International Journal of Applied Electromagnetics and Mechanics - Volume 57, issue S1

Article Type: Research Article

DOI: 10.3233/JAE-182294

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 1-, 2018

Authors: Barglik, Jerzy | Smagór, Adrian | Smalcerz, Albert

Article Type: Research Article

Abstract: Mathematical modeling of coupled non-linear electromagnetic, thermal and hardness fields is a sufficient tool supporting designing of various kinds of induction hardening technologies. The paper deals with the modeling of two kinds of the induction hardening of gear wheels made of 41Cr4 steel. Flux 3D for coupled electromagnetic and thermal fields computation and own procedures for hardness distribution were applied. Reasonable accordance between calculations and measurements was achieved.

Keywords: Mathematical modeling, induction hardening, coupled problem, austenitization

DOI: 10.3233/JAE-2295

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 3-12, 2018

Authors: Bauw, Grégory | Cassoret, Bertrand | Romary, Raphaël | Ninet, Olivier

Article Type: Research Article

Abstract: The flux density harmonics in the air-gap of AC machines have many origins. They generate electromotive forces and current harmonics, Maxwell forces, noise and vibrations. The principle of the presented method is to use a new auxiliary stator winding, connected to capacitors. The induced current harmonics generate flux density components in opposition to the initial ones, creating a damping effect. The study presented in this paper concerns an induction machine and particularly focus on flux density harmonics generated by slotting effects. The method allows to reduce the sound pressure level main lines of about 15 dBA. The vibrations are reduced …too. Moreover the stator current harmonics are attenuated, and the power factor is significantly improved. Show more

Keywords: Induction machine, magnetic noise, harmonics, auxiliary windings, capacitors, damper, sinusoidal

DOI: 10.3233/JAE-182296

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 13-21, 2018

Authors: Bavendiek, G. | Hameyer, K. | Filippini, M. | Alotto, P.

Article Type: Research Article

Abstract: Permanent magnets need to be magnetized with a high magnetic field for retaining their maximum polarization. If the magnetizing field is not sufficiently high, the permanent magnet will not reach its maximum energy product. Additionally, the magnet easily suffers demagnetization because the remanence and coercive field will drop in highly non-linear characteristic. This paper presents an approach which models the local magnetization of permanent magnets during and after impulse magnetization. Common hysteresis models are not capable of modelling the impact of virgin magnetization on demagnetization behavior of permanent magnets. Therefore, measurements suit as interpolation basis for the finite element method.

Keywords: Pulse magnetization, permanent magnets, virgin magnetization, demagnetization curves

DOI: 10.3233/JAE-182301

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 23-31, 2018

Authors: Brudny, Jean-François | Morganti, Fabrice | Wu, Zhenwei | Lecointe, Jean-Philippe | Komeza, Krzysztof

Article Type: Research Article

Abstract: This paper deals with the acoustic noise emitted by AC variable speed drives. It proposes an original method to reduce the noise of magnetic origin using carriers of different frequencies to control the PWM of the inverter. The method is based on an analytical model which makes it possible to determine with accuracy the parameters of the carriers. The method is applied and validated with a 15 kW induction machine.

Keywords: AC variable speed drives, PWM inverter, radial vibrations, magnetic noise

DOI: 10.3233/JAE-182311

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 33-41, 2018

Authors: Curti, M. | Jansen, J.W. | Lomonova, E.A.

Article Type: Research Article

Abstract: This paper concerns the comparison of the performance of the Spectral Element Method (SEM) and the Finite Element Method (FEM) for modeling a magnetostatic problem. The convergence of the vector magnetic potential, the magnetic flux density, and the total stored energy in the system is compared with the results of FEM. Two simulation scenarios are examined which are distinct by a large and a small rounding radius of the corner. SEM shows comparable convergence to FEM for field computations and faster convergence for energy calculations.

Keywords: Spectral element method, finite element analysis, convergence, electromechanical devices, magnetic circuit, magnetic energy

DOI: 10.3233/JAE-182297

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 43-49, 2018

Authors: Dems, Maria | Jablonski, Damian

Article Type: Research Article

Abstract: Nowadays requirements for electrical motors are getting bigger due to the new energy standards. This paper presents some new version of expert system supporting automatic design of induction motors. The inference engine was used and the .NET technology was applied. Also the correction module has some new features. Due implementation of well configured knowledge bases, it is possible to create cheaper motors with better parameters.

Keywords: Induction motors, expert system, computer-aided design

DOI: 10.3233/JAE-182298

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 51-59, 2018

Authors: Dems, Maria | Komeza, Krzysztof | Rodríguez, Hugo González

Article Type: Research Article

Abstract: This paper presents various methods of increasing the efficiency of an asynchronous motor operating over a wide frequency range. Small power motor of rated power of 1.1 kW which is typically used in industrial washing machines and in centrifuges of blood samples was considered. The paper shows that using the presented methods it is possible to upgrade the efficiency of the motor to IE3 class or even IE4 class not only for 50 Hz, but for a wider frequency range.

Keywords: Induction motors, efficiency, no-load losses

DOI: 10.3233/JAE-182308

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 61-71, 2018

Authors: Devornique, Geoffrey | Fontchastagner, Julien | Netter, Denis | Takorabet, Noureddine

Article Type: Research Article

Abstract: This paper deals with the shape optimization of the claws of a claw-pole synchronous machine. A hybrid model combining 3D FEM and Permeance Network is developed for this purpose. The optimization of the average torque with fixed stator geometry is performed using Mesh Adaptative Direct Search methods. The developed methodology has led to improve the performances of claw-pole synchronous machines used in mild-hybrid vehicles.

Keywords: Claw-pole synchronous machine, optimization, 3D finite element, coupled model, permeance network model

DOI: 10.3233/JAE-182318

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 73-81, 2018

Authors: Di Barba, Paolo | Mognaschi, Maria Evelina | Wiak, Slawomir | Przybylski, Marek | Slusarek, Barbara

Article Type: Research Article

Abstract: In the paper, the Wind Driven Optimization WDO algorithm is applied to the optimal shape design of a class of switched reluctance motors. The goal of the optimization is to identify a class of geometries which maximize the torque and simultaneously minimize the iron losses of the motor. Because of the twofold design criterion, the multi-objective version of the wind driven algorithm M-WDO is used. Results are eventually compared with those obtained by means of a standard genetic algorithm GA. For construction of optimized model of switched reluctance (SR) motor measurements of resistance and inductances vs. rotor position of commercial …motor made of steel and non-optimized model motor made of soft magnetic composite were measured. On the basis of changes in inductance, electromagnetic torques were calculated. Results of B = f(H) and iron loss measurements of soft magnetic composites made of Somaloy 700 and Somaloy 700 HR powder are also shown which will be used for construction of optimized SR model motor. Show more

Keywords: Wind-driven optimization technique, optimal design, finite element method analysis, switched reluctance motors, inductance measurements, soft magnetic composites, magnetization curve, iron loss measurements, electromagnetic torque

DOI: 10.3233/JAE-182317

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 57, no. S1, pp. 83-93, 2018