International Journal of Applied Electromagnetics and Mechanics - Volume 51, issue s1

Authors: Idziak, Paweƚ | Kowalski, Krzysztof | Nowak, Lech | Knypiński, Ƚukasz

Article Type: Research Article

Abstract: The paper deals with a magnetostrictive fast-acting actuator applied as a driving device for plasma valve designed for so called ``high intensity plasma pulses gun''. The actuator is characterized by a small displacement, but with a very short response time - below 0.1 ms. A structure with an axisymmetrical actuator energised by discharged pulses of a capacitor has been proposed. The field-circuit mathematical model of the dynamic operation of the actuator has been applied. The model includes: the equation of transient electromagnetic field in a non-linear ferromagnetic material and equation of electric circuit. The computer software has been elaborated. Results …of simulation are presented. Show more

Keywords: Magnetostriction, fast-acting actuators, finite element analysis, transient analysis

DOI: 10.3233/JAE-2011

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S81-S87, 2016

Authors: Li, Min | Silva, Rodrigo | Lowther, David

Article Type: Research Article

Abstract: This paper presents an optimization framework for the robust design of electrical machines. During the run of a genetic algorithm, all evaluated solutions are kept in an archive, and are used to build different meta-models for the assessment of robustness. The proposed robust design algorithms are verified using analytical test functions and are shown to be efficient and accurate. They have also been applied to the robust design of a surface mount permanent magnet machine considering manufacturing imprecision and different optimal designs (robust and non-robust) are obtained.

Keywords: Evolutionary algorithm, meta-modeling, robust design

DOI: 10.3233/JAE-2013

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S89-S95, 2016

Authors: Di Barba, Paolo | Mognaschi, Maria Evelina | Savini, Antonio | Wiak, Sƚawomir

Article Type: Research Article

Abstract: The paper deals with a multi-objective optimization method inspired by island biogeography. Specifically, a non-linear model of migration is proposed: a sinusoidal law rules both immigration and emigration curves in order to match the natural behaviour which is observed in a natural habitat. The optimal shape design of an electrostatic micromotor, which is a benchmark in MEMS design, is considered as the case study.

Keywords: Biogeograpy optimization, MEMS

DOI: 10.3233/JAE-2015

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S97-S105, 2016

Authors: Papezova, Maria | Faktorova, Dagmar

Article Type: Research Article

Abstract: The structural integrity of any replacement has to be tested to prevent premature failure and thus maintaining the reliability of the implant. The study on physical properties of biomaterials now-a-days plays an important role in understanding their nature. Our aim is the investigation of the possibility to use microwave resonant methods for in vivo and in vitro testing of homogeneity of dental materials. In this article, we pay attention to find the electromagnetic properties (both dielectric parameter and scattering parameters dependent on frequency) of explored material. We started to measure dielectric properties of very often used material in dental practice …- poly methyl methacrylate (PMMA) and realize the schemes in software simulation. Simulation allows quick and precise analysis of the frequency dependence of scattering parameter - S11 for PMMA. Show more

Keywords: Biomaterial, dielectric parameters, Hippel method, microwave, scattering parameters

DOI: 10.3233/JAE-2017

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S107-S113, 2016

Authors: Cvetkovski, Goga | Petkovska, Lidija

Article Type: Research Article

Abstract: In this paper a genetic algorithm based optimal design of an axial flux permanent magnet motor (AFPMM) is proposed. This approach employs a genetic algorithm (GA) technique as a search tool for optimal design solution of a AFPMM based on the value of the objective function. The sum of the efficiency of the motor, the inverse value of the permanent magnet total mass and the inverse value of the total copper mass is selected as a multi-objective function. An overall comparative analysis of the optimisation parameters and the values of certain important motor parameter of the prototype model and the …optimal solution motor is presented. Show more

Keywords: Axial flux permanent magnet motor, multi-objective optimization, genetic algorithm, finite element analysis

DOI: 10.3233/JAE-2006

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S115-S123, 2016

Authors: Di Barba, Paolo | Dughiero, Fabrizio | Forzan, Michele | Sieni, Elisabetta

Article Type: Research Article

Abstract: Magneto-Fluid Hyperthermia (MFH) is a clinical treatment of cancer that exploits a magnetic nano-fluid to heat pathological tissues by means of a time-harmonics magnetic field: nanoparticles injected in cells cultured in a Petri dish are subject to the external field and heat. The optimal design of an inductor has been developed by resorting to a migration-assisted NSGA (M-NSGA) strategy. M-NSGA results are compared with the ones obtained using NSGA-II and two others modified NSGA algorithms. One version of NSGA includes a Design Of Experiment (DOE) step that generates a set of individuals which will be included in the initial population. …The primary goal is to identify the inductor geometry generating a uniform magnetic field inside the Petri dish that contains the magnetic fluid. Show more

