Magnetic rotational position sensor with improved output lineari

Details Magnetic rotational position sensor with improved output lineari Magnetic rotational position sensor with improved output lineari

1993-02-18

1995-08-22

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

Displacement

32420725, 32420712, 123376, G01B 730, G01B 714, F02D 900

Patent

active

054443695

ABSTRACT:
A rotary shaft position sensor includes a stator and a rotor and produces a linear output signal in accordance with the rotational position of a shaft coupled to the rotor. The rotor rotates about an axis of rotation. The stator includes stationary pole pieces having stationary pole faces situated perpendicular to the axis of rotation and spaced a predetermined distance apart to define an air gap therebetween. A Hall effect device is situated-in the air gap. The Hall device produces an output signal corresponding to the level of magnetic flux in the air gap. One or more magnets are attached to the rotating pole piece. The magnetic poles of the magnets are situated parallel with and spaced a predetermined distance from the stationary pole faces. Lines of magnetic flux originating from the magnets are situated in a direction perpendicular to the stationary pole face. The rotating pole piece rotates in close proximity to the stationary pole pieces. As the rotor rotates about the axis of rotation, a portion of the magnet is aligned with the stationary pole faces. Magnetic flux corresponding to the aligned portion of the magnet and the stator pole faces appears in the air gap. A temperature compensation circuit for use with the rotary shaft position sensor includes first and second temperature compensation circuits for counteracting sensitivity temperature drift and zero gauss offset temperature drift characteristics of the Hall effect device.

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G. Lemarquard et al., "Annular Magnetic Position Sensor," IEEE Transactions on Magnetics, vol. 26, No. 5, Sep. 1990.

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