Magnetic sensor for determining wear

Details Magnetic sensor for determining wear Magnetic sensor for determining wear

G - Physics

01

N

G01N 27/82 (2006.01)

Patent

CA 2745153

An apparatus and method for detecting wear of a surface of an object One end of the wear sensor is disposed such that it experiences similar wear as the surface of the object to be monitored The sensing element includes a permanent magnet sandwiched between two plates having high magnetic permeability, wherein magnetic poles are oriented perpendicular or parallel to the plates The plates extend beyond the magnet on the side opposite the wear edge forming an air gap such that magnetic flux is concentrated in the plates, with the magnetic circuit being completed through the air gap between the plate extensions A magnetic flux monitoring device may be disposed in the air gap As the magnet and plates of the sensing element are worn away the magnet volume decreases, thereby decreasing the flux density in the air gap which is related to the wear of the surface under investigation

Linvention concerne un appareil et un procédé pour déterminer lusure sur une surface dun objet. Une extrémité du détecteur dusure est disposée de telle sorte quelle subit la même usure que la surface de lobjet à surveiller. Lélément de détection comprend un aimant permanent pris en sandwich entre deux plaques ayant une forte perméabilité magnétique. Selon linvention, les pôles magnétiques sont orientés perpendiculairement ou parallèlement aux plaques. Les plaques sétendent au-delà de laimant sur le côté opposé au bord dusure, formant un entrefer de telle sorte que le flux magnétique est concentré dans les plaques, le circuit magnétique étant complété par lentrefer entre les extensions de la plaque. Un dispositif de surveillance du flux magnétique peut être disposé dans lentrefer. Le volume de laimant diminue à mesure de lusure de laimant et des plaques de lélément de détection, ce qui réduit la densité du flux dans lentrefer qui est en rapport avec lusure de la surface examinée.

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