| 摘要 |
PROBLEM TO BE SOLVED: To provide a labyrinth structure which can prevent foreign matters from invading a clearance in a magnetic circuit with a simple structure without using additional member or any sacrifice in its posture. SOLUTION: This stator is constituted by forming a ring labyrinth member 7 out of resin integrally with a stator base 1 involving a printed circuit board 2 through a rotor holder 4 and a plurality of jointing pieces 6 radially extending from the rotor holder 4. It is desirable that a magnetic detection element H or the like should be disposed between the jointing pieces 6. By accommodating the jointing pieces 6 between a plurality of armature coils 8a, it is possible to make effective use of a dead space. |
