and the dimensioning of an inductor which generates a desired magnetic field. The algorithms of optimization are combined with a semi analytical model which is based on the coupled circuit's theory. The latter makes it possible to predict the distribution of the currents density in the turns of the inductor and then to determine its electrical resistance and …inductance. Therefore, it lends itself well to the optimization of the inductor parameters. A comparative study between the use of a deterministic algorithm and another stochastic type of Simulated Annealing will be presented. The results obtained show that this approach is effective, precise and especially very fast for the optimization of the inductor parameters. Show more

Keywords: Inductor design, magnetic field, semi analytical, coupled circuits, inverse problem, deterministic and stochastic algorithm of optimization

DOI: 10.3233/JAE-2010-1074

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 195-206, 2010

Authors: Rybin, Oleg | Raza, Muhammad

Article Type: Research Article

Abstract: Analytical and numerical optimization method for evaluating the complex effective dielectric and magnetic constants of elementary flat slab of metamaterial is presented. The minimization problem is solved for a cascaded network representation of the slab utilizing the Effective Medium Theory. The algorithm is benchmarked using the free Meep FDTD software package.

Keywords: Metamaterials, microwave characterization, effective medium theory, optimization algorithm, non-linear mathematical programming

DOI: 10.3233/JAE-2010-1075

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 207-218, 2010

Authors: Canova, Aldo | Freschi, Fabio

Article Type: Research Article

Abstract: The paper proposes a multiobjective optimization to design a radial eddy current coupler, where the torque is maximized while the momentum of inertia is minimized to improve the dynamic behavior of the device. An analytical solution of the electromagnetic problem is used to speed up the computation of objectives and an optimization algorithm based on the emulation of the immune system behavior, referred to as Vector Immune System, is adopted to find tradeoff solutions between objectives. …The solutions found so far are compared with solutions obtained by a Genetic Algorithm with fuzzy scalarization of objectives. It shows a faster convergence with a better spread of trade-off solutions available for a higher level decision making. A deep analysis of these Pareto optimal configurations is also provided, trying to discover common properties of optimal solutions. Show more

Keywords: Multiobjective optimization, artificial immune systems, analytical models, eddy current devices

DOI: 10.3233/JAE-2010-1079

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 219-236, 2010

Authors: Arab-Tehrani, Kambiz | Colteu, Adrian | Rasoanarivo, Ignace | Michel-Sargos, Francois

Article Type: Research Article

Abstract: This paper deals with a new high intensity magnetic separator with permanent magnets. We present a new system having little energy consumption. This model consists of compression springs, small motors, levers, and the slider rail which consists of iron blocks. The objective of this paper is to retrieve the granular ferromagnetic and paramagnetic minerals. We know that for magnetic separation systems with the permanent magnets, we can not cut immediately the magnetic field in the matrices …for retrieving the magnetic granular minerals. In this model we have two different air-gaps; the first air-gap is for matrices installation and the second is used to change the reluctance in order to increase or decrease magnetic field in the magnetic circuit. In this system the carousel is fixed and the matrices can move. We will calculate the maximum magnetic force necessary in the second air-gap in order to send out the matrices after filling with magnetic minerals for washing and recovering materials. We will compare the theoretical results with the simulation results by COMSOL and FEMM4. Show more

Keywords: New separate magnetic, magnetic force, spring, permanent magnet, matrix

DOI: 10.3233/JAE-2010-1080

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 237-248, 2010

Authors: Al-Sharif, Lutfi | Taifour, Sinan | Kilani, Mohammad

Article Type: Research Article

Abstract: A methodology has been developed for the simulation and experimental verification of the axial force exerted by an electromagnet on a concentric permanent magnet. This comprises four stages. The first involves the modeling of the permanent magnet as a current sheet based on the permanent magnet material and its dimensions. This current sheet model is then discretised into a number of coils. The second stage involves the prediction of the radial magnetic flux density from the …electromagnet at any point off its axis. The third stage involves the calculation of the axial force exerted by the electromagnet onto a concentric current carrying ring along its axis. The fourth stage involves the calculation of the axial force exerted by the electromagnet onto a number of contiguous rings that represent the model of the permanent magnet developed in the first stage. Experimental verification has been carried out for the fourth stage by the measurement of the resultant force by the use of weights. The method was implemented in matlab for all the four stages. In addition to the experimental verification, PC based verification was also carried out against a FEM software for the results from all the four stages. Show more

Keywords: Linear actuator, permanent magnet, solenoid, finite element method

DOI: 10.3233/JAE-2010-1082

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 249-265, 2010

Authors: Olaru, R. | Petrescu, C. | Hertanu, R.

Article Type: Research Article

Abstract: The paper studies an actuator based on magnetofluidic forces acting on a non-magnetic disc plunged into a ferrofluid that is exposed to a non-uniform magnetic field generated by magnetic inductor(s). The input output equations (force – current and displacement – current) that describe the behaviour of two types of actuators are established. The expression of the force generated on the nonmagnetic disc is determined analytically for the particular conditions imposed by the two actuator configurations: a) …simple, with one magnetic inductor; b) differential, with two inductors. The derived relations enable a comparative study of the two types of actuators. The results show the superior performance of the differential actuator. The latter was tested as a current to displacement transducer in an electropneumatic converter. Show more

Keywords: Magnetic actuator, ferrofluidic actuator, magnetic force, ferrofluid, magnetic fluid

DOI: 10.3233/JAE-2010-1083

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 32, no. 4, pp. 267-274, 2010