초록 ▼

A valve positioning system according to the present invention includes a force motor which responds to a command signal corresponding to a desired valve flow rate by energizing magnetic coils with a current to produce a flux force which moves the valve. Preferably two Hall effect sensors sense the a

A valve positioning system according to the present invention includes a force motor which responds to a command signal corresponding to a desired valve flow rate by energizing magnetic coils with a current to produce a flux force which moves the valve. Preferably two Hall effect sensors sense the actual position and provide a feedback signal to a control loop which compares the sensed position with the commanded position. The valve is positioned by adjusting the energizing current provided to the magnetic coils. The system optionally includes circuitry to compensate for the error in the actual position relative to the commanded position produced by changes in current in the magnetic coils.

대표청구항 ▼

[ What is claimed is:] [1.] A valve comprising:a housing having a passage to accommodate fluid flow therethrough;a member in said housing movable to relative said passage to vary said flow through said passage;an armature connected to said member being rectilinearly movable within the housing along

[ What is claimed is:] [1.] A valve comprising:a housing having a passage to accommodate fluid flow therethrough;a member in said housing movable to relative said passage to vary said flow through said passage;an armature connected to said member being rectilinearly movable within the housing along an axis to so move said member, means normally biasing said armature in one direction within said housing, one end of said armature forming a first gap with said housing, another end of said armature forming a second gap with said housing, said gaps varying in direct, inverse relationship with one another as said armature moves along said axis;a permanent magnet secured to said housing and disposed about said armature to position said armature along said axis;coil means secured to said housing and disposed about said armature responsive to an energizing current for controlling said movement of the armature against said biasing means;measurement means disposed adjacent one of said first gap and said second gap for measuring a first flux density across said one gap, said measurement means producing a first output signal corresponding to said first flux density;means for sensing said first output signal which represents the position of said armature in said housing and the position of said connected valve member relative to said passage.