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Analysis on Surge Voltage in Inverter-fed Motor Using Frequency Response Analysis
M. Fujieda,Y. Takahashi,N. Kimura,T. Wakimoto,S. Nagai,N. Koshino,K. Takizawa 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, distribution of voltages between coils in inverter-fed motor and its mechanism are discussed. Insulation reliability of inverter-fed motor is one of major problems in HEV application. To ensure the reliability of insulation, enough thickness of insulation layer of coil-wire is desired to avoid partial discharge in air gap between coilwires, though the voltages between coils changes complexly due to its high frequency response. To analyze distribution of the voltages between coils, the simultaneous measurements of the voltages in various points in motor were performed. In addition, frequency response analyses of the voltages between coils were performed to understand its high frequency response. From these measurements and analysis , the fact that the LC-resonance between coil inductance and its stray capacitance causes surge voltage in motor is revealed.
Kwon, E.P.,Sato, S.,Fujieda, S.,Shinoda, K.,Kajiwara, K.,Sato, M.,Suzuki, S. Elsevier Sequoia 2013 Materials science & engineering. properties, micro Vol.570 No.-
Microscopic residual stress evolution in different austenite (γ) grains during shape memory process in an Fe@?Mn@?Si@?Cr alloy was investigated using the white X-ray microbeam diffraction technique. The use of high-energy white X-ray microbeam with small beam size allowed us to measure the microscopic residual stress in coarse γ grains with specific orientation. After tensile deformation large compressive residual stress was evolved in γ grains due to the formation of stress-induced ε martensite, but upon recovery heating it almost disappeared as a result of reverse transformation of martensite. The magnitude of compressive residual stress was higher in grains with orientations close to <144> and <233> orientations than in a grain with near <001> orientation. Analysis of the microstructure of each grain using electron backscattering diffraction suggested that the difference in the magnitude of compressive residual stress could be attributed to different martensitic transformation characteristics in the grains.
Kwon, E.P.,Sato, S.,Fujieda, S.,Shinoda, K.,Kajiwara, K.,Sato, M.,Suzuki, S. Elsevier 2017 Materials science & engineering. properties, micro Vol.705 No.-
<P><B>Abstract</B></P> <P>In this study, <I>in situ</I> white X-ray microbeam diffraction experiments were conducted to investigate the microscopic deformation behavior of a Cu-Al-Mn superelastic alloy during tensile testing. Local deformation both at a grain scale and an intragranular scale was revealed by analyzing Laue spot streaking that occurred within a grain and in some grains with different orientations. The streaking measured within a grain under tensile load showed inhomogeneous behavior because of an inhomogeneous martensitic transformation. Moreover, the effect was dependent on grain orientation. In a grain with a high Schmid factor, a large dispersion in the 2θ diffraction angle of Laue spots was observed due to significant Laue spot streaking, which can be attributed to that grain's favored martensitic transformation.</P>