公开(公告)号：US20040217834A1

公开(公告)日：2004-11-04

申请号：US10854167

申请日：2004-05-27

申请人： Hitachi, Ltd. ,  Hitachi Engineering & Services, Co. , Ltd.

发明人： Ayumu Morita ,  Yasuaki Suzuki ,  Masato Yabu ,  Tooru Tanimizu ,  Yozo Shibata ,  Takashi Kadowaki

IPC分类号： H01F007/08

CPC分类号： H01H33/6662 ,  H01F7/122 ,  H01F7/1615 ,  H01F7/1623 ,  H01H51/2209

摘要： An electromagnet includes a coil, a movable iron core adapted to move on the center axis of the coil, and a stationary iron core provided so as to cover the upper and lower surfaces and the outer peripheral surface of the coil. A permanent magnet is arranged in a gap surrounded by the movable iron core and the stationary core.

公开(公告)号：US20040164828A1

公开(公告)日：2004-08-26

申请号：US10785022

申请日：2004-02-25

申请人： HITACHI, LTD. ,  HITACHI ENGINEERING & SERVICES CO., LTD.

发明人： Ayumu Morita ,  Yasuaki Suzuki ,  Masato Yabu ,  Tooru Tanimizu ,  Yozo Shibata ,  Takashi Kadowaki

IPC分类号： H01F007/08

CPC分类号： H01H33/6662 ,  H01F7/122 ,  H01F7/1615 ,  H01F7/1623 ,  H01H51/2209

摘要： An electromagnet composed of a coil, a movable iron core adapted to move on the center axis of the coil, and a stationary iron core provided so as to cover the upper and lower surfaces and the outer peripheral surface of the coil, characterized by a permanent magnet arranged in a gap surrounded by the movable iron core and the stationary core, wherein the movable iron core is attracted by the stationary iron core by a magnetic field created by the permanent magnet, thereby it is possible to solve a problem inherent to a conventional electromagnet such that a permanent magnet is directly energized in a reverse direction during release operation so as to cause demagnetization of the permanent magnet. That is, since the permanent magnet is arranged in the gap surrounded by the movable iron core and the stationary iron core, the magnetic filed can be prevented from affecting upon the permanent magnet, thereby it is possible to provide an electromagnet having a long use like and a high degree of reliability with no demagnetization of a permanent magnet.

摘要翻译： 由线圈构成的电磁铁，适于在线圈的中心轴线上移动的可动铁心和设置成覆盖线圈的上下表面和外周面的静止铁芯，其特征在于， 磁铁被布置在由可动铁芯和固定铁芯围绕的间隙中，其中可动铁芯被永磁铁产生的磁场由固定铁芯吸引，从而可以解决常规 电磁体，使得永久磁铁在释放操作期间沿相反方向直接通电，从而使永久磁铁退磁。 也就是说，由于永磁体被布置在由可动铁芯和固定铁芯包围的间隙中，因此可以防止磁场对永磁体产生影响，从而可以提供长时间使用的电磁体 并且具有高可靠性而不会使永磁体退磁。