Papers by Keyword: Magnetic Losses

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Authors: I. Kathir, S. Balakrishnan, B.V. Manikandan
Abstract: This paper proposes a technique for the identification of defects of three-phase squirrel cage induction motors. Simulations were performed using ANSYS finite element software package to obtain the flux density waveform in the air gap. Broken rotor bar fault was simulated by breaking rotor bars to see how the flux density is affected. In this paper, a new approach for the identification of broken rotor bar based on the calculation of high-frequency losses in induction motors is presented. The approach presented in this paper requires little time for loss calculation and fault identification.
Authors: Yu.N. Dragoshanskii, V.V. Shulika, A.P. Potapov, V.F. Tiunov
Abstract: The paper deals with the domain structure and electromagnetic characteristics of soft magnetic iron-based alloys, which are formed by the impact of thermomagnetic treatment (TMT) - cooling of the material in the presence of a magnetic field. The effect of reducing the specific magnetic loss in materials, using a constant or alternating (different frequency) magnetic field is determined. It is shown that the minimum magnetic losses in the materials are obtained after TMT in an alternating magnetic field at high (~ 80 kHz) frequencies. This shows up the perspectives of TMT of soft magnets.
Authors: Kyoung Hun Jung, Jang Young Choi
Abstract: This paper deals with experimental verification and performance analysis of permanent magnet synchronous generator (PMSG) for wind power generation considering magnetic losses using d-q axis model. The d-q voltage equation of the PMSG is derived. The equations for losses such as copper loss, core loss and mechanical loss are also derived. Finally, by implementing dynamic simulation block diagram for the prediction of generating performance considering losses using MATLAB/SIMULINK, the generating performances of the PMSG are predicted under various speeds and loads. The predicted results are validated extensively by finite element (FE) analyses and measurements.
Authors: Nicolas Meyer, Yves Bréchet, Muriel Véron, Marc Mantel, Pierre Emmanuel Dubois, Oliver Geoffroy
Abstract: Softening kinetics of two 17% chromium (Cr) stainless steel grades that differ in niobium (Nb) content are compared. In the experiments, we observed that a low Nb stabilization makes recrystallization nucleation much faster and prevents incomplete recrystallization. A qualitative interpretation, based on interaction with precipitates, is proposed and explains the main features of the softening kinetics as well as the microstructures obtained. For the Nb stabilized grade, magnetic losses were measured in the deformed state and after recrystallization. Above a specific magnetizing frequency, the deformed state led to smaller losses than the recrystallized state. These results are believed to be attributed to a grain size effect.
Authors: Nadezhda A. Skulkina, Oleg A. Ivanov, Elena A. Stepanova, Irina O. Pavlova
Abstract: The physical reasons of influence of heat treatment in vacuum and air on magnetic properties of ribbon’s of amorphous soft magnetic iron-based alloys were investigated. It is shown that the heat treatment in the air contributes to retrieve the status of a material with lower specific magnetic losses. The reason for this is the formation during annealing of increased concentration along the axis of the ribbon of embedded in the surface atoms of hydrogen and oxygen. In this direction induced pseudo-uniaxial tensile stress, contributing to the reduction of the period of the domain structure and the speed of domain walls motion in the process of magnetization reversal.
Authors: Fernando José Gomes Landgraf, J.C. Teixeira, M. Emura, Marcos Flavio de Campos, C.S. Muranaka
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