Operating at High TemperaturesContribution to the Magneto-Thermal Modeling of SRM Operating at High Temperatures

In this paper, we present a simplified magneto-thermal modeling strategy for switched reluctance electrical machines (SRM) operating at high temperatures. In addition to the magnetic non-linearity, the variations of the electromagnetic and thermal properties of materials with the temperature are taken also into account. The rapidity of the proposed approach makes it compatible with a CAD approach.

Structural and Optical Properties in thin-films of (GeGa2)100-x(Sb2Ga3)x (x = 15, 30, 45, 60) Alloys

Investigation of structural morphology and optical parameters of non-oxide (GeGa2)100−x (Sb2Ga3)x (x = 15, 30, 45, 60) glass alloys have been studied in the present paper. Thin films of prepared bulk samples by melt quenching technique were obtained using thermal evaporation method. XRD, DSC and SEM were used to investigate the structural morphology and thermal properties of materials. The linear and non-linear optical properties of prepared samples have been studied for optoelectronic applications. FTIR transmittance spectra defines the impurities present in the prepared glassy alloys. It was observed that energy bandgap (Eg) obtain by Tauc’s plot varies from 2.9 eV to 1.25 eV. The calculated value of k, Eg decreases whereas the α and Urbach energy increases with increasing doping Sb concentration. The decrease in energy bandgap is discussed on the basis of Mott and Davis model.

The Analysis of Properties of Thermal Sensitive Elements in Measuring Devices for Thermal Properties of Materials

The analysis of properties of thermosensitive elements used in devices for monitoring the temperature and thermophysical properties of the medium and materials is carried out. Thermal converters made of various materials are considered: metals, semiconductors, oxides. The sensitivity to infrared radiation of the considered elements is analyzed. The range of measured temperatures and the linearity of the output characteristics of the converters are investigated. A conclusion is made about the purposefulness of using one or another type of thermosensitive elements.