Fluid handling – Systems – Plural noncommunicating flow paths
Patent
1987-10-20
1989-01-10
Michalsky, Gerald A.
Fluid handling
Systems
Plural noncommunicating flow paths
13759617, 137870, 2511292, 335268, F16K 1114
Patent
active
047966645
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates generally to the field of electro-mechanical force motors, and, more particularly, to an improved force motor for converting one or more electrical signals into omni-directional pivotal movement of an armature relative to a body.
BACKGROUND ART
A force motor is an electro-mechanical device for converting an electrical signal into a desired physical displacement of a member. Such a force motor, sometimes called a "torque motor" if a force acts at an arm distance from a pivot point, has been widely used in electrohydraulic servovalves. In such applications, the electrical signal may represent either a command signal or an error signal supplied to the servovalve. For example, such a motor may be used to displace an armature-flapper member between two opposing nozzles through which fluid is discharged (see, e.g., U.S. Pat. Nos. 2,767,689 and 3,023,782), or a jet pipe through which fluid is discharged toward a plurality of receiver openings (see, e.g., U.S. Pat. Nos. 3,542,051 and 3,612,103). In these earlier applications, however, it was only necessary to displace the member in one plane.
DISCLOSURE OF THE INVENTION
The present invention provides an improved force motor in which an armature is mounted for omni-directional pivotal movement relative to a body.
The improved motor broadly includes: a body; an armature mounted on the body for omni-directional pivotal movement relative thereto, this armature being elongated along an axis; a centering device acting between the body and armature for urging the armature to move to a null position, at which the armature axis will be coincident with a line defined by the intersection of two planes; at least one first coil mounted on the body and selectively energizable to cause the armature to pivot in one of the planes; and at least one second coil mounted on the body and selectively energizable to cause the armature to pivot in the other of the planes; whereby these coils may be selectively energized, either individually or in combination with one another, to cause the armature to selectively pivot off-null in a desired direction and for a desired distance.
Accordingly, the general object of the invention is to provide an improved force motor.
Another object is to provide an improved force motor in which an armature may be pivoted omni-directionally relative to a body.
Another object is to provide an improved force motor in which an armature may be pivoted omni-directionally by a magnitude proportional to the supplied current.
Still another object is to provide an improved two-axis force motor having a pivoted armature movable off-null in any desired angular direction to selectively control the operation of a plurality of actuators sensitive to the position of the armature.
These and other objects and advantages will become apparent from the foregoing and ongoing written specfication, the drawings, and the appended claims.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a fragmentary schematic vertical sectional view of a first preferred form of the two-axis force motor.
FIG. 2 is an enlarged view of the body shown in FIG. 1.
FIG. 3 is an enlarged view of the armature shown in FIG. 1.
FIG. 4 is a horizontal sectional view, taken generally on line 4--4 of FIG. 1, showing the arms of the armature as being encircled by the coils.
FIG. 5 is a horizontal sectional view, taken generally on line 5--5 of FIG. 1, showing the valve members engaging the armature, and showing the armature in its null position.
FIG. 6 is a fragmentary schematic vertical sectional view of a second preferred form of the improved two-axis force motor, this view being taken generally on line 6--6 of FIG. 9.
FIG. 7 is an enlarged view of the body shown in FIG. 6.
FIG. 8 is an enlarged view of the armature shown in FIG. 6.
FIG. 9 is a horizontal sectional view, taken generally on line 9--9 of FIG. 6, showing the armature in its null position between the polepieces.
FIG. 10 is a horizontal sectional view, taken generally on line 10--10 of FIG. 6, showing
REFERENCES:
patent: 4428558 (1984-01-01), Idogaki et al.
patent: 4546338 (1985-10-01), Idogaki et al.
patent: 4600871 (1986-07-01), Idogaki et al.
Michalsky Gerald A.
Moog Inc.
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