International Journal of Applied Electromagnetics and Mechanics - Volume 64, issue S1

Authors: Di Barba, Paolo | Mognaschi, Maria Evelina | Wiak, Sławomir

Article Type: Editorial

DOI: 10.3233/JAE-209500

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S1-S1, 2020

Authors: Mohamodhosen, Bilquis | Tounzi, Abdelmounaïm | Gillon, Frédéric

Article Type: Research Article

Abstract: The purpose of this paper is to optimize the topology of the rotor head in a Salient Pole Synchronous Generator to maximize the magnetic flux in the stator yoke and in the air gap. The generator is modelled using FE method, and the ON-OFF method is used to manage the optimization domain. Genetic Algorithm is used to find the optimal solution for the problem. The resulting topology and convergence graphs are also presented, and the results are discussed.

Keywords: Genetic Algorithm, ON-OFF method, salient pole synchronous generator, topology optimization

DOI: 10.3233/JAE-209501

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S3-S13, 2020

Authors: Trawiński, Tomasz | Szczygieł, Marcin | Tomas, Arkadiusz

Article Type: Research Article

Abstract: During a serious underground incident the most important things are the lives of miners and the time necessary for the rescue team to find victims of the accident. The paper presents the concept of a new drilling system that uses torsional vibrations in the drilling process. In the article formulating mathematical models of a drilling rig is one of the tasks of the INDIRES (INformation Driven Incident RESponse) project implemented as a part of the European Research Fund for Coal and Steel. The INDIRES project is dedicated to the task of conducting a rescue operation after accidents in mines.

Keywords: Electromagnetic field, finite element method FEM, torque generator, mathematical modelling

DOI: 10.3233/JAE-209502

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S15-S28, 2020

Authors: Chaithongsuk, Sisuda | Chaiworapuek, Weerachai | Takorabet, Noureddine | Rahouadj, Rachid

Article Type: Research Article

Abstract: In order to analyze and design the Interior Permanent Magnet Synchronous Motor (IPMSM), the parameters must be defined according to characteristics of the motor. To obtain a good motor, the decrease of leakage flux is done by reduction of mechanical stresses and increase of the magnetic flux density. The magnetic flux distribution in the air gap is first analyzed. Then, the rotor is designed by using a specific mathematical model. Two topologies based on placing of permanent magnet into the rotor, which is placing in parallel shape and V-shape, are analyzed and designed. The mechanical stresses and rotor strains occurring …during the rotation at high speed are studied. Show more

Keywords: Magnetic flux density, mechanical stresses, deformations, IPMSM, FEA

DOI: 10.3233/JAE-209503

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S29-S39, 2020

Authors: Orosz, Tamás | Karban, Pavel | Pánek, David | Doležel, Ivo

Article Type: Research Article

Abstract: Cost optimization of power transformers is a complex engineering task. The design engineers have to solve this multidisciplinary, non-linear optimization problem in a very short-time. Due to the importance of the topic, numerous optimization methods have been developed in the industry to solve this problem. These methods generally use different, simplified two-winding transformer models, where the windings are generally modeled by their copper filling factors. These models cannot consider the eddy current losses and the temperature gradients of the windings properly, because the calculation of these quantities needs knowledge of the conductor dimensions. This paper proposes a novel method, which …uses a general geometric programming search based sub-problem to determine the optimal conductor dimensions for the optimal winding shape. The proposed method considers the temperature gradients of the windings and uses FEM to determine the eddy losses of the windings. The whole optimization process is made by an evolutionary algorithm (NSGA-II)-based search. The paper presents this novel transformer optimization methodology and then illustrates it with a practical example. Show more

Keywords: Optimization, evolutionary computation, FEA, power transformers

DOI: 10.3233/JAE-209504

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S41-S49, 2020

Authors: Bastiaens, Koen | Krop, Dave C.J. | Curti, Mitrofan | Jumayev, Sultan | Lomonova, Elena A.

