International Journal of Applied Electromagnetics and Mechanics - Volume 63, issue 4

Authors: Aydoun, Racha | Parent, Guillaume | Lecointe, Jean-Philippe | Tounzi, Abdelmounaïm

Article Type: Research Article

Abstract: This paper deals with the development of a simplified numerical model with the aim of assessing the impact of using grain-oriented electrical steel (GOES) in switched reluctance machine (SRM) on its performance. Different grades of steel are studied to firstly analyze their impact on the inductance and the electromagnetic torque change. Then, both the simplified model and the steel grades helped determine the level of contribution of anisotropy and high permeability individually. In this paper, the impact on electromagnetic torque is evaluated along with a local analyses of the flux lines distribution and the numerical model allows to draw conclusions …on the device performance when anisotropy is introduced. Although the GOES numerical model used for finite elements simulations is not a fully developed model, it is accurate enough for our study. The originality of this paper lies in the fact that the developed model is relatively simple and accurate enough to investigate all the electromagnetic phenomena and draw conclusions which can be applicable to a more complex and time-consuming electromagnetic device. The second original aspect is the introduction of GOES in an axial flux SRM (AFSRM). Show more

Keywords: Anisotropy, axial flux switched reluctance machine, grain oriented electrical steel, axial flux, electromagnetic torque, inductance

DOI: 10.3233/JAE-209205

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 4, pp. 691-703, 2020

Authors: Koteras, Dariusz | Tomczuk, Bronislaw

Article Type: Research Article

Abstract: The comparison of three field methods for homogenization of the laminated cores has been presented in this work. As a result, the equivalent electrical conductivity and magnetic permeability for the geometry of the core entire body were obtained for magnetic field 3D modelling. The first method is an iterative homogenization method (IHM) connected with the field solution, whereas the two others are based on analytical expressions arising from the Maxwell’s equations. For 3D field solution, Finite Element numerical model including eddy currents under various frequency values was used in IHM. The model is based on a combination of the …total and the reduced magnetic potentials. For comparison to our IHM, the two analytical approaches for core homogenization were used, as well. To calculate the stray losses in the homogenized laminated C-core these three approaches have been executed, as a case study. Applying suitable simplifications, according the methods of analytical homogenization, between the analytically calculated and measured values of the core losses high differences have been obtained. For the cores from amorphous strip, the analytical methods are inappropriate and our method, though iteratively implicit, gives significantly better equivalent parameters for the laminated C-core. Show more

Keywords: Implicit iterative method, equivalent conductivity, eddy current losses, homogenization methods

DOI: 10.3233/JAE-209208

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 4, pp. 705-714, 2020

Authors: Roger, Daniel | Vélu, Gabriel | Ait-Amar, Sonia | Babicz, Sylvain

Article Type: Research Article

Abstract: The paper proposes a comparative approach of two wire technologies for making compact coils able to operate in high temperature (HT°) machines. The first technology is based on ceramic-coated round wire associated with a HT° cement. The second one uses anodized aluminum strips. The advantages and drawbacks of the two technologies are compared, considering the machine global performances at high temperatures.

Keywords: High temperature machine, inorganic insulation, thermal equivalent circuits

DOI: 10.3233/JAE-209209

Citation: International Journal of Applied Electromagnetics and Mechanics, vol. 63, no. 4, pp. 715-724, 2020