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
en-copyright= kn-copyright= en-aut-name=TakahashiNorio en-aut-sei=Takahashi en-aut-mei=Norio kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiiY. en-aut-sei=Fujii en-aut-mei=Y. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=FunakiK. en-aut-sei=Funaki en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=TakeoM. en-aut-sei=Takeo en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Kyushu University affil-num=5 en-affil= kn-affil=Kyushu University en-keyword=cable jointing kn-keyword=cable jointing en-keyword=finite element analysis kn-keyword=finite element analysis en-keyword= quenching (thermal) kn-keyword= quenching (thermal) en-keyword=skin effect kn-keyword=skin effect en-keyword=superconducting cables kn-keyword=superconducting cables END start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=5 article-no= start-page=2456 end-page=2458 dt-received= dt-revised= dt-accepted= dt-pub-year=1992 dt-pub=19929 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=An improved method for determining the DC magnetization curve using a ring specimen en-subtitle= kn-subtitle= en-abstract= kn-abstract=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
en-copyright= kn-copyright= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakahashiN. en-aut-sei=Takahashi en-aut-mei=N. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiwaraK. en-aut-sei=Fujiwara en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakanoMasanori en-aut-sei=Nakano en-aut-mei=Masanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OguraY. en-aut-sei=Ogura en-aut-mei=Y. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Okayama University en-keyword=magnetic variables measurement kn-keyword=magnetic variables measurement en-keyword=magnetisation kn-keyword=magnetisation END start-ver=1.4 cd-journal=joma no-vol=28 cd-vols= no-issue=5 article-no= start-page=2163 end-page=2165 dt-received= dt-revised= dt-accepted= dt-pub-year=1992 dt-pub=19929 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=A low loss transformer using a rotating magnetic field en-subtitle= kn-subtitle= en-abstract= kn-abstract=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
en-copyright= kn-copyright= en-aut-name=NakataTakayoshi en-aut-sei=Nakata en-aut-mei=Takayoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=TakahashiN. en-aut-sei=Takahashi en-aut-mei=N. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=FujiwaraK. en-aut-sei=Fujiwara en-aut-mei=K. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=NakanoMasanori en-aut-sei=Nakano en-aut-mei=Masanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=NagaoM. en-aut-sei=Nagao en-aut-mei=M. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= affil-num=1 en-affil= kn-affil=Okayama University affil-num=2 en-affil= kn-affil=Okayama University affil-num=3 en-affil= kn-affil=Okayama University affil-num=4 en-affil= kn-affil=Okayama University affil-num=5 en-affil= kn-affil=Okayama University en-keyword=eddy current losses kn-keyword=eddy current losses en-keyword=magnetic leakage kn-keyword=magnetic leakage en-keyword=transformers kn-keyword=transformers END