Magnetic position sensor having spaced toroidal magnets in a sta

Details Magnetic position sensor having spaced toroidal magnets in a sta Magnetic position sensor having spaced toroidal magnets in a sta

1987-08-28

1989-08-01

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

33 1M, 74471XY, 324207, 340709, 901 2, 901 15, 901 46, G01B 730, G01B 714, G05G 900, G09G 100

Patent

active

048536300

ABSTRACT:
Two toroidal magnets are spaced apart form each other by a ferrous spherical spacer. The spacer partially engages openings provided in the two magnet surfaces facing each other. The facing magnet surfaces have the same polarity, repelling each other. The configuration creates a stable equilibrium by conduction of the magnetic flux through the spacer and the repulsive forces at the periphery of the magnets. Four "Hall Effect" sensors are mounted to one of the magnets. These sensors detect minute changes in the device's magnetic field caused by relative rotation or other movement of the magnets. A third magnet may be added for tactile sensor applications, allowing evaluation of the pressure exerted on the device.

REFERENCES:
patent: 3849724 (1974-11-01), Ghibu et al.
patent: 4282484 (1981-08-01), Morrow
patent: 4517514 (1985-05-01), Howell
patent: 4628755 (1986-12-01), Hawley
patent: 4639668 (1987-01-01), Petit et al.

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