Title: Electromagnetic and operating mechanism of switch using said electromagnet
Application Number: 01125153 Application Date: 2001.08.30
Publication Number: 1366312 Publication Date: 2002.08.28
Approval Pub. Date: 2005.12.28 Granted Pub. Date: 2005.12.28
International Classifi-cation: H01F7/122;H01H3/28
Applicant(s) Name: Hitachi, Ltd. Address:
Inventor(s) Name: Morita Shiki;Suzuki Yasuaki;Hagi Masaudo
Attorney & Agent: wang sibeng
Abstract:
    An electromagnet 10 composed of a coil 3, a movable iron core 1 adapted to move on the center axis of the coil 3, and a stationary iron core 2 provided so as to cover the upper and lower surfaces and the outer peripheral surface of the coil, characterized by a permanent magnet 12 arranged in a gap surrounded by the movable iron core 1 and the stationary core 2, wherein the movable iron core 1 is attracted by the stationary iron core 2 by a magnetic field created by the permanent magnet 12, 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.
Time: 50
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