| 摘要 |
PURPOSE:To reduce the number of rotating speed of bases by forming a sectional shape perpendicularly crossing a rotating central axis of the armature of a slot in a converged shape at the end of the armature rotating center shaft side. CONSTITUTION:A plurality of slots 13 are formed at the prescribed interval in the circumferetial direction, an armature winding 14 is disposed in the slot 13 to form an armature 11. The slot 13 is formed in a trapezoidal shape that the sectional shaft perpendicularly crossing the armature rotating center shaft 12 is converged at the end of the armature rotating center shaft 12 side. Thus, the slot can be deeply formed without reducing the area of a magnetic path, thereby reducing the rotating speed of a base. |
