| 摘要 |
PURPOSE:To suppress a leakage magnetic flux at the axial end by disposing a contact plate of a magnetic material at the axial end of a rotary core, and forming the opposed portion of the plate with the adjacent portion of permanent magnets smaller than the outer diameter of a rotor core. CONSTITUTION:A plurality of permanent magnets 2 are disposed on the outer periphery of a cylindrical rotor core 1 made of a magnetic material, and contact plates 4 are disposed at both side ends of the core 1. The plates 4 have projections 4a on the outer periphery, and the outer diameter P except the projection 4a is formed equal to or smaller than the outer diameter Q of the core 1. The projections 4a are disposed only at the axial end of the magnets 2, but not provided at the adjacent portions 10 of the magnets 2. |
