International Journal of Applied Electromagnetics and Mechanics - Volume 46, issue 2

Authors: Pyrialakos, Georgios G. | Kantartzis, Nikolaos V. | Tsiboukis, Theodoros D.

Article Type: Research Article

Abstract: A consistent time-domain methodology for the systematic design and broadband assessment of complicated nanostructured EMC devices is introduced in this paper. The novel technique combines a family of nonstandard locally one-dimensional finite-difference time-domain schemes with the advanced features of contemporary graphics processor units in general curvilinear coordinates which preserve the hyperbolic profile of Maxwell's laws. In this way, the resulting formulation remains completely explicit and generates effective dual meshes free of artificial …vector parasites or spurious modes, while the frequency-dependent attributes of every setup are successfully modelled. Numerical results reveal the significant reduction of dispersion errors along with the considerable speedup compared to serialised realisations through various fabric/epoxy devices with nanocomposite media. Show more

Keywords: Nonstandard schemes, unconditionally-stable techniques, FDTD method, GPU computing, EMC problems

DOI: 10.3233/JAE-141950

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 2, pp. 389-399, 2014

Authors: Schröder, Michael | Franck, David | Hameyer, Kay

Article Type: Research Article

Abstract: The structural dynamic simulation of electrical machines is an appropriate tool to improve electrical machines in an early design stage, in consideration of their acoustic and vibration properties. In order to reduce the calculation effort, a time efficient method is desirable. Unit-force transfer functions describe the linear behavior of the structure when it is excited with unit-force waves in the machine's air gap. In this paper, magnitude- and phase-correct transfer functions are simulated numerically for …an exemplary machine and then verified by measurements. With those transfer functions, the structural response of the machine can be calculated fast for different operating points. Show more

Keywords: Structural dynamic simulation, structural description, electrical machine, acoustic, vibration, unit-force, complex transfer function

DOI: 10.3233/JAE-141951

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 2, pp. 401-407, 2014

Authors: Smółka, Krzysztof | Wiak, Slawomir | Napieralska-Juszczak, Ewa

Article Type: Research Article

Abstract: In presented work the Finite Element Methods combined with MATLAB was introduced. This strategy enables changing of all parameters of a few types of magnetic motors and electrostatic micromotors MEMS. Furthermore, this strategy allowed for taking advantage of FEMM, namely possibility of calculations of complicated geometries without additional operations.

Keywords: Motors, SRM, PMM, micromotor, finite element methods, femm, matlab

DOI: 10.3233/JAE-141952

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 2, pp. 409-417, 2014

Authors: Witczak, Pawel | Swiniarski, Jacek

Article Type: Research Article

Abstract: Magnetic vibration forces in PM motor were obtained by finite elements analysis of 2D magnetic field followed by 2D Fourier transform. The dominated modal components of force spectrum were applied in 3D structural model preserving their rotational character.

Keywords: Permanent magnet motor, finite elements, magnetic forces, vibration, spectral analysis

DOI: 10.3233/JAE-141953

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 2, pp. 419-425, 2014

Authors: Xiao, Song | Li, Yinjiang | Rotaru, Mihai | Sykulski, Jan K.

Article Type: Research Article

Abstract: Due to unavoidable uncertainties related to material properties and manufacturing processes, the robustness of the optimal solution must be considered when designing electromagnetic devices. In this paper, the worst-case optimisation (WCO) and the worst-vertex-based WCO are proposed to evaluate the robustness of both performance and constraints under uncertainty. To reduce computing times when searching for the robust solution a predicted objective function is used, obtained with the help of a kriging algorithm which …explores the searching space using the concept of rewards. Finally, to avoid some of the shortcomings of WCO, the concept of average performance evaluation is developed. Show more

Keywords: Robust optimisation, CAD in electromagnetics, kriging

DOI: 10.3233/JAE-141954

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 46, no. 2, pp. 427-436, 2014