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A study on electromagnetic and mechanical characteristics of the field coil in HTS motor
Kim, S.B.,Kadota, T.,Joo, J.H.,Sano, H.,Murase, S.,Lee, S.H.,Hong, J.P.,Kim, H.M.,Kwon, Y.K.,Jo, Y.S. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.20
High temperature superconducting (HTS) motors electromagnetically consist of a rotator wound with HTS wires and an armature with conventional copper wires like Litz wire. The HTS rotor windings, as field coils, consist of a straight part and an end-ring part. Because a major rotation torque is induced by an interaction between magnetic fields and current-carrying conductors in the straight part, most of mechanical stresses in the motor occur at the straight part. An end-ring is placed in the edge of the straight part and used to connect to each adjacent straight-part coils. The magnetic fields by coil currents concentrate on the end-ring part, therefore, it is expected that the critical current of the entire coil, straight and end-ring, can be determined by the magnitude of the field in the end-ring. This paper deals with the overall J<SUB>c</SUB> degradation in the end-ring part by self-field generated from the coil. In addition to electromagnetic analyses, we have performed a numerical analysis in order to evaluate mechanical stresses in the straight part of field coil by armature reaction on steady-state operation. The analytical results will be presented in this paper.
Kim, S.-B,Sano, H,Joo, J.-H,Kadota, T,Murase, S,Kim, H.-M,Jo, Y.-S,Kwon, Y.-K IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>Recently, the superconducting devices using cryogenic and superconducting technologies were widespread in the field of electric power. The 2G wires with YBCO superconducting layer, metal substrate and stabilizer layer are expected to be used in future superconducting applications, because it has high J<SUP>c</SUP> properties in high temperature and high magnetic fields. In order to operate safely at high transport currents, the thermal stability of the wounding wire should be addressed in terms of detection and protection against the quench. On the other hand, the understanding of the 3-dimensional normal zone expansion during a quench is very important to design the superconducting devices such as magnets and cables. This paper presents the results of an experimental study for normal zone propagation properties in the longitudinal and transverse directions using the pancake coil wound with 2G wires which have Cu and SUS stabilizers under the cryocooler cooling. And the minimum quench energy (MQE) of the pancake coils wound with two different kinds of stabilizers as functions of operating temperature and transport current will be described.</P>
Quench protection technique for HTS coils with electronic workbench
Joo, J.H.,Kim, S.B.,Kadota, T.,Sano, H.,Murase, S.,Kim, H.M.,Kwon, Y.K.,Jo, Y.S. North-Holland 2010 Physica. C, Superconductivity Vol.470 No.20
The stability and the protection of superconducting applications are very important issues. High temperature superconductor (HTS) is stable than low temperature superconductor (LTS). However, due to the high stability of HTS, HTS coils have complicate behaviors of normal transition - such as a recovery into the superconducting state or thermal runaway - which is determined by the magnitude of disturbance, coil size, the structure of winding wire and cooling condition. In this paper, we propose the quench protection system based on the active power method which can detect the quench by measuring the generating instantaneous active power in HTS coils. And the quench detection circuit adopted a software circuit by LabVIEW which was added a new quench protection technique to the circuit in order to improve its detection performance. Furthermore, it can monitor interior states of HTS coils with acquiring the only coil voltages in real time. To confirm the validity of the suggested technique, the experiments were performed with the hardware circuit for quench detection simultaneously. The experimental results are presented and discussed in this paper.
The Release of Hepatic Triglyceride Lipase from Rat Monolayered Hepatocytes in Primary Culture
윤대헌(Tai Heon Yoon),Yamada N(Nobuhiro Yamada),Ishibashi S(Shun Ishibashi),Shimano H(Hitoshi Shimano),Gotohda T(Takanari Gotohda),Harada K(Kenji Harada),OAkanuma Y(Yasuo Akanuma),Murase T(Toshio Murase) 한국식품영양과학회 1991 한국식품영양과학회지 Vol.20 No.1
쥐간세포 배양시 간트리글리세리드 lipase의 유리 및 호르몬 조절에 관하여 연구하였다. 배양 2일째 헤파린 첨가구 배양액에 유리된 lipase 활성은 24시간 동안 계속 증가하였다. 반면에 헤파린 무첨가의 lipase활성은 헤파린 첨가가우에 비하여 10%에 지나지 않았다. 간세포를 anti-hepatic triglyceride lipase IgG와 배양시 lipase 활성이 92%까지 저해되었다. Monensin 첨가시 lipase활성 저해는 61%였다. 인슐린은 lipase활성을 20% 상승시켰으며 dexamethasone은 44% 저해시켰다. 이상의 결과로 미루어 보아 간트리글리세리드 lipase는 헤파린 존재하에 분비 및 유리되며 그 분비는 호르몬에 의해 조절됨을 시사한다. The release of hepatic triglyceride lipase from cultured rat hepatocytes and its hormonal regulation were studied. The activity of lipase released into the medium in the presence of heparin was increasing during 24 hours on the 2nd day of culture, while this was 10% in the absence of heparin as compared with the lipase activity in the presense of heparin. When hepatocytes were cultured with anti-hepatic triglyceride lipase IgG, the lipase activity was suppressed by 92%. The results suggest that the enzyme released into culture medium is identical to hepatic triglyceride lipase which can be released only in the presence of heparin, the model of release being similar to that of lipoprotein lipase from adipocytes. The addition of monensin to the medium resulted in the inhibition of lipase secretion by 61%. Insulin enhanced lipase activity only 20%, whereas dexamethasone suppressed the activity by 44%. These data indicated that hepatic triglyceride lipase is secreted and released from hepatocytes in the presence of heparin and its secretion is regulated by hormones.
Study on Quench Protection Method With Regards to Normal Transition Behavior for HTS Coil
Joo, J.-H,Sano, H,Kadota, T,Kim, S.-B,Murase, S,Kwon, Y.-K,Kim, H.-M,Jo, Y.-S IEEE 2010 IEEE transactions on applied superconductivity Vol.20 No.3
<P>This paper presents the quench detection method with using normal transition behavior for HTS coil. If the HTS coil starts to propagate a normal zone by an initial quench, it will be recovered the superconducting state or runaway thermally. These behaviors were mainly determined by variety parameters like the magnitude of a disturbance, HTS coil size, the structure of winding wire and cooling condition. However, the first step of detection or protection for coils should be started from detecting the presence of a non-recovering normal zone. This paper classifies the initial quench behaviors of HTS wires or coils as a model of 3-type tendencies, and suggests suitable detection techniques for each tendency with using the end-to-end voltage of coil. In additional, this method is able to detect a quench without a decisive criterion used at other quench detection methods. In order to confirm the validity of the method, we used the HTS sample coil wound with YBCO tapes. This paper presents these results and the quench protection properties with fabricated detection method.</P>