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公开(公告)号：US4818966A
公开(公告)日：1989-04-04
申请号：US174172
申请日：1988-03-28
IPC分类号： A61B5/055 , G01R33/383 , H01F7/02 , H01F3/04
CPC分类号： H01F7/0278 , G01R33/383
摘要： A magnetic field-generating device includes a pair of permanent magnet components disposed in such a manner as to face each other with a gap formed therebetween, a yoke for magnetically coupling the pair of permanent magnet components, and pole pieces which are each fixed to a surface of a corresponding permanent magnet component that faces the gap. The magnetic field generating device is adpated to generate a magnetic field in the gap. Each of the pole pieces is made of a laminate of magnetic plates which laminated in a direction substantially perpendicular to the sides of the solid care portion.
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公开(公告)号：US4679022A
公开(公告)日：1987-07-07
申请号：US909327
申请日：1986-09-19
IPC分类号： G01R33/383 , H01F7/02
CPC分类号： G01R33/383 , H01F7/0278
摘要： A magnetic field generating device for nuclear magnetic resonance-computerized tomography of the type wherein permanent magnet assemblies of a pair opposing mutually to define an air gap therebetween are magnetically coupled together by yoke means to create a magnetic field within the air gap is provided, which is characterized in that each permanent magnet assembly comprises a flat plate-like central permanent magnet and peripheral permanent magnets arranged around the central permanent magnet and inclined toward the inside of the air gap, the magnetic pole surface of each permanent magnet assembly forms a curved concave face with respect to the air gap, and each permanent magnet is magnetized in the direction perpendicular to the corresponding magnetic pole surface, whereby the leakage flux is reduced and the magnetic efficiency is enhanced, thus, reduction of the device dimension and weight can be achieved.
摘要翻译： 一种用于核磁共振计算机断层摄影的磁场产生装置，其中一对相对的互相定义气隙的永磁体组件通过轭装置磁耦合在一起，以在气隙内产生磁场，其中 其特征在于，每个永磁体组件包括平板状中心永磁体和围绕中心永磁体布置并且朝向空气间隙的内侧倾斜的外围永磁体，每个永磁体组件的磁极表面形成弯曲的凹部 并且每个永磁体在垂直于相应的磁极表面的方向上被磁化，从而减小漏磁通并提高磁效率，从而可以实现器件尺寸和重量的减小 。
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公开(公告)号：US4672346A
公开(公告)日：1987-06-09
申请号：US719820
申请日：1985-04-04
IPC分类号： B29C67/20 , C08J5/18 , G01R33/383 , H01F7/02 , H01F7/00
CPC分类号： C08J5/18 , B29C67/20 , G01R33/383 , H01F7/0278 , C08J2323/02
摘要： A magnetic field generating device for a nuclear magnetic resonance-computerized tomography comprising a pair of permanent magnets magnetized in the same direction with different-polarity poles opposing mutually to define an air gap, whose maximum energy product, (BH).sub.max, is not less than 30 MGOe (240 KJ/m.sup.3), on each of the opposing faces of the permanent magnets a magnetic pole segment being provided which has an annular projection and, as occasion demands, at least one central convex projection inside the annular projection, and the permanent magnets being coupled magnetically by a yoke to generate a magnetic field within the air gap.The present device is able to create a uniform and stable magnetic field, in spite of its small-sized body.
摘要翻译： 一种用于核磁共振计算机断层摄影的磁场产生装置，包括一对永磁体，该永久磁体在与相互相对的相反极性磁极相同的方向上磁化，以限定气隙，其最大能量乘积（BH）max不小于 在超过30MGOe（240KJ / m3）的情况下，在永磁体的每个相对面上设置有磁极段，其具有环形突起，并且根据需要，在环形突起内部具有至少一个中心凸起突起，并且 永磁体由磁轭磁耦合以在气隙内产生磁场。 本设备能够创建均匀且稳定的磁场，尽管其体积小。
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公开(公告)号：US4459500A
公开(公告)日：1984-07-10
申请号：US378273
申请日：1982-05-14
申请人： Toshinobu Miyamoto
发明人： Toshinobu Miyamoto
CPC分类号： H02K23/04
摘要： A magnetic field pole assembly for a direct-current motor comprises a nonmagnetic support member, a plurality of even pole pieces disposed in the support member and angularly spaced in symmetrical relationship around a central axis of the support member, a pair of permanent magnets mounted one on each side of each pole piece and having like plarities confronting each other across the pole piece, and yokes disposed between adjacent pole pieces and connected to and between those adjacent permanent magnets which are mounted on the adjacent pole pieces. Each of the permanent magnets is in the form of a plate magnetized in the direction of plate thickness and having one magnetic pole surface secured to a side of one of the pole pieces.
摘要翻译： 用于直流电动机的磁场极组件包括非磁性支撑构件，设置在支撑构件中的多个偶极极组件，并且围绕支撑构件的中心轴线以对称关系间隔成一对永磁体，一对永磁体安装成一个 在每个极靴的每一侧上，并且具有彼此相对于极靴相似的瑕疵，以及设置在相邻极片之间并连接到安装在相邻极片上的相邻永磁体之间和之间的轭。 每个永磁体都是在板厚方向上被磁化的板的形式，并且其一个磁极表面固定在一个极片的一侧。
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