Article Type: Research Article

Abstract: This paper concerns the design of a high-frequency GaN-based rotating transformer confined by conductive materials. The design approach combines the high-order spectral element method for the magnetic modeling, an electronic circuit model, and the finite element method for the thermal modeling. The objective of the design analysis is to minimize the ratio of core inertia to efficiency. Two different transformer topologies are considered, in which the power is either transferred in the axial or radial direction. The resulting designs are compared in terms of efficiency, core inertia, and transferred power. The radial design shows the best performance within the optimization …problem. Show more

Keywords: Design optimization, eddy currents, finite element analysis, gradient methods, inductive power transmission, numerical models, spectral element method

DOI: 10.3233/JAE-209505

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S51-S64, 2020

Authors: Dems, Maria | Komęza, Krzysztof | Majer, Krzysztof

Article Type: Research Article

Abstract: Reducing motor losses is very important in connection with raising the requirements set by international regulations on reducing electricity consumption. As induction motors are increasingly powered by high-frequency voltage, core losses starting to play a dominant role in motor loss balance. The presented paper shows how to calculate the basic and additional losses in the core of the induction motor, generated by the reluctance and slot harmonics of the magnetic field in the motor and by the higher harmonics produced by the inverter, using analytical and field-circuit methods. The results for motor operation at frequencies of supply voltage 10, 20 …and 350 Hz were presented and compared with the results of measurements. The main achievement is the statement that losses in the core of the motor fed from the inverter should be calculated as the sum of losses generated by individual harmonics both in the motor and generated by the inverter. Show more

Keywords: Induction motor, core losses, additional losses, inverter power supply

DOI: 10.3233/JAE-209506

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S65-S82, 2020

Authors: Komęza, Krzysztof | Dems, Maria | Lecointe, Jean-Philippe

Article Type: Research Article

Abstract: Reducing induction motor losses is very important because of the fulfilment of increasingly stringent requirements set by international regulations for reducing electricity consumption. Since core losses begin to dominate in motors operating at higher frequencies the exact calculation becomes more and more important. The common view is that losses due to higher harmonics caused by stator and rotor slotting constitute an important part of losses in the motor core. Proper calculation of the core losses requires inclusion both hysteresis and eddy current phenomena. For the hysteresis simulation, method included in package Opera 3D has been used. Using that model it …was possible to investigate flux behavior at high frequency like as for higher harmonics field. Next part is focused on practical determining of proper method for higher harmonics losses limitation. Show more

Keywords: Laminated core, hysteresis, eddy current, induction motor, core losses

DOI: 10.3233/JAE-209507

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S83-S98, 2020

Authors: Marault, Jérôme | Gillon, Frédéric | Hecquet, Michel | Tounzi, Abdelmounaïm

Article Type: Research Article

Abstract: The winding design of an electrical machine is an important task in the whole design process. This leads, for a part, to the magneto motive force which is one of the main quantities to manage for electrical machine performances. Indeed, the latter is directly linked to that of the air gap magnetic flux density and thus to the torque ripples, vibration and then noise. This paper proposes to reduce the MMF harmonic content by means of optimization process using mono-objective or multi-objective algorithms with discrete and continuous variables. For this aim, optimization algorithm is coupled with an analytical tool which …enables calculating quickly the MMF harmonic content from winding parameters. A winding optimization of three different windings with the same number of pole pairs is proposed to show the suitability of this process. Show more

Keywords: MMF harmonic content, mono-objective, multi-objective, optimization algorithm, new winding pattern, winding design

DOI: 10.3233/JAE-209508

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S99-S114, 2020

Authors: Witczak, Pawel | Kubiak, Witold | Szulakowski, Jacek

Article Type: Research Article

Abstract: The paper deals with analysis of vibrational behavior of induction motor using the combined approach linking the finite elements method (FEM) applied to modelling of magnetic and mechanical phenomena in the motor with its modal description in spectral domain. Results of investigations presented in this paper proved that relatively small rotor axis misalignment against stator leads to visible vibration if forces resulted from this effect have frequency close to rotor bending resonance. Paper contains a rigorous description of all steps in analysis with a special attention paid to details of numerical approach both in FEM and in spectral consideration. Results …of theoretical investigations were confirmed by measurements. Show more

Keywords: Induction motor, vibration, finite elements, spectral analysis

DOI: 10.3233/JAE-209509

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 64, no. S1, pp. S115-S130, 2020