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    • 8. 发明授权
    • Plunger type electromagnet
    • 柱塞式电磁铁
    • US5268662A
    • 1993-12-07
    • US919588
    • 1992-07-24
    • Tokio UetsuharaYuichi AndoKenji IioKenichiro Kinoshita
    • Tokio UetsuharaYuichi AndoKenji IioKenichiro Kinoshita
    • H01F7/122H01F7/13H01F7/16H01F7/00H01F7/08
    • H01F7/1615H01F7/13
    • A plunger type electromagnet is provided with an attractive plate connected to the plunger, with an improved configuration of plunger and stationary element, or with a flanged tubular member of magnetic material affixed to the axial end of a coiling bobbin, in order to increase the rate of change in the permeance of the magnetic circuit at the time of attractive operation and to enhance the sensitivity of the electromagnet.Furthermore, the surface area of the abutment faces of the stationary and movable elements is calibrated so as to control the attractive and retaining force thereof.In some embodiments, a permanent magnet is provided which is shaped in the form of an annulus and is magnetized in the direction of thickness of the annulus, so as to facilitate magnetization of the permanent magnet, to reduce the number of component parts, and to provide an electromagnet which is compact in size, light in weight, and suitable for mass production.
    • 柱塞式电磁体设置有连接到柱塞的吸引板,具有柱塞和固定元件的改进的构造,或者具有固定到卷绕线轴的轴向端的磁性材料的带凸缘的管状构件,以便提高速率 在有吸引力的操作时磁路的磁导率的变化并且提高电磁体的灵敏度。 此外,固定和可移动元件的邻接面的表面积被校准,以便控制其吸引力和保持力。 在一些实施例中,提供永磁体,其形成为环形的形状,并且沿着环的厚度的方向被磁化,以便于永磁体的磁化,以减少部件的数量,并且 提供尺寸紧凑,重量轻的电磁铁,并适合批量生产。