Magnetic monitoring device, particularly for monitoring the parameters of angular movement of rotating members having a peripheral irregularity
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United States of America Patent
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Mar 26, 1991
Grant Date -
N/A
app pub date -
Apr 28, 1988
filing date -
Apr 28, 1987
priority date (Note) -
Expired
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Abstract
The invention relates to monitoring techniques, such as angular movement monitoring techniques, in which an element with at least one peripheral irregularity is moved relative to a magnetic circuit so as to induce a variation in the reluctance in the magnetic circuit which can be detected externally. A device is disclosed including two magnetic elements defining respective magnetic circuits symmetrical with each other. Between the two magnetic members a gap is formed of approximately the same size of a peripheral irregularity, consisting of a notch or a tooth of a moving member, which is passed in front of the two magnetic circuits to cause a corresponding variation in reluctance in the magnetic circuits which produce a disturbance in the characteristics of symmetry, detectable by a sensor preferably a Wiegand-effect sensor.
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