Displacement detector with three secondary coils, one of which provides a constant bias output
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United States of America Patent
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Nov 8, 1988
Grant Date -
N/A
app pub date -
Mar 18, 1987
filing date -
Mar 18, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A displacement detector includes a movable member of a magnetic material movable as a function of the displacement of an object which is to be detected, an AC signal source, a primary coil energizable by an AC signal supplied by the AC signal source for generating a magnetic field in the direction in which the movable member is movable, secondary coils located in at least two positions spaced along and disposed around the path of movement of the movable member, a third coil disposed in the range of movement of the movable member and around the path of movement of the movable member, first, second, and third rectifier circuits connected respectively to the secondary coils and the third coils, and a processing circuit for processing outputs supplied from the first, second, and third rectifier circuits. The displacement detector can be incorporated in an automotive power steering device having input and output shafts coaxially coupled to each other by a resilient member which is twistable about its own axis.
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