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    Superconducting switch, superconducting magnet and MRI
    1.
    发明授权
    Superconducting switch, superconducting magnet and MRI 有权
    超导开关，超导磁体和MRI

    公开(公告)号：US08855731B2

    公开(公告)日：2014-10-07

    申请号：US13540929

    申请日：2012-07-03

    申请人： Hideki Tanaka ,  Tsuyoshi Wakuda ,  Motomune Kodama ,  Akifumi Matsuda

    发明人： Hideki Tanaka ,  Tsuyoshi Wakuda ,  Motomune Kodama ,  Akifumi Matsuda

    IPC分类号： H01B12/00 ,  H01L39/20 ,  H01F6/00 ,  G01R33/3815

    CPC分类号： H01L39/20 ,  G01R33/3815 ,  H01F6/008 ,  Y10S505/86

    摘要： A superconducting switch is provided in which the structural strength of the superconducting switch is kept, and thermal efficiency between a superconducting film and a heater is high when an ON state (superconducting state) and an OFF state (normal conducting state) of the superconducting switch are switched. The superconducting switch includes a substrate, a heater for generating heat by energization, a conductive film, and a MgB2 film evaporated on the conductive film. The heater, the conductive film and the MgB2 film are laminated in this order on one surface of the substrate.

    摘要翻译： 提供超导开关，其中超导开关的结构强度被保持，并且超导开关的导通状态（超导状态）和断开状态（正常导通状态）时超导膜和加热器之间的热效率高 被切换。 超导开关包括基板，通过激励产生热的加热器，导电膜和在导电膜上蒸发的MgB 2膜。 加热器，导电膜和MgB 2膜依次层叠在基板的一个表面上。

    Persistent current switch
    2.
    发明授权
    Persistent current switch 有权
    持续电流开关

    公开(公告)号：US08138880B2

    公开(公告)日：2012-03-20

    申请号：US12182411

    申请日：2008-07-30

    申请人： George A. Keefe ,  Roger H. Koch ,  Inga Koch, legal representative ,  Frank P. Milliken, Jr. ,  James R. Rozen

    发明人： George A. Keefe ,  Roger H. Koch ,  Frank P. Milliken, Jr. ,  James R. Rozen

    IPC分类号： H01L39/18 ,  H01L39/20

    CPC分类号： H01L39/18 ,  B82Y10/00 ,  G06N99/002

    摘要： An improved persistent current switch design and method of operation are disclosed. By way of example, a persistent current switch circuit comprises a heating element and a switch element located proximate to the heating element, the switch element being substantially formed from a material (by way of example only, titanium) which exhibits a superconducting temperature value below a superconducting temperature value exhibited by a material (by way of example only, aluminum) used to provide a connection to the switch element. The switch element is responsive to the heating element such that the heating element is used to control whether or not the switch element is in a superconducting state. The switch element may also have a folded geometry. Such persistent current switches exhibit low power and low inductance.

    摘要翻译： 公开了一种改进的持续电流开关设计和操作方法。 作为示例，持续电流开关电路包括加热元件和位于加热元件附近的开关元件，开关元件基本上由表现出超导温度值的材料（仅作为示例使用钛）形成 超导温度值由用于提供与开关元件的连接的材料（仅作为示例仅使用铝）表现出来。 开关元件响应于加热元件，使得加热元件用于控制开关元件是否处于超导状态。 开关元件也可以具有折叠的几何形状。 这种持续电流开关表现出低功率和低电感。

    Superconductive switch
    3.
    发明授权
    Superconductive switch 失效
    超导开关

    公开(公告)号：US4803456A

    公开(公告)日：1989-02-07

    申请号：US136890

    申请日：1987-12-22

    申请人： Jay F. Benesch

    发明人： Jay F. Benesch

    IPC分类号： H01L39/20 ,  H01L43/00

    CPC分类号： H01L39/20

    摘要： A superconducting switch is bifilarly wound with two superconductors. The superconductors are wound around a core inside a housing and are electrically insulated from one another. One of the superconductors is radially further out than the other and a common heater element is between the superconductors to switch both superconductors substantially simultaneously between the persistent and non-persistent states.

