Patent ID: 8350419

Claim:
A single-shaft linear motor provided with a magnetic body and an armature, the single-shaft linear motor adapted to produce a force causing the magnet body and the armature to be relatively displaced along a given linear moving direction by interaction of magnetic fluxes generated between the magnetic body and the armature during an operation of supplying electric power to the armature, comprising: a base plate having a thin tray-shape, said base plate being adapted to set the moving direction on a base surface thereof; a movable section attached to the base plate in such a movable manner as to relatively reciprocate along the moving direction with respect to the base plate; a mover provided on a lateral surface of the movable section with respect to one side of a widthwise direction of the base surface, said widthwise direction is perpendicular to the moving direction and to a perpendicular direction that is perpendicular to the base surface, the mover formed as one of the magnetic body and the armature; a stator provided on the base surface of the base plate to be disposed opposed to the mover from a one edge side toward another edge side in the widthwise direction so as to downsize the linear motor in the perpendicular direction to allow the linear motor to have a thin structure, the stator formed as the other one of the magnetic body and the armature to extend along the moving direction; a standing wall provided on an outer peripheral edge of the base plate at least at a position which is along the moving direction, to define a containing space in cooperation with the base surface, the containing space being opened to allow the stator, the mover, and the movable section to be selectively mounted therein and removed therefrom in a direction perpendicular to the base surface; at least a sub-tooth provided on the base surface of the base plate, said sub-tooth is adapted to reduce the cogging-force which occurs during the operation; and a magnetic plate provided between the base plate and said sub-tooth, said magnetic plate is adapted to supplement the cogging-force reducing effect by the sub-tooth.