Magnetic monitoring device, particularly for monitoring the para

Details Magnetic monitoring device, particularly for monitoring the para Magnetic monitoring device, particularly for monitoring the para

1988-04-28

1991-03-26

Strecker, Gerard R.

Electricity: measuring and testing

Magnetic

Displacement

73519, 324174, 32420725, G01P 3488, G01B 730

Patent

active

050032593

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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patent: 4700133 (1987-10-01), Day
patent: 4745363 (1988-05-01), Carr et al.
Elphee, E. K., Tachometry in Industry, Industrial Electronics, Nov. 1963, pp. 713-715.

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