Measurement of magnetic properties of soft magnetic composite material (SOMALOY 700) by using 3-D magnetic tester

© 2016 The Institute of Electrical Engineers of Japan. Core loss for rotating electrical machine can be predicted by identifying the magnetic properties of the particular magnetic material. The magnetic properties should be properly measured since there are some variations of vector flux density in the rotating machine. In this paper, a kind of soft magnetic composite material, SOMALOY 700, has been measured under one axis flux density penetration by using a 3-D magnetic tester. The LabVIEW has been used to measure the induced voltages of B (magnetic flux density) and H (magnetic field strength) sensing coils. The voltages are used in obtaining the magnetic properties of the sample such as B, H, hysteresis loop and core loss by using the Mathcad software

Core loss measurement of Somaloy 700 material under round Loci of magnetic flux density

© 2018 Authors. The magnetic properties of SOMALOY 700 material are aggressively studied by some researchers in predicting the production of total core loss during the magnetization process of that particular material. Core loss is resulted due to the alternating and rotating magnetic fields in a core material. The magnetic properties of SOMALOY 700 material is studied in this paper since it offers the low core loss during the operation. 2-D measurement were conducted by controlling the fluxes to be circular with the help of LabVIEW while the core loss calculations were calculated by MathCAD. The performance of SOMALOY 700 material at different frequencies were compared. The finding indicates that the magnetization at 1000 Hz contributes higher core loss compared to the magnetization at 500 Hz and 50 Hz. The details of SOMALOY 700 material provide good information to practitioners in designing electrical machine at different variation of frequencies

A review on 3-D magnetic property testing system for measuring rotational core loss of soft magnetic materials

© 2015 IEEE. In today's world, the development of electromagnetic devices require the magnetic cores to be operated at higher frequency. Soft magnetic composite (SMC) materials are suitable for these applications because of their properties like high electrical resistivity which leads to the low eddy current loss, and 3-D magnetic isotropy which provides great design flexibility of various electromagnetic devices. On top of that, the prediction of core losses is very important in obtaining the optimum design of the electrical machines which is always aiming for high efficiency. This paper reviews the development of 3-D magnetic property testing system or 3-D tester in studying the rotational core loss of SMC materials based on the previous researches in the last decade

Governance of the Sustainable Public Palm Oil Replanting Program (PSR) in Riau Province

The concept of good governance is a reference concept that is recognized as being a good manager of government activities. Governance is governance, administration, or management which can be interpreted as power that is no longer owned or becomes a matter for the government. The purpose of this study was to find out how the governance of the sustainable PSR program in Riau Province is. The research method used is qualitative research with a case study approach. The results of this study show that the governance of the sustainable PSR program in Riau Province has been going well but still has some challenges in its distribution and distribution. The challenges identified in this research are the 2019 Coronavirus disease, human resources, and the increasing price of palm oil

Chain elongation suppression of cyclic block copolymers in lamellar microphase-separated bulk

Chain elongation suppression of cyclic block copolymers in microphase-separated bulk was determined quantitatively. Solvent-cast and annealed films are confirmed to show alternating lamellar structure and their microdomain spacing D increases with increasing total molecular weight M according to the relationship Dproportional toM(0.59), which agrees quite consistently with the theoretically predicted power law, i.e., Dproportional toM(3/5). This result is in contrast to the well-established issue for linear block copolymers, where the relationship Dproportional toM(2/3) has been confirmed to hold both experimentally and theoretically. This means that chain elongation of each component block is suppressed considerably, owing to their looped conformation in strongly segregated bulk. (C) 2004 American Institute of Physics.</p

On the observed annual gravity variation and the effect of sea surface height variations

Based on two datasets of sea surface height (SSH) variations, the Parallel Ocean Climate Model (POCM) [J. Geophys. Res. 101 (C10) (1996) 25779] and the TOPEX/POSEIDON (T/P) altimeter, we have analyzed the effect of SSH variations on gravity observations

Star formation histories and evolution of 35 brightest E+A galaxies from SDSS DR5

We pick out the 35 brightest galaxies from Goto's E+A galaxies catalogue which are selected from the Sloan Digital Sky Survey Data Release 5. The spectra of E+As are prominently characterized by the strong Balmer absorption lines but little [Oii] or H_alpha emission lines. In this work we study the stellar populations of the sample galaxies by fitting their spectra using ULySS, which is a robust full spectrum fitting method. We fit each of the sample with 1-population (a single stellar population-a SSP) and 3-population (3 SSPs) models, separately. By 1-population fits, we obtain SSP-equivalent ages and metallicities which correspond to the `luminosity-weighted' averages. By 3-population fits, we divide components into three groups in age (old stellar population-OSP, intermediate-age stellar population-ISP, and young stellar population-YSP), and then get the optimal age, metallicity and population fractions in both mass and light for OSP, ISP and YSP. During the fits, both Pegase.HR/Elodie3.1 and Vazdekis/Miles are used as two independent population models. The two models result in generally consistent conclusions as follows: for all the sample galaxies, YSPs (< 1Gyr) make important contributions to the light. However, the dominant contributors to mass are OSPs. We also reconstruct the smoothing star formation histories (SFHs) by giving star formation rate (SFR) versus evolutionary age. In addition, we fit the E+A sample and 34 randomly selected elliptical galaxies with 2-population (2 SSPs) model. We obtain the equivalent age of old components for each of the E+A sample and elliptical galaxies. By comparison, the old components of E+As are statistically much younger than those of ellipticals. From the standpoint of the stellar population age, this probably provides an evidence for the proposed evolutionary link from E+As to early-types (E/S0s).Comment: 16 pages, 9 figures, Accepted for publication on MNRA