Keywords: Magneto-Fluid-Hyperthermia, multi-objective optimization, Pareto front, Finite Element Analysis

DOI: 10.3233/JAE-2019

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S125-S134, 2016

Authors: Kim, Sung-An | Choi, Gui-Dong | Lee, Ju | Cho, Yun-Hyun

Article Type: Research Article

Abstract: In electric power steering (EPS), spoke type brushless ac (BLAC) motors offer distinct advantages over other electric motor types in terms of torque smoothness, reliability and efficiency. This paper deals with the shape optimization of spoke type BLAC motor, in order to minimization cogging torque. In this paper examines, 3 step skewing rotor angle, optimizing rotor core edge and rotor overlap length for minimize cogging torque in spoke type BLAC motor. The methods were applied to existing machine designs and their performance was calculated using finite- element analysis (FEA). Prototypes of the machine designs were constructed and experimental results obtained. …It is shown that the FEA predicted the cogging torque to be nearly reduce using those method. Show more

Keywords: EPS, 3-step skewing, spoke type BLAC, cogging torque, FEA, optimization

DOI: 10.3233/JAE-2005

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S135-S145, 2016

Authors: Silva, Rodrigo | Li, Min | Lowther, David A.

Article Type: Research Article

Abstract: Space-Mapping (SM) is a recognized and successful engineering optimization paradigm. It replaces the optimization of a high-fidelity model by an iterative process of optimization and update of a low fidelity, but cheap to evaluate, model. In spite of its success, its performance greatly depends on how fast and on how accurate the cheap model is. In this work, utilizing the optimization of an IPM motor as a test bed, we make a thorough experimental study of a number of coarse models of varying accuracy and execution times. The main goal is to show how the characteristics of the coarse models …affect the SM performance. Show more

Keywords: Deterministic optimization, interior permanent magnet motor, meta-modeling, space-mapping

DOI: 10.3233/JAE-2020

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S147-S156, 2016

Authors: Paganotti, André L. | Afonso, Márcio M. | de Oliveira, Tarcísio A.S. | Schroeder, Marco Aurélio O. | Alipio, Rafael | Gonçalves, Eduardo N. | Saldanha, Rodney R.

Article Type: Research Article

Abstract: This paper presents a computational tool intended to achieves optimal configurations of conductors with capacity of transmission of energy improved. This arrangement is obtained by calculate and minimize of electric fields at ground level of High Surge Impedance Loading transmission lines. This type of transmission line has higher power transmission rates by utilizing optimized configuration for the conductors. In the present work, an enhanced Deep Cut Ellipsoidal Method is applied to find a new optimized configuration for the phase conductors. The Surge Impedance Loading of the suggested configuration is analyzed. The new proposed configuration results in reduced profiles of electric …fields and higher power transmission capacity. Show more

Keywords: Ellipsoidal method, HSIL, transmission lines

DOI: 10.3233/JAE-2016

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S157-S165, 2016

Authors: Böhmer, Stefan | Hameyer, Kay

Article Type: Research Article

Abstract: Non-conforming sliding interfaces can be used in finite element (FE) simulations for the flexible implementation of the relative motion between stator and rotor of e.g. electrical machines. Lagrange multipliers are applied to ensure the continuity of the field across the non-conforming interface. A previously proposed approach is extended by time stepping methods to consider eddy-currents. In this paper, the formulation is presented and applied to a benchmark problem to validate the approach.

Keywords: Sliding interfaces, lagrange multiplier, mortar method, electrical machine, eddy-currents

DOI: 10.3233/JAE-2004

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S167-S172, 2016

Authors: Majer, Krzysztof

Article Type: Research Article

Abstract: This paper presents a method for specifying the magnetostrictive vibrations of the transformer cores operating with different submagnetizing of DC flux (for the flow of DC flux through magnetic circuit and as a yoke flux) and for different values of supply voltage (flux density in the core). The theoretical method to determine the content of higher harmonics of magnetostrictive vibrations of the cores was developed. The computation and corresponding measurements were performed for single phase and three phase, three and five legs transformer cores. The discussion was carried out in the frequency range from 50 to 1000 Hz.

Keywords: Magnetostriction, transformer, vibration, DC flux

DOI: 10.3233/JAE-2014

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 51, no. s1, pp. S173-S182, 2016