Position sensing transducer having a circular magnet with an int

Details Position sensing transducer having a circular magnet with an int Position sensing transducer having a circular magnet with an int

1989-11-17

1991-02-12

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

324235, G01B 714

Patent

active

049927337

ABSTRACT:
An improved magnetic sensor for use in measuring the position, velocity and/or direction of movement of an object having alternating zones in the direction of movement of different magnetic conductivity 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 ferromagnetic strip of high permeability is mounted on the face of the magnet coaxial therewith and has a length dimension in the direction of movement of the object which is greater than the width dimension transverse to the direction of movement. A pair of sensor elements are mounted on the ferromagnetic strip, one on each of the opposite sides of the magnet axis in the direction of movement of the object. The ferromagnetic strip distorts the field of the permanent magnetic member in the area of each of the sensor elements such that the flux lines in the area of each of the sensors are urged toward a transverse direction relative to the direction of movement of the object, whereby the flux field in the area of each of the sensors is uniform. The ram in a metal die casting machine can be positioned using the sensor and/or the position, velocity and direction of movement of the ram can be determined through use of the sensor.

REFERENCES:
patent: 3636767 (1972-01-01), Duffy
patent: 3956973 (1976-05-01), Pomplas
patent: 4268771 (1981-05-01), Lace
patent: 4384252 (1983-05-01), Kolter
patent: 4611169 (1986-09-01), Hermann
patent: 4612502 (1986-09-01), Spies
patent: 4647892 (1987-03-01), Hewitt
patent: 4859941 (1989-08-01), Higgs et al.

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