Magnetic rotary encoder for detection of absolute values of angu

Details Magnetic rotary encoder for detection of absolute values of angu Magnetic rotary encoder for detection of absolute values of angu

1979-03-05

1981-06-16

Smith, Alfred E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324151R, 324208, 340347P, G01P 348, G01P 354

Patent

active

042740533

ABSTRACT:
A magnetic rotary encoder for detecting the absolute value of an angular displacement using magneto-resistors is disclosed. A drum, disk or cup-shaped rotary member is attachable to a rotatable shaft. A magnetic medium divided into a plurality of tracks is provided on a surface of the rotary member. Each of the tracks produces magnetic fields changing in magnitude and direction as the rotary member revolves. Alternatively, a plurality of permanent magnets are provided on the surface of the rotary member to produce the alternating magnetic field as the rotary member revolves. A plurality of magneto-resistors are provided in the vicinity of the rotating paths of the tracks and produce analog signals indicative of changes in their electrical resistances. A rotary condition detector receives the analog signals and produces digital signals and/or an analog signal indicative of the angular distance moved by the rotatable shaft in an absolute value.

REFERENCES:
patent: 3197763 (1965-07-01), Fisher
patent: 3293636 (1966-12-01), Dunne
patent: 3613000 (1971-10-01), Weir et al.
patent: 3993946 (1976-11-01), Makino
patent: 4039936 (1977-08-01), Janes et al.
A. B. Wills, Technical Disclosure Bulletin, vol. 16, No. 1 (Jun. 1973), p. 260.
"The Barber Pole, A Linear Magnetoresistive Head," by K. E. Kuijk et al., published in IEEE Transaction on Magnetics, vol. Mag.-11, No. 5, (Sep. 1975), pp. 1215-1217.

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