CYCLIC COIL-TYPE PERMANENT-MAGNET LINEAR MOTOR AND SYRINGE PUMP DRIVING DEVICE USING SAME AS DRIVING SOURCE

摘要

PROBLEM TO BE SOLVED: To provide a linear motor, especially a linear stepping motor that generates high thrust, produces low noise, and is simple in structure and low cost.;SOLUTION: An armature and a cylindrical member that can be moved relative to each other and a shaft that holds them are arranged concentrically, and the armature is formed by coaxially disposing a plurality of unit armatures, having a pair of armature yokes that are formed of cyclic coils and a magnetic material and are provided so that the cyclic coils are clamped between them. The armature yokes are provided on their inner circumferential surfaces, with annular magnetic teeth shaped alternately recessed and projected in the axial direction or an annular permanent magnet annularly and alternately magnetized to NS poles in the axial direction. The armature yokes are provided with a cylindrical member. The cylindrical member faces the annular magnetic teeth or the cylindrical permanent magnet via a small gap in-between and is provided on its outer circumferential surface with a cylindrical permanent magnet shaped annularly and alternately magnetized in the north pole and in the south pole in the axial direction or a cylindrical member, having annular magnetic teeth shaped alternately recessed and projected in the axial direction. The linear motor is so constituted that the armature and the cylindrical member can be moved freely relative to each other by the passage of current through the cyclic coils of the armature.;COPYRIGHT: (C)2005,JPO&NCIPI