Magnetic encoder for sensing position and direction via a time a

Details Magnetic encoder for sensing position and direction via a time a Magnetic encoder for sensing position and direction via a time a

1997-06-02

1999-08-17

Strecker, Gerard

Electricity: measuring and testing

Magnetic

Displacement

32420718, 32420722, 32420725, 336200, 341 15, H03M 124, G01B 730, G01B 712, G01P 1300

Patent

active

059398795

ABSTRACT:
A magnetic encoder is disclosed that provides a uniform magnetic field which is time modulated at a carrier frequency and space modulated by a repetitive pattern of eddy-current conducting lands that move with variable motion. The time modulation is provided by driving an electrical coil in a resonant tank circuit. The space modulation provides areas of higher and lower magnetic field intensity which change in correspondence with the motion of the conducting lands. The intensity of the varying magnetic field is detected by a series connected pair of stationary coils that are positioned orthogonal to both the direction of the changing magnetic field and the direction of the motion of the conducting lands. The pair of stationary coils yield a differential electrical signal that is representative of the motion of the conducting lands.

REFERENCES:
patent: 2706805 (1955-04-01), Clewell
patent: 3281825 (1966-10-01), Corl et al.
patent: 3786354 (1974-01-01), Lasky
patent: 3820110 (1974-06-01), Henrich et al.
patent: 4156192 (1979-05-01), Schedrovitsky et al.
patent: 4507638 (1985-03-01), Brosh
patent: 4654636 (1987-03-01), Rusk
patent: 4777436 (1988-10-01), Fiori, Jr.

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