Electricity: measuring and testing – Magnetic – Displacement
Patent
1988-05-16
1989-04-25
Eisenzopf, Reinhard J.
Electricity: measuring and testing
Magnetic
Displacement
74471XY, 200 6A, 307309, 324251, 338 32H, 340709, G01B 714, G05G 900
Patent
active
048251577
ABSTRACT:
A Hall-effect control apparatus incorporating an actuator member having a magnetic core, and which is pivotally mounted on a base for movement in X-axis and Y-axis directions. An electrically energized coil excited with a. c. voltage produces a fluctuating magnetic field in the vicinity of the core. Four Hall-effect sensors are mounted on the base, and are arranged to sense changes in the a. c. field as the core member moves. The output of the Hall-effect sensors is both d. c. and a. c.; an electrical circuit connected therewith processes these voltages so as to cancel out any d. c. components thereof. The output of the electrical circuit in turn provides two voltages which are indicative of the X-axis and the Y-axis positions of the actuator member. The device is immune to interruption arising from d. c. fields, such as that of the earth; also significant immunity against error due to temperature fluctuations is realizeable, as is immunity to error arising from aging of the various components. There is thus achieved improved accuracy and linearity as compared to the various devices of the prior art.
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Eisenzopf Reinhard J.
Lehmann H. Gibner
Lehmann K. Gibner
Mueller Robert W.
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