公开(公告)号：EP1036541A1

公开(公告)日：2000-09-20

申请号：EP98956014.9

申请日：1998-12-01

申请人： Hitachi Medical Corporation ,  Hitachi, Ltd.

发明人： KAKUGAWA, Shigeru ,  KITAMURA, Shouji ,  HARA, Nobuhiro ,  KOMURA, Akiyoshi ,  HINO, Noriaki ,  KAWANO, Hajime ,  HONMEI, Takao ,  TAKESHIMA, Hirotaka ,  YATSUO, Takeshi ,  TAZAKI, Hiroshi

IPC分类号： A61B5/055 ,  G01R33/381

CPC分类号： G01R33/3806 ,  G01R33/381 ,  G01R33/3815

摘要： A magnet device which includes two sets of static magnetic field generation sources, each being constituted by current carrying means disposed concentrically in order to generate a uniform magnetic field directing in a first direction being provided with at least four current carrying means, and in which when assuming a crossing point of a first axis which is in parallel with the first direction and passes substantially the center of the current carrying means and a second axis which crosses the first axis orthogonally and locates at substantially the equal distance from the two sets of the static magnetic field generation sources as a first point and further assuming a first straight line contained on a first plane defined by the first axis, the second axis and the first point and passing through the first point, the current carrying means are disposed in such a manner that, when geometrical centers of cross sections of the current carrying means on the first plane are projected on the first straight line, the current carrying direction of the current carrying means at the respective corresponding projections of each of the static magnetic field generation sources aligns alternatively in positive and negative direction on the first straight line, thereby, an open space feeling and accessibility to an object to be inspected are improved in an MRI device.

公开(公告)号：EP0807940A1

公开(公告)日：1997-11-19

申请号：EP96939331.3

申请日：1996-11-29

申请人： HITACHI MEDICAL CORPORATION

发明人： TAKESHIMA, Hirotaka Hitachi Medical Corporation ,  KAWANO, Hajime Hitachi Medical Corporation ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： H01F7/22

CPC分类号： G01R33/3875 ,  G01R33/3806 ,  G01R33/3815 ,  G01R33/421

摘要： The present invention relates to techniques for enlarging an opening, which accommodates a subject, in a superconducting magnet apparatus for use in MRI system, so as to prevent the subject from feeling claustrophobic, and for realizing low magnetic field leakage therefrom, and for reducing the weight thereof, and for realizing a large high magnetic field strength uniform magnetic field region.
Static magnetic field generating sources of the superconducting magnet apparatus are constituted by two sets of superconducting coils, the respective sets of which are placed in such a manner as to face each other across a uniform magnetic field generating region. Each of the sets of superconducting coils consists of a main coil for feeding electric current in a specific direction, a bucking coil for feeding electric current in a direction opposite to the direction of the electric current flow passing through the main coil, and a coil for correcting magnetic homogeneity. The diameter of the aforementioned main coil is set as being nearly equal to that of the aforesaid bucking coil. Further, the diameter of the coil for correcting the magnetic homogeneity is set as being less than that of the main coil. Moreover, an amount of electric current flowing through the coil for correcting the magnetic homogeneity is set as being less than that of electric current passing through the main coil. Furthermore, the distance between the two main coils facing each other is set as being shorter than that between the two bucking coils.

摘要翻译： 本发明涉及在用于MRI系统的超导磁体装置中扩大容纳被摄体的开口的技术，以防止受试者感到幽闭恐惧，并且为了实现低磁场泄漏，并且为了减少 并且用于实现大的高磁场强度均匀的磁场区域。 超导磁体装置的静磁场产生源由两组超导线圈构成，它们各自以跨越均匀磁场产生区域彼此相对的方式设置。 每组超导线圈由用于沿特定方向馈送电流的主线圈组成，用于在与通过主线圈的电流流动方向相反的方向上馈送电流的降压线圈和用于 矫正磁同质性。 上述主线圈的直径被设定为与前述的搭扣线圈大致相等。 此外，用于校正磁均匀性的线圈的直径设定为小于主线圈的直径。 此外，流过用于校正磁性均匀性的线圈的电流量被设定为小于通过主线圈的电流的电流量。 此外，彼此面对的两个主线圈之间的距离被设定为比两个起伏线圈之间的距离短。

公开(公告)号：EP0807940B1

公开(公告)日：2007-01-17

申请号：EP96939331.3

申请日：1996-11-29

申请人： HITACHI MEDICAL CORPORATION

发明人： TAKESHIMA, Hirotaka Hitachi Medical Corporation ,  KAWANO, Hajime Hitachi Medical Corporation ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： H01F6/06 ,  G01R33/38 ,  G01R33/3815 ,  G01R33/421 ,  G01R33/3875 ,  G01N24/08

CPC分类号： G01R33/3875 ,  G01R33/3806 ,  G01R33/3815 ,  G01R33/421

摘要： A superconducting magnet device for an MRI apparatus which has a wide opening where the subject lies so as to eliminate the feeling of being in an enclosed space. The magnetic field leakage, the weight of the device is light and a uniform strong magnetic field is created over a wide area. The static magnetic field generating source of the superconducting magnet device is constituted of two opposed sets of superconducting coil groups positioned on both sides of a uniform magnetic field generating area. Each coil group is composed of a main coil which makes an electric current to flow in a fixed direction, a compensation coil which makes another electic current to flow in the direction opposite to that of the electric current generated by the main coil, and a correction coil which corrects the uniformity of the magnetic field. The diameters of the main and compensation coils are nearly equal to each other and the diameters of the correction coil is smaller than that of the main coil. The quantity of the electric current generated by the correction coil is smaller than that of the electric current generated by the main coil. The distance between the two main coils is shorter than that between the two compensation coils.

