Displacement detection device

Details Displacement detection device Displacement detection device

1988-12-16

1990-10-30

Ruehl, Charles A.

Measuring and testing

Dynamometers

Responsive to torque

324225, 3242072, 338 32H, G01L 310, G01R 3306, H01L 4306

Patent

active

049660411

ABSTRACT:
A pair of permanent magnets adjoining each other and magnetized with opposite polarities are coupled with a movable object through a connecting shaft so that the pair of permanent magnets are aligned in a direction of displacement of the movable object. A first and a second Hall element is disposed stationary at a position opposing to the pair of permanent magnets and aligned also in the direction of displacement of the movable object with a predetermined space interval between the first and second Hall elements. When the movable object is displaced in one direction, and hence the pair of magnets are moved from a neutral position at which the boundary of the pair of magnets corresponds to the center of the interval of the first and second Hall elements, output voltages of different phases are respectively generated by the first and second Hall elements. An input current corresponding to a difference value between the output voltages is supplied to each of the first and second Hall elements to compensate for a change in characteristics of the permanent magnets and Hall elements due to a change in ambient temperature.

REFERENCES:
patent: 3379057 (1968-04-01), Hegenbart
patent: 4107604 (1978-08-01), Bernier
patent: 4425557 (1984-01-01), Nakamura
patent: 4731579 (1988-03-01), Petersen et al.
patent: 4857842 (1989-08-01), Sturman et al.

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