Sensing device for detecting the rotational speed of a rotating

Details Sensing device for detecting the rotational speed of a rotating Sensing device for detecting the rotational speed of a rotating

1991-12-30

1994-03-08

Snow, Walter E.

Electricity: measuring and testing

Electrical speed measuring

Including speed-related frequency generator

324174, 32420722, G01P 348, G01P 354, G01B 714

Patent

active

052931242

ABSTRACT:
Device for sensing the rotational speed of a rotating element (4) mounted by means of a roller bearing on a non-rotating element (3), comprising a multipolar ring (17) which is integral with the rotating element, a sensor (19) which is made integral with the non-rotating element, and a magnetic flux concentrating means arranged in the immediate vicinity of the multipolar ring and cooperating with the sensor in order to concentrate and channel the magnetic flux emitted by the multipolar ring. The flux concentrating means is of annular shape and comprises at least a first end shield (24) having a radial part of which one circular edge is provided on its circumference with a sealing lip (25) intended for coming into contact directly or indirectly with the rotating element (4), and a second end shield (26) provided with radial teeth (27) spaced regularly along a circular path. The multipolar ring is axially magnetised and arranged in the axial space included between the radial part of the first end shield on the one hand and the radial teeth of the second end shield on the other hand, so that the radial teeth are all situated axially opposite the magnetic poles of the same polarity of the multipolar ring.

REFERENCES:
patent: 4988220 (1991-01-01), Christiansen
patent: 5004358 (1991-04-01), Varuello et al.

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