公开(公告)号：EP0828264B1

公开(公告)日：2003-06-18

申请号：EP97907429.1

申请日：1997-03-21

申请人： Hitachi Medical Corporation

发明人： HONMEI, Takao, Hitachi Medical ,  TAKESHIMA, Hirotaka, Hitachi Medical ,  KAWANO, Hajime, Hitachi Medical ,  TAKUMA, Yutaka, Hitachi Medical ,  KOTABE, Munenori, Hitachi Medical ,  MAKI, Naoki ,  HARA, Nobuhiro ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： H01F6/00

CPC分类号： H01F6/00 ,  G01R33/3815

摘要： A small-sized highly precise superconducting magnet device such that the magnetic flux changes little with the time and quenching hardly occurs. A magnetization adjusting method for uniformly magnetizing such a magnet device is also disclosed. The superconducting magnet device has a coolant container, a permanent current retaining medium which is provided in the container and generates a magnetic flux in a uniform magnetic field region (FOV), a static magnetic field generating means composed of a plurality of cylindrical bodies made up of superconducting composite plates, a cylindrical body supporting base which supports the cylindrical bodies, and temperature adjusting elements (not shown in Fig. 67) buried in the cylindrical bodies. The static magnetic field generating means is magnetized by induction magnetization and the magnetization value is adjusted by controlling the temperatures of the cylindrical bodies by means of the temperature adjusting elements.

公开(公告)号：EP0828264A1

公开(公告)日：1998-03-11

申请号：EP97907429.1

申请日：1997-03-21

申请人： HITACHI MEDICAL CORPORATION

发明人： HONMEI, Takao, Hitachi Medical ,  TAKESHIMA, Hirotaka, Hitachi Medical ,  KAWANO, Hajime, Hitachi Medical ,  TAKUMA, Yutaka, Hitachi Medical ,  KOTABE, Munenori, Hitachi Medical ,  MAKI, Naoki ,  HARA, Nobuhiro ,  KAKUGAWA, Shigeru ,  HINO, Noriaki

IPC分类号： H01F7/22

CPC分类号： H01F6/00 ,  G01R33/3815

摘要： A small-sized highly precise superconducting magnet device such that the magnetic flux changes little with the time and quenching hardly occurs. A magnetization adjusting method for uniformly magnetizing such a magnet device is also disclosed. The superconducting magnet device has a coolant container, a permanent current retaining medium which is provided in the container and generates a magnetic flux in a uniform magnetic field region (FOV), a static magnetic field generating means composed of a plurality of cylindrical bodies made up of superconducting composite plates, a cylindrical body supporting base which supports the cylindrical bodies, and temperature adjusting elements (not shown in Fig. 67) buried in the cylindrical bodies. The static magnetic field generating means is magnetized by induction magnetization and the magnetization value is adjusted by controlling the temperatures of the cylindrical bodies by means of the temperature adjusting elements.

公开(公告)号：EP3075982B1

公开(公告)日：2020-01-08

申请号：EP13898164.2

申请日：2013-11-27

申请人： Hitachi, Ltd.

发明人： KUSUMI, Naohiro ,  HINO, Noriaki ,  AUNG, Kothet

IPC分类号： F02C3/10 ,  F02C6/00 ,  F02C9/28 ,  F02C7/36

公开(公告)号：EP3351789A1

公开(公告)日：2018-07-25

申请号：EP18152222.8

申请日：2018-01-18

申请人： Hitachi, Ltd.

发明人： KAKUYA, Hiromu ,  YAMAMOTO, Yukio ,  HINO, Noriaki

IPC分类号： F03D7/02 ,  F03D7/04

CPC分类号： F03D7/0276 ,  F03D7/043 ,  Y02E10/723

摘要： A wind power generation system 1 includes: a blade 2; a rotor 4, wherein rotational energy of the rotor 4 is used to generate power; and a control device which controls a rotor rotation speed, wherein the control device keeps the rotor rotation speed to be a rated value in a case where the rotor rotation speed is equal to or more than a first wind speed, and wherein, in a case where the rotor rotation speed is less than the first wind speed and equal to or more than a second wind speed, a first operation mode in which a rotor rotation speed target value is increased to a value larger than the rated rotor rotation speed, and a second operation mode in which the rotor rotation speed target value is reduced from the value larger than the rated rotor rotation speed to the rated rotor rotation speed are executable.