Electricity: measuring and testing – Magnetic – Displacement
Patent
1996-11-01
1999-11-09
Strecker, Gerard
Electricity: measuring and testing
Magnetic
Displacement
12340658, 32420725, 324174, 324252, G01B 730, G01R 3309, G01P 3481, F02P 7067
Patent
active
059821710
ABSTRACT:
A sensing device capable of outputting a correct signal precisely corresponding to a particular position (angle) of, for example a protruding or recessed portion of a rotating member made of a magnetic material as soon as the electric power of the sensing device is turned on. The sensing device includes: a magnet for generating a magnetic field; a rotary member of magnetic material for changing the magnetic field generated by the magnet, the rotary member being disposed at a predetermined distance apart from the magnet; a giant magnetoresistance device which changes in resistance in response to the magnetic field whose magnitude is changed by the rotary member of magnetic material; and a differential amplifier for detecting the displacement of said rotary member of magnetic material and also the relative position of said rotary member of magnetic material with respect to said giant magnetoresistance device when said rotary member of magnetic material is at rest, on the basis of the output signal of said giant magnetoresistance device.
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Journal of Magnetics Society of Japan, Vol. 15, No. 51991, pp. 813 to 820.
Fukui Wataru
Hiraoka Naoki
Ohashi Yutaka
Umemoto Hideki
Yokotani Masahiro
Mitsubishi Denki & Kabushiki Kaisha
Strecker Gerard
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