Acta Medica Okayama2851992Study on cause of quenching at the joint between multifilamentary superconducting cable and normal conducting cable using 3D FEM28262828ENNorioTakahashiTakayoshiNakataY.FujiiK.FunakiM.Takeo<p>Investigates the cause of quenching at the joint between a multifilamentary superconducting cable and a normal conducting cable. The 3D current distribution is analyzed. It is found that the cause of quenching is the extreme concentration of current in the joint due to the pronounced skin effect at liquid helium temperature. The mechanism of the concentration of current which is affected by the twist pitch and skin depth is also clarified quantitatively by numerical analysis</p>
No potential conflict of interest relevant to this article was reported.Acta Medica Okayama2851992An improved method for determining the DC magnetization curve using a ring specimen24562458ENTakayoshiNakataN.TakahashiK.FujiwaraMasanoriNakanoY.Ogura<p>When the DC magnetization curve (B-H) of nonoriented material is measured in a ring specimen, there is an intrinsic error due to the assumption that the mean magnetic path length is equal to the mean geometric path length. A novel method for determining the B-H curve accurately is proposed. The validity of the method is verified by experiments</p>
No potential conflict of interest relevant to this article was reported.Acta Medica Okayama2851992A low loss transformer using a rotating magnetic field21632165ENTakayoshiNakataN.TakahashiK.FujiwaraMasanoriNakanoM.Nagao<p>A type of transformer with reduced iron loss, which is excited by a semirotating magnetic field, has been investigated. Factors (method of excitation and slits in the core) affecting iron losses are examined. The iron loss of this type of transformer can be reduced below the material loss as measured for normal AC excitation by introducing a slit which cuts the eddy current path, and by improving the method of excitation</p>
No potential conflict of interest relevant to this article was reported.