Plural magnet device for magnetically detecting rotation angle o

Details Plural magnet device for magnetically detecting rotation angle o Plural magnet device for magnetically detecting rotation angle o

1988-05-04

1989-09-12

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

123617, G01B 730, F02P 7067

Patent

active

048663816

ABSTRACT:
A rotation angle detector has magnets of different polarities arranged with one polarity alternately with the other polarity on the circumferential surface of a rotary body, wherein a plurality of magnets on the portions of the circumferential surface having a width which is different from that of a plurality of magnets on the remaining portions. A single rotation angle sensor arranged to oppose the circumferential surface of the rotary body scans the magnets when the rotary body is rotated, thereby outputting a reference signal and a rotation angle signal. Mutually adjacent magnets which differ in width are so formed that whichever is scanned earlier by the rotation angle sensor will have a width narrowed by a predetermined amount if it is wider than the other or a width widened by the predetermined amount if it is narrower than the other. Irrespective of the altered width, the sum of the magnetized areas of these mutually adjacent magnets is held constant. This arrangement corrects a magnetic imbalance at locations where the width of one magnet differs from that of its neighbor, thereby enabling an ideal output waveform to be obtained from the rotation angle sensor.

REFERENCES:
patent: 4551676 (1985-11-01), Amemiya et al.
patent: 4695795 (1987-09-01), Nakamizo et al.
patent: 4746862 (1988-05-01), Ueki

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