... Halbach array with a one-pole pair is carried out by means of the AAA-least squares method, focusing on vector potential and flux density in the bore and validating results by means of classic finite element software. Finally, the investigation is completed by a finite difference analysis. Findings...

... with the design of an MRI compatible electrical actuator. Three-dimensional electromagnetic and thermal analytical models have been developed to design the actuator. These models have been validated through 3D finite element (FE) computations. The analytical models have been inserted in an optimization procedure...

... the optimization procedure, the iron yoke of the proposed structure is simplified to a cylindrical shape. In this case, a non-linear axisymmetric two-dimensional (2D) finite elements model has been developed to compute the static magnetic field distribution and the gradient magnetic field. Then, the model has been...

... of the appropriate complex feeding weights, required to set nulls along the propagation directions of the unwanted signals and a maximum towards the propagation direction of the desired incoming signal. The featured technique, combined with a modified finite element method, is applied to the design of a new family...

...Kaoutar Hazim; Guillaume Parent; Stéphane Duchesne; Andrè Nicolet; Christophe Geuzaine Purpose This paper aims to model a three-dimensional twisted geometry of a twisted pair studied in an electrostatic approximation using only two-dimensional (2D) finite elements. Design/methodology/approach...

... magnetostatics Regularization methods Finite elements Inverse problems Finite element analysis Magnetic device Recovering a current distribution from field measurements can be formulated as a source synthesis problem (Isakov, 1990). Inverse problems of this kind are usually ill-conditioned due...

..., and a refined model is presented by means of investigating accuracies in a case study with three subdomains. Design/methodology/approach The accuracies, refined by Richardson extrapolation to zero error, are compared to finite element (FEM) and finite difference methods. The boundary matching procedures can...

... for any working frequency, an optimization strategy based on coupling of finite elements analysis and genetic algorithm is applied. The purpose of this paper is to define the parameters of the total and partial segmentation that can ensure the best reduction of eddy current losses. Design/methodology...

...Oszkár Bíró David A. Lowther; Piergiorgio Alotto; S. Rainer O. Bíró; A. Stermecki Purpose Different solution methods, using finite element method in continuous and discrete frequency domain, are compared with each other in order to find the most appropriate method for the estimation of steady...

... rotor slots. Conventional calculation using analytical tools could not calculate precisely the required parameters in order to obtain an optimal model to build a prototype that its properties confirm that calculated values with the model. With a finite element method application for magnetic field...

...Christian Kaehler; Gerhard Henneberger This paper deals with 3D finite‐element calculation of eddy currents in the claws of a claw‐pole alternator taking the rotational geometry movement into account. Two transient edge‐based vector formulations are utilised. The reduction of the model to only one...

...M. Rausch; M. Gebhardt; M. Kaltenbacher; H. Landes In this paper, an efficient magnetomechanical calculation scheme based on the finite element method is presented. This scheme is used for the precise forecast of the dynamical behavior of a clinical magnetic resonance imaging scanner. The validity...

... to the optimal ones. However, this method induces the disadvantage of evaluating the gradient of the objective function at the discretization points. When f, the function to be approximated, comes from a finite element computation, these gradients are generally not directly available but are obtained...

...Patrick Dular; Patrick Kuo‐Peng An efficient and robust time discretization procedure of theta type is proposed in the frame of the finite element‐circuit equation coupling for electronic circuits with switches, i.e. the use of diodes, thyristors and transistors. This procedure enables the use...

...‐Raphson scheme dealing with the non‐linear material characteristics is applied. The numerical oscillations appearing in the finite element model at high velocities are overcome by an adaptive mesh refinement technique combined with the artificial diffusion upwind technique. End effects due to the finite...

...Paolo Fernandes; Mirco Raffetto From a theoretical point of view the question of spurious modes has been regarded as a closed problem. However, in this paper we show that even a precise definition of spurious‐free approximation was lacking. Hence, a sound definition of spurious‐free finite element...

... distribution in the different parts of the machine is shown. Transverse flux Eddy current Finite elements Different topologies of transverse flux machines have been developed at the Department of Electrical Machines in Aachen (Bork and Henneberger, 1996; Blissenbach and Henneberger, 1999 a,b...

...Qinghua Li; Siri Weerasooriya; Teck‐Seng Low In this paper a prototype actuator designed for a high bandwidth servo system is modeled and analyzed using finite elements. Natural frequencies and mode shapes of frequencies below 10kHz are extracted using frequency analysis and compared...