| 摘要 |
PURPOSE:To effectively prevent a permanent magnet from separating by disposing the magnet on the outer periphery of a supporting drum, winding a sheetlike binder on the periphery and holding it. CONSTITUTION:A permanent magnetic field rotor has a cylindrical supporting drum 12 secured onto a shaft 11, and four permanent magnets 13 are disposed on the outer periphery. The magnets 13 are secured with an adhesive to the outer periphery. A sheetlike binder 14 is wound over the entire axial direction on the periphery of the magnet 13, a holding member 15 for holding the binder 14 in cooperation with the drum 12 is provided between the two adjacent magnet 13, and a member 16 is contained in the containing slot 16 of the drum 12. The width D1 of the hole 16a at the periphery of the slot 16 is smaller than the width D2 of the member 15, thereby preventing the member 15 from being removed to prevent the magnet 13 from separating due to a centrifugal force. |
