Angle sensor having lateral magnetic field sensor element and ax

Details Angle sensor having lateral magnetic field sensor element and ax Angle sensor having lateral magnetic field sensor element and ax

1998-06-24

2000-05-16

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Displacement

3242072, 32420721, G01B 730, G01D 516, G01D 518

Patent

active

060641975

ABSTRACT:
An angle sensor includes a lateral magnetic field sensor element (1) for producing a sensor signal (U.sub.S) which is dependent on the angular position of a target object (6) which is rotatable about an axis of rotation (5). The lateral magnetic field (8) is produced by a magnet (4) which also produces an axial magnetic field (7). Magnetic field sensor elements have a linear characteristic only over an angular range of up to at most 180.degree.. According to the invention, however, in addition to the field sensor element (1) there is also provided a measuring element (2) which determines the direction of an axial magnetic field (7) also produced by magnet (4) and which traverses the measuring element (2). An evaluation circuit (9) is thereby enabled to determine the angular position of the target object (6) from the sensor signal (U.sub.S) produced by the magnetic field sensor element (1) and the direction signal (U.sub.R) produced by the additional measuring element (2), which determination can be performed over an angular range exceeding 180.degree..

REFERENCES:
patent: 4283679 (1981-08-01), Ito et al.
patent: 4490674 (1984-12-01), Ito
patent: 5497082 (1996-03-01), Hancock
patent: 5602471 (1997-02-01), Muth et al.
patent: 5880586 (1999-03-01), Dukart et al.

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