Document Type and Number:
Japanese Patent JPS6359523
Kind Code:
B2
Abstract:
The invention relates to a solenoid which functions as a bi-directional linear actuator. …In one embodiment, the solenoid includes a stator (26) having first and second closed flux-carrying paths defined by first and second cores (26, 40), each having a plurality of concentric cylindrical pole surfaces (32, 34 and 36; 43, 44 and 46; respectively) and each defining an air gap (38, 48 respectively) between the outermost of the pole surfaces (32, 43) and the second outermost of the pole surfaces (34, 44). Coils (50, 52, 54, 56, 58 and 60) are provided for generating electromagnetic flux in the first and second closed flux-carrying paths with the direction of flux flow across the air gaps (38, 48) being substantially radial with respect to the cylindrical pole surfaces. …An armature (24) defines a first and a second plurality of concentric cylindrical armature surfaces (73, 74 and 76; 78, 80 and 82; respectively). The armature is mounted to be movable in a direction substantially parallel to the pole surfaces with each of the first and second cylindrical armature surfaces overlapping a corresponding one of the concentric cylindrical pole surfaces by an area dependent upon the position of the armature. The area of overlap between the outermost pole surfaces (32, 43) and their respective armature surfaces (73, 78) is substantially equal to the sum of the areas of overlap between the others of the pole surfaces and their respective armature surfaces. The pole surfaces are defined by tapered ring portions of the stator, which portions have non-uniform cross-sectional areas in the direction parallel to the direction of movement of the armature. Similarly, the armature surfaces are defined by tapered ring portions of the armature with the tapered portions having non-uniform cross-sectional areas in a direction parallel to the direction of movement of the armature. …A plurality of coils (50, 52 and 54; 56, 58 and 60) are used to generate the electromagnetic flux in the cores (26 and 40 respectively).
Application Number:
JP11579980A
Publication Date:
November 21, 1988
Filing Date:
August 22, 1980
Export Citation:
International Classes:
H01F7/16