초록 ▼

An electropneumatic motor includes an electrically energizable magnetic circuit with an armature resiliently suspended in the air gap defined between two opposed pole pieces of differing dimensions. One of pole pieces includes an axially adjustable member of magnetic material. A fluid nozzle is carr

An electropneumatic motor includes an electrically energizable magnetic circuit with an armature resiliently suspended in the air gap defined between two opposed pole pieces of differing dimensions. One of pole pieces includes an axially adjustable member of magnetic material. A fluid nozzle is carried by the other pole piece. Axial adjustment of the pole piece member affects the strength of the magnetic field. In one embodiment, the pole piece member includes a permanent magnet, which is axially movable relative to the armature, centered in the face of the pole piece. The combination of the fixed field from the permanent magnet and the electromagnetically induced variable field helps more nearly linearize the current to armature force relationship and increases the force on the armature. To determine the operating point of the motor, the suspension for the armature can be prestressed to force it as close as possible to the nozzle, and the magnet can be advanced until the armature is pulled off of the nozzle.

대표청구항 ▼

[ What is claimed is:] [1.] A current to pressure converter for converting an input current signal to an output pressure signal, comprising:a magnetic circuit;two pole pieces having opposing pole faces of different dimensions defining therebetween an air gap in said magnetic circuit;a magnetically r

[ What is claimed is:] [1.] A current to pressure converter for converting an input current signal to an output pressure signal, comprising:a magnetic circuit;two pole pieces having opposing pole faces of different dimensions defining therebetween an air gap in said magnetic circuit;a magnetically responsive armature resiliently suspended in the air gap;a pressurized fluid line having an inlet and an outlet;one of said pole pieces having a nozzle extending through the pole face of said pole piece in direct fluid communication with said pressurized fluid line between the inlet and outlet thereof so as to vent fluid in the fluid line through the nozzle, said nozzle being arranged relative to said armature so that fluid exiting the nozzle impinges on said armature;the other one of said pole pieces including an axially adjustable magnetic member in the vicinity of the pole face;an electrical coil assembly surrounding one of said pole pieces for energizing the magnetic circuit so as to force the armature to move closer to or farther away from the nozzle in order to block the fluid exiting the nozzle with the armature itself more or less, resulting in a concomitant increase or decrease in the pressure of the fluid at the outlet of said fluid line as a direct function of the level of electrical current flowing in said coil assembly.