High sensitivity magnetic circuit

Details High sensitivity magnetic circuit High sensitivity magnetic circuit

1988-08-08

1990-05-15

Eisenzopf, Reinhard J.

Electricity: measuring and testing

Magnetic

Displacement

338 32R, 32420722, G01B 714, H01L 4300

Patent

active

049261223

ABSTRACT:
For increased sensitivity a position sensor includes a magnetic circuit in which the stationary portion includes a permanent magnet whose width is optimally 1.5 times the tooth pitch of the exciter portion of the sensor and the magnet face proximate the exciter includes a thin layer of ferromagnetic material over which is centered a narrow magnetic sensing element, such as a magnetoresistor. The sensing element has a width typically less than the tooth width which is between 0.17 and 0.37 the tooth pitch. The needed flux density is typically available simply by appropriate magnet thickness or choice of magnet material without the need of a flux guide.

REFERENCES:
patent: 4612502 (1986-09-01), Spies
patent: 4733177 (1988-03-01), Pawletko
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S. Kataoka, "Recent Development of Magnetoresistive Devices and Applications," Circulars of the Electrotechnical Laboratory, No. 182, UDC 621,382:537.621.2, pp. 1-52, Agency of Industrial Science and Technology, 2-Chome Nagata-Cho, Chiyoda-Ku, Tokyo, Japan (Dec. 1974).
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T. Yamada, "A New Highly Sensitive Magnetoresistive Effect in Semiconductors", Proceedings of the IX International Conference on the Physics of Semiconductors, vol. 2, Moscow, Jul. 23-29, 1968, pp. 673-675.
G. H. Dohler, "Physics and Applications of Doping Superlattices", a paper from pp. 270-284 of the book Two-Dimensional Systems, Physics and New Devices; Proceedings of the International Winterschool, Mauternsdorf Austria, 1986, published by Springer Verlag, Berlin 1986.
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