International Journal of Applied Electromagnetics and Mechanics - Volume Pre-press, issue Pre-press

Authors: Lasek, Pawel | Habelok, Krzysztof | Stepien, Mariusz

Article Type: Research Article

Abstract: The design considerations of AC machines with windings made of high-temperature superconductors (HTS) are presented in the following paper. The considerations were narrowed to permanent-magnet excitation machines, although the results can be extrapolated to many other machine types as general guidelines. The influence of basic machine parameters and coefficients during the design of such machines are considered in order to estimate operating conditions of HTS windings. The number of poles, number of slots or slot dimensions, coil placement, and arrangement, are taken into account with the intent to fully utilize features of superconducting materials such as the capability of conducting …high current density without significant losses. The attention is placed on low power machines, below 1 kW, operating at liquid nitrogen temperature (77 K). For analysis purposes, the finite element method (FEM) is used to calculate the distribution of the magnetic field and its effect on the critical current of the HTS coil. The numerical analysis is carried out in ANSYS software. Show more

Keywords: Electric motors, high-temperature superconductors (HTS), finite element method (FEM)

DOI: 10.3233/JAE-209523

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-10, 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. Pre-press, no. Pre-press, pp. 1-14, 2020

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. Pre-press, no. Pre-press, pp. 1-1, 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. Pre-press, no. Pre-press, pp. 1-16, 2020

Authors: Bijak, Joanna

Article Type: Research Article

Abstract: To represent energy gathered in energy harvester, it is necessary to simulate movement of the energy harvester parts. The aim of this article is to present a new way to simulate movement of energy harvester in point of view of robotic approach. The power buoy is one of the best examples to show potentiality of modelling such mechanism as robotic chain. In the article two ways of buoy’s motion are presented. As a result it occurs that it is possible to use robots kinematic chain theory to present kinematic chain of energy harvesting system.

Keywords: Energy harvesting, homogenous transformation, wave energy harvester, buoy movement

DOI: 10.3233/JAE-209519

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-13, 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. Pre-press, no. Pre-press, pp. 1-11, 2020

Authors: Balavoine, François | Bauw, Grégory | Cassoret, Bertrand | Romary, Raphaël

Article Type: Research Article

Abstract: In this paper, two passive solutions for noise reduction of PWM-fed induction machines are compared: the use of LC filter connected between the PWM inverter and the machine, and a three-phase damper wound inside the machine and connected to three capacitors. Firstly, the principle, advantages and disadvantages of each solution are recalled. The equivalent electrical circuits used for the study are also explained. Then, the effectiveness of both solutions in terms of voltage harmonic reduction and harmonic flux density reduction is discussed. The weight and size criteria are also studied. Results are given for two different power ranges of induction …machines: 4 kW and 55 kW, and for two different switching frequencies of the PWM inverter: 3 kHz and 8 kHz. Show more

Keywords: Induction machine, PWM, passive, LC filter, damper, harmonics, noise

DOI: 10.3233/JAE-209513

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-11, 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. Pre-press, no. Pre-press, pp. 1-16, 2020

Authors: Güney, Ömer Faruk | Çelik, Ahmet | Bozkurt, Ahmet Fevzi | Erkan, Kadir

Article Type: Research Article

Abstract: This paper presents the electromagnetic and mechanical analysis of an axial flux permanent magnet (AFPM) motor for high speed (12000 rpm) rotor which is vertically suspended by magnetic bearings. In the analysis, a prototype AFPM motor with a double-sided rotor and a coreless stator between the rotors are considered. Firstly, electromagnetic analysis of the motor is carried out by using magnetic equivalent circuit method. Then, the rotor disk thickness is determined based on a rotor axial displacement due to the attractive force between the permanent magnets placed on opposite rotor disks. Hereafter, an analytical solution is carried out to determine the …natural frequencies of the rotor-shaft system. Finally, 3D finite element analysis (FEA) is carried out to verify the analytical results and some experimental results are given to verify the analytical and numerical results and prove the stable high-speed operation. Show more

Keywords: Electromagnetic modeling, high speed, axial flux permanent magnet motor, mechanical stress analysis, rotor vibration analysis

DOI: 10.3233/JAE-209526

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-15, 2020

Authors: Pile, Raphaël | Le Besnerais, Jean | Devillers, Emile | Degrendele, Karine

Article Type: Research Article

Abstract: The analysis of noise and vibrations under electromagnetic excitations (e-NVH) in electrical machines requires to study the stator mechanical response when excited by Maxwell stress waves. In particular, the notion of unit-wave Frequency Response Function (FRF) is often used in e-NVH simulations to model the mechanical response under electromagnetic excitations and troubleshoot noise issues. However, it is not possible to directly measure the unit-wave FRF on the electrical machines and validate the model. Instead, the Experimental Modal Analysis (EMA) is often compared to a Finite Element (FE) model in order to fit the numerical parameters (damping, boundary conditions, etc.). This paper …is presenting a complementary approach to fully numerical e-NVH analysis. It is a new hybrid methodology based on experiments for the mechanical FRF and simulation for the magnetic excitations. This is performed with dedicated experimental measurements and post-processing. The new methodology builds an equivalent unit-wave FRF from experimental measurements. The methodology is validated with the diagnose of electromagnetic noise issues for an experimental benchmark Surface Permanent Magnet Synchronous Machine (SPMSM). Show more

Keywords: Magneto-mechanical analysis, electrical machine, vibration, SPMSM, magnetic force, frequency response function

DOI: 10.3233/JAE-209511

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. Pre-press, no. Pre-press, pp. 1-12, 2020