Electricity: measuring and testing – Magnetic – Displacement
Patent
1991-01-18
1993-11-16
Strecker, Gerard R.
Electricity: measuring and testing
Magnetic
Displacement
324173, 324252, 338 32R, G01B 714, G01P 342
Patent
active
RE0344435
ABSTRACT:
Magnetic poles are provided continuously with a pitch .lambda. on the peripheral portion of a drum rotated in accordance with a movement of a moving body. A magnetic sensor is provided in opposition to these poles. The sensor is formed of two magnetoresistive element pairs which are spaced from each other at .lambda./6, and the two elements in each pair are arranged in positions spaced from each other at .lambda./2. The two elements in each pair are connected in series to form a bridge circuit. The signals obtained from the nodes of the series-connected elements in the two element pairs are differentially amplified so that third harmonic wave components are eliminated, and a signal having no distortion and representative of the position or speed of the moving body can be obtained.
REFERENCES:
patent: 4319188 (1982-03-01), Ito et al.
patent: 4594548 (1986-06-01), Takahashi et al.
patent: 4663588 (1987-05-01), Himuro et al.
Kawamata Syooichi
Miyashita Kunio
Takahashi Tadashi
Yamashita Seizi
Edmonds Warren S.
Hitachi , Ltd.
Strecker Gerard R.
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