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    • 1. 发明授权
    • Magnetic protection device
    • 磁保护装置
    • US5854429A
    • 1998-12-29
    • US793790
    • 1997-06-09
    • Lionel HaudebertMarcel Freund
    • Lionel HaudebertMarcel Freund
    • G12B17/02G01F1/075H02K11/00H02K49/10G01N1/58
    • H02K49/108G01F1/0755G01F15/07H02K11/01
    • A protection device (70) for providing a drive system (60) for imparting rotary drive between two mechanical members (28, 44) about an axis by magnetic coupling with protection from an external magnetic field, said drive system including at least two axially magnetized elements (62a, 62b, 64a, 64b) each secured to at least one of said mechanical members and designed to interact with one another, said magnetized elements being axially offset, said protection device comprising two parts (72, 74; 92, 94; 96, 98) of magnetic material surrounding said drive system, each of said parts having a minimum radial extent greater than the radial extent of said magnetized elements, the protection device being characterized in that the two parts (72, 74; 92, 94; 96, 98) of magnetic material leave between them an axial space (76) so as to reduce the gradient of the external magnetic field at the drive system, and have an axial extent such that they encompass said drive system axially.
    • PCT No.PCT / FR95 / 01052 Sec。 371日期:1997年6月9日 102(e)日期1997年6月9日PCT提交1995年8月4日PCT公布。 出版物WO96 / 06480 PCT 日期1996年2月29日一种用于提供驱动系统(60)的保护装置(70),该驱动系统(60)用于通过与外部磁场的保护而通过磁耦合在两个机械构件(28,44)之间绕轴线传递旋转驱动,所述驱动系统包括 至少两个轴向磁化元件(62a,62b,64a,64b),每个轴向磁化元件(62a,62b,64a,64b)各自固定到所述机械构件中的至少一个并被设计成彼此相互作用,所述磁化元件被轴向偏移,所述保护装置包括两个部分 ; 92,94; 96,98)围绕所述驱动系统的磁性材料,每个所述部件具有比所述磁化元件的径向扩展程度更大的最小径向范围,所述保护装置的特征在于,所述两部分(72,74) ; 92,94; 96,98)的磁性材料在它们之间留下轴向空间(76),以便减小驱动系统处的外部磁场的梯度,并且具有轴向范围使得它们轴向地包围所述驱动系统 。