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US4217512A Apparatus for generating a pulse when a first member passes a second member using permanent magnets with different strengths 失效
用于当第一构件使用具有不同强度的永磁体使第二构件通过时产生脉冲的装置

Apparatus for generating a pulse when a first member passes a second member using permanent magnets with different strengths
摘要：
A Wiegand wire is placed within the magnetic field generated by a first and second permanent magnet. The first permanent magnet has a field strength exceeding that of the second permanent magnet and the polarity of its magnetic field is opposite that of the second magnet. A rotor having segments of magnetic shielding alternating with slots is rotated between the Wiegand wire and the first magnet. When the magnetic shielding is between the first magnet and the Wiegand wire, the latter is exposed only to the magnetic field of the second permanent magnet. In a second position of the rotor, the Wiegand wire is exposed to both magnetic fields. Since the second permanent magnet generates a stronger field than the first, the direction of magnetization in the Wiegand wire changes abruptly causing a pulse to be generated in pick-up coil 4.
摘要（中）：

韦根线被放置在由第一和第二永磁体产生的磁场内。 第一永久磁铁的场强超过第二永久磁铁，其磁场的极性与第二磁铁的极性相反。 具有与槽交替的磁屏蔽的转子的转子在Wiegand线和第一磁体之间旋转。 当磁屏蔽位于第一磁体和韦根线之间时，后者仅暴露于第二永磁体的磁场。 在转子的第二位置，Wiegand线暴露于两个磁场。 由于第二永久磁铁产生比第一永久磁铁更强的磁场，因此威格宁线中的磁化方向突然变化，导致在拾取线圈4中产生脉冲。

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