Spool position indicator

Details Spool position indicator Spool position indicator

F - Mech Eng,Light,Heat,Weapons

15

B

F15B 13/16 (2006.01) F15B 13/043 (2006.01) F16K 37/00 (2006.01) G01B 7/00 (2006.01) G01D 5/14 (2006.01)

Patent

CA 2085436

An electro hydraulic servo valve has a pair of oppositely polarized magnets mounted in the surface of the spool of the valve to be controlled. A Hall effect sensor is mounted in the housing adjacent the magnets to precisely measure the position of the spool relative to the housing. The magnets and transducer are mounted on the longitudinal centerline of the spool to eliminate the spurious signals, due to temperature, vibrations, shock, hydraulic supply pressure and back pressure. The strength and spacing of the magnets and air gap are chosen to provide a linear output signal over the range of displacement desired and to provide the accuracy of location necessary for the particular configuration.

Servovalve électrohydraulique comportant une paire d'aimants à polarité inverse montés à la surface de la bobine à commander. Un capteur d'effet Hall est monté dans le boîtier de la servovalve, à proximité des aimants, pour mesurer de façon précise la position de la bobine par rapport au boîtier. Les aimants et le transducteur sont montés suivant l'axe longitudinal de la bobine afin d'éviter les signaux parasites causés par la température, les vibrations, les chocs et la pression hydraulique d'alimentation et de retour. La tension des aimants, leur espacement et l'entrefer sont choisis en vue d'obtenir un signal de sortie linéaire pour la plage de mouvement considérée et un positionnement précis.

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