International Journal of Applied Electromagnetics and Mechanics - Volume 60, issue S1

Authors: Otomo, Yoshitsugu | Igarashi, Hajime

Article Type: Research Article

Abstract: This paper presents three-dimensional topology optimization of magnetic cores for wireless power transfer with double-sided winding coils. In this optimization, the magnetic core shape is represented by the linear combination of the normalized Gaussian functions. The core shape is optimized so that the coupling coefficient between the transmitting and receiving coils is maximized. Moreover, robustness against misalignment between the coils is taken into account in the optimization. It is found that the optimized core shape effectively increases the net magnetic flux interlinked with the receiving coil, and outperforms the conventional core shapes.

Keywords: Electric vehicle, genetic algorithm, robust optimization, topology optimization, wireless power transfer

DOI: 10.3233/JAE-191110

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S115-S123, 2019

Authors: Seo, Kyung Sik | Park, Il Han

Article Type: Research Article

Abstract: This paper presents a method for optimizing the shape of the interface between ferromagnetic materials and air in eddy current systems through a continuum sensitivity analysis and level-set method. The continuum sensitivity formula of the eddy current system is obtained as the surface integral form in terms of the velocity field. The shape evolution of the material interface is represented by solving the level-set equation coupled with the common velocity term in the continuum sensitivity formula. The optimization method is validated by shape design examples.

Keywords: Continuum sensitivity analysis, ferromagnetic material, eddy current system, level-set method, shape design

DOI: 10.3233/JAE-191111

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S125-S132, 2019

Authors: Poline, Marie | Gerbaud, Laurent | Pouget, Julien | Chauvet, Frédéric | Castaing, Ali

Article Type: Research Article

Abstract: In France, most of the trains are electrical and some are fed by 1500 V DC voltage. When a train is traveling, the power consumption creates a voltage drop. Therefore, below a certain limit, the train has to slow down its speed. This limitation prevents the increase of traffic in some area that needs an electric reinforcement. This paper proposes to use embedded storage systems to support the voltage of the catenary. The main issue is how to size such an energy storage system? In this way, several aspects (e.g.: the energy management strategy) have to be taken into account. The …paper deals with an optimization-based sizing method for the embedded energy storage systems. The proposed method takes into account the energy management strategy in the sizing by optimization. A comparison is made between the use of batteries or supercapacitors. Show more

Keywords: Electric hybrid train, energy management, optimization, sizing, SQP

DOI: 10.3233/JAE-191112

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S133-S148, 2019

Authors: Di Barba, Paolo | Mognaschi, Maria Evelina | Rezaei, Najmeh | Lowther, David Alister | Rahman, Tanvir

Article Type: Research Article

Abstract: The main aim of this work is to determine the optimal shape design of a class of Interior Permanent-Magnet (IPM) motors for electric vehicles (EV), by means of many-objective optimisation which is an emerging area in the automated optimal design. As the case study, a 3-phase, 4-pole single-barrier IPM motor is modelled by means of using finite-element analysis. The goal is to optimise the motor’s performance in terms of a number of design criteria such as the power losses, running torque, torque ripple and material costs, by varying size and position of the permanent magnet and flux barriers.

Keywords: Finite-element analysis, interior permanent-magnet motor, many-objective optimisation, optimal shape design

DOI: 10.3233/JAE-191113

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S149-S162, 2019

Authors: Di Barba, Paolo | Dughiero, Fabrizio | Mognaschi, Maria Evelina | Sieni, Elisabetta

Article Type: Research Article

Abstract: In the paper, a multi-objective optimization of an electrode pair for electrochemotherapy is performed. The aim is to design the electrode pair geometry in order to obtain an effective treatment, which means a homogeneous and suitable electric field distribution. To solve this problem, two recently developed algorithms, M-NSGA and 𝜇-BiMO, are applied.

Keywords: Electric field, electrochemotherapy, finite-element methods, optimal design

DOI: 10.3233/JAE-191114

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S163-S172, 2019

Authors: Suzuki, Reiya | Okamoto, Yoshifumi | Wakao, Shinji

Article Type: Research Article

Abstract: Although rare earth materials are actively utilized in permanent magnets for a wide variety of applications including electric vehicles and trains, the cost of these materials is on the rise. Therefore, the synchronous reluctance motor (SynRM) which does not require permanent magnets is remarkable from the perspective of high efficiency and low cost. However, the torque characteristic of the SynRM is much lower than that of the interior permanent magnet synchronous reluctance motor (IPMSM). Then, a permanent magnet assisted synchronous reluctance motor (PMASynRM) which bonded magnet was attached to the rotor structure of SynRM has been proposed. The manufacturing cost …of the PMASynRM is lower than that of the IPMSM because a bounded magnet is utilized former. In this work, the structure of the PMASynRM has been drastically changed by topology optimization to average torque maximization and cogging torque minimization. Show more

Keywords: Average torque, cogging torque, Heaviside function, permanent magnet assisted synchronous reluctance motor, topology optimization

DOI: 10.3233/JAE-191115

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 60, no. S1, pp. S173-S181, 2019