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    • 6. 发明授权
    • Proximity detector employing magneto resistive sensor in the central
magnetic field null of a toroidal magnet
    • 接近检测器采用磁阻传感器在环形磁铁的中心磁场无效
    • US4857841A
    • 1989-08-15
    • US139350
    • 1987-12-29
    • Jerome K. HastingsBruce C. BeihoffMark A. Juds
    • Jerome K. HastingsBruce C. BeihoffMark A. Juds
    • G01D5/14G01D5/16H03K17/95
    • G01D5/145H03K17/9505H03K17/9517
    • The present invention is a proximity sensor employing a magneto resistive structure. This proximity sensor includes a toroidal magnet having a central aperture, an inner circumference and an outer circumference. This toroidal magnet has a first magnetic pole at the inner circumference and a second magnetic pole at the outer circumference thereby creating a magnetic field null at a center portion of the central aperture. A magneto resistive structure is disposed at the magnetic field null in the central aperture of the toroidal magnetic. This magneto resistive structure has a resistance dependent upon magnetic flux. The proximity of a magnetically permeable target to the toroidal magnet shifts the position of the magnetic null, thereby causing a large change in the magnetic flux through the magneto resistive structure. An electrical detection circuit detects changes in this resistance for indication of the proximity of the magnetically permeable target.
    • 本发明是采用磁阻结构的接近传感器。 该接近传感器包括具有中心孔,内圆周和外圆周的环形磁体。 该环形磁铁在内周具有第一磁极,在外周具有第二磁极,从而在中心孔的中心部分产生磁场零点。 磁阻结构设置在环形磁心的中心孔中的磁场为零。 该磁阻结构具有取决于磁通量的电阻。 导磁目标与环形磁铁的接近度使磁零位移动,从而导致通过磁阻结构的磁通量的大的变化。 电检测电路检测该电阻的变化,以指示导磁目标的接近度。