    摘要翻译： 超导开关与两根超导体相互缠绕。 超导体围绕壳体内的芯缠绕并彼此电绝缘。 超导体中的一个比另一个径向地更远，并且在超导体之间存在普通的加热元件，以在持续状态和非持续状态之间基本上同时切换超导体。

    Switch for fine adjustment of persistent current loops in superconductive circuits
    4.
    发明授权
    Switch for fine adjustment of persistent current loops in superconductive circuits 失效
    切换超导电路中持续电流回路的微调

    公开(公告)号：US4528532A

    公开(公告)日：1985-07-09

    申请号：US553212

    申请日：1983-11-18

    申请人： Thomas A. Keim

    发明人： Thomas A. Keim

    IPC分类号： H01R39/20 ,  H01F6/00 ,  H01L39/10 ,  H01L39/16 ,  H01L39/20 ,  H01F7/22

    CPC分类号： H01L39/20 ,  H01F6/006 ,  Y10S505/851

    摘要： A small portion of a lead for a superconducting coil is made to function as a controllable resistor with a low resistance value and fast thermal response so as to be capable of rapidly being switched between the superconducting and resistive states. The device is thus capable of fine adjustment of the current flowing in a superconducting loop. The switch includes lengths of parallel conductor so that the resulting section of superconductive material is cryostable. The superconducting oil lead is disposed on a substrate so as to permit ready access for helium or other cryogenic coolant to most lead surfaces. The small mass and close contact with the coolant produce rapid turn-on and turn-off response characteristics. Furthermore, the low overall resistance causes the coil current to decay slowly, thus preventing precise control of the superconducting current.

    摘要翻译： 使超导线圈的引线的一小部分用作具有低电阻值和快速热响应的可控电阻器，以便能够在超导和电阻状态之间快速切换。 因此，器件能够精细调节在超导环路中流动的电流。 该开关包括平行导体的长度，使得所得到的超导材料部分是可低温的。 超导油引线设置在基板上，以允许氦气或其他低温冷却剂容易接近大多数引线表面。 与冷却液的小质量和紧密接触产生快速的开启和关闭响应特性。 此外，低的总电阻使得线圈电流缓慢衰减，从而阻止对超导电流的精确控制。

    Cryogenic fuse
    6.
    发明授权
    Cryogenic fuse 失效
    低温保险丝

    公开(公告)号：US3684923A

    公开(公告)日：1972-08-15

    申请号：US3684923D

    申请日：1971-08-18

    申请人： MINER S KEELER

    发明人： KEELER MINER S

    IPC分类号： H01H85/47 ,  H01L39/20 ,  H02H3/02 ,  H02H3/08

    CPC分类号： H01H85/47 ,  H01L39/20 ,  H02H3/021 ,  H02H3/08 ,  Y10S505/85

    摘要： A fuse element is manufactured of lead or other suitable material displaying superconductive properties at very low temperatures. A fuse including such an element is employed in a high voltage transmission line by serially inserting the fuse element in the line and maintaining the element in its superconductive state by using a liquified gas to cool the element during normal current levels. A sensor is provided which develops a control signal in the event excessive current levels are reached. The control signal is applied to control means which automatically vents the fuse by allowing the coolant to escape and thereby raises the temperature of the fuse such that its normal resistivity returns. The resulting I2R heat developed within the element due to the current flow therein will cause the element to immediately vaporize thereby opening the circuit. In other embodiments the control signal can be employed to provide power to a heating element mounted in thermal proximity with the fuse element to increase its temperature in the event of excessive current. Also the control signal can be employed to cause a magnetic field to be developed which causes the fuse to return to its normal resistivity. The fuse and its related circuitry can be designed to provide either a fast-blow or a slow-blow operating fuse.

    摘要翻译： 熔丝元件由在非常低的温度下显示超导性能的铅或其它合适的材料制成。 在高电压传输线路中采用包括这种元件的保险丝，通过在线路中串联插入熔丝元件并通过在正常电流水平期间使用液化气体来冷却元件，将元件保持在其超导状态。 提供一种传感器，在传感器达到过大电流的情况下，产生一个控制信号。 控制信号被施加到控制装置，其通过允许冷却剂逸出而自动排出熔断器，从而提高熔断器的温度，使得其正常电阻率恢复。 由于其中的电流流动，元件内产生的I2R热会导致元件立即蒸发，从而打开电路。 在其它实施例中，控制信号可用于向安装在熔断元件附近的加热元件提供电力，以在电流过大的情况下增加其温度。 此外，可以采用控制信号来引起磁场，使得熔丝返回到其正常电阻率。 保险丝及其相关电路可以设计为提供快速吹风或慢速熔断操作保险丝。