Displacement detector with three secondary coils, one of which p

Details Displacement detector with three secondary coils, one of which p Displacement detector with three secondary coils, one of which p

1987-03-18

1988-11-08

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

7386233, 180 791, 318657, 336130, 34087036, G01B 714, G08C 1908, B62D 504

Patent

active

047836261

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.

REFERENCES:
patent: 2564221 (1951-08-01), Hornfeck
patent: 3181055 (1965-04-01), Bischof
patent: 3225289 (1965-12-01), Koppel et al.
patent: 3441834 (1969-04-01), Moskowitz et al.
patent: 3555405 (1971-01-01), Martin
patent: 3573494 (1971-04-01), Houpt et al.
patent: 4437531 (1984-03-01), Urabe
patent: 4455555 (1984-06-01), Symonds et al.
patent: 4678991 (1987-07-01), Schmidt

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