Arrangement with field correcting structure producing a homogene

Details Arrangement with field correcting structure producing a homogene Arrangement with field correcting structure producing a homogene

1991-06-03

1993-05-11

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

324174, 32420721, G01P 3488, G01B 714

Patent

active

052104893

ABSTRACT:
The invention relates to an arrangement (10) for detecting a moved ferromagnetic element (16) comprising a magnet (11), to which a sensor (14) is assigned on one of its pole faces (12) at a certain distance from the moved element (16). Such arrangements (10) are known, for example, for detecting the speed of a toothed wheel (16). In such known arrangements (10), the positioning of the sensor (14) on the magnet (11) is critical as far as offset voltages in the stationary condition should be avoided in order to obtain a high sensitivity. For an accurate positioning the magnet (11) of such an arrangement (10) has means for producing at least one magnetic imperfection for symmetrization and parallelization of a magnetic field (17) located in the direction of movement (A) of the moved element (16) and of a perpendicular to the pole face (12) for forming a mounting zone (24) free from sensor signal voltage for the sensor (14).

REFERENCES:
patent: 3846697 (1974-11-01), Cila et al.
patent: 4524932 (1985-06-01), Bodziak
patent: 4712064 (1987-12-01), Eckardt et al.
patent: 4745363 (1988-05-01), Carr et al.
patent: 4853632 (1989-08-01), Nagano et al.
patent: 4937522 (1990-06-01), Gee
patent: 4992731 (1991-02-01), Lorenzen
patent: 4992733 (1991-02-01), Griebeler
Hans Hellmuth Cuno, Einfache Berechnung von Feldplattendaten in Abhangigkeit von Magnetfeld und Temperatur, Bauteile Report, vol. 14, No. 3, 1976, pp. 89-93.

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