| 摘要 |
PURPOSE:To reduce an armature reaction without increasing the size by composing field poles by securing a plurality of permanent magnets to a yoke having a circular outer peripheral surface, and forming a hollow air gap corresponding to the positions of the magnets at the yoke. CONSTITUTION:Permanent magnets 2-9 are secured by an adhesive at an equal interval on the outer peripheral surface of a yoke 10 formed in a cylindrical shape on the outer periphery in the circumferential direction, and field poles are composed of the magnets 2-9. A supporting shaft 12 is passed through a hole 11 at the center of the yoke 10, and hollow air gaps 13 are formed corresponding to the positions of the magnets 2-9 between the outer periphery and the hole 11 at the yoke 10. |
