Magnetic position and speed sensor having a hall probe

Details Magnetic position and speed sensor having a hall probe Magnetic position and speed sensor having a hall probe

1996-02-22

2000-03-28

Snow, Walter E.

Electricity: measuring and testing

Magnetic

Displacement

32420725, G01B 714, G01B 730, G01R 3306, H01L 4306

Patent

active

06043645&

ABSTRACT:
This invention relates to a position sensor featuring a stator defining an air gap inside of which a mobile magnet integral with a coupling shaft moves. The sensor features a Hall probe for measuring the variation of the induction in an air gap. The stator is formed of a first stationary part and a second part which is either stationary or mobile, the two parts defining between them a main air gap in which the part of the mobile element moves. The mobile element exhibits at least two adjacent thin parts magnetized crosswise in alternate directions, the magnetized parts being made of a material exhibiting in the entire working area a practically linear demagnetization characteristic and reversible permeability close to that of the air. The stationary part exhibits at least two secondary air gaps approximately perpendicular to the main air gap in which the mobile element moves. The Hall probe is housed in one of the secondary air gaps. The L/E ratio is greater than 6, L designation the width of a magnetic pole and E designating the width of main air gap.

REFERENCES:
patent: 3162804 (1964-12-01), Parsons
patent: 3194990 (1965-07-01), Kendall
patent: 4392375 (1983-07-01), Eguchi et al.
patent: 5394081 (1995-02-01), Ogawa et al.
patent: 5528139 (1996-06-01), Oudet et al.

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