Electricity: measuring and testing – Magnetic – Displacement
Patent
1992-08-05
1994-05-24
Snow, Walter E.
Electricity: measuring and testing
Magnetic
Displacement
32420713, 32420724, 338 32R, G01B 714, G01R 3302
Patent
active
053152441
ABSTRACT:
An improved magnetic sensor for use in measuring the position, velocity and/or direction of movement of an object having alternating zones of different magnetic conductivity in the direction of movement, comprises a permanent magnet member having a pole face facing the moving object and having an axis transverse to the direction of movement thereof. A pair of sensor elements are mounted on the permanent magnet pole face, one on each of the opposite sides of the magnet axis in the direction of movement of the object. A laminated flux bar having strips of ferromagnetic material of high permeability and strips of ceramic material having low permeability is mounted on the pair of sensor elements. The ferromagnetic laminations of the flux bar concentrate the field of the permanent magnet member through the sensitive area of each of the sensor elements such that the signal-to-noise ratio of the overall magnetic sensor is increased, decreasing the sensors sensitivity to changes in temperature and changes in the gap between the object and the sensor. The ram in a metal diecasting machine can be positioned using the sensor and/or the position, velocity and direction of movement of the ram can be determined through the use of improved magnetic sensor.
REFERENCES:
patent: 3846697 (1974-11-01), Cila et al.
patent: 4204159 (1980-05-01), Sarian et al.
patent: 4733177 (1980-03-01), Pawletko
patent: 4922197 (1990-06-01), Juds et al.
Snow Walter E.
Visi-Trak Corporation
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