Patent ID: 7582991
Filing Date: 2009-09-01
Classification: H02K

Abstract:
1. A linear motor which includes a stator and a movable element comprising: a magnetic pole row constituted from a plurality of permanent magnets arranged in a row; and an armature including an armature core having a plurality of first magnetic pole portions and a plurality of second magnetic portions, and a plurality of winding portions which are respectively wound with the winding conductor and provided on the plurality of first magnetic pole portions, the plurality of first magnetic pole portions each including a wound portion which is wound with the winding conductor, a non-wound portion which is not wound with the winding conductor and is integrally provided at each end of the wound portion, and a magnetic pole surface constituent portion which is connected to the non-wound portion and is opposed to the magnetic pole row; the plurality of second magnetic pole portions which are not wound with the winding conductor, each including a magnetic pole center portion which faces the wound portions of one or more of the first magnetic pole portions located adjacent to the second magnetic pole portion, a magnetic pole end portion which is integrally formed with the magnetic pole center portion at each end of the magnetic pole center portion and faces the non-wound portions of the one or more first magnetic pole portions located adjacent to the second magnetic pole portion, and a magnetic pole surface constituent portion which is integrally formed with the magnetic pole end portion and is opposed to the magnetic pole row; the first magnetic pole portions and the second magnetic pole portions being extended in an opposing direction in which the stator and the movable element are opposed to each other, and the first magnetic pole portions and the second magnetic pole portions being alternately arranged at a predetermined interval in a moving direction of the movable element so that the second magnetic pole portion is located at each end of the armature core in the moving direction of the movable element; the magnetic pole surface constituent portion of the first magnetic pole portion, and the magnetic pole surface constituent portion of the second magnetic pole portion that are located adjacent to each other being connected with a connecting portion; and the magnetic pole surface constituent portions of the plurality of first magnetic pole portions, the plurality of second magnetic pole portions, and the connecting portions being integrally formed with one another; wherein dimensions of the magnetic pole surface constituent portions of the first magnetic pole portions in an orthogonal direction orthogonal to the moving direction and the opposing direction are equal to dimensions of the second magnetic pole portions in the orthogonal direction; wherein end surfaces of the wound portion of the first magnetic pole portion are located more inwardly in the orthogonal direction than end surfaces of the second magnetic pole portion; wherein an armature core main portion except the wound portions and the non-wound portions of the plurality of first magnetic pole portions is constituted by stacking in the orthogonal direction a plurality of magnetic steel sheets formed in a predetermined shape; and wherein the stator is provided with one of the magnetic pole row and the armature, and the movable element is provided with the other of the magnetic pole row and armature.