| 摘要 |
PURPOSE:To reduce a core loss of a stator core and to prevent temperature rising of a motor by increasing an opposed interval between a magnet and the stator core to reduce the core loss of the stator core, and providing a stator core projection to the surface opposed to the magnet. CONSTITUTION:A rotor section consisting of a yoke 5 and a magnet 6 to be fixed to a rotary sleeve 3 is fitted and inserted to a shaft 1 through an interval 15, and a stator section consists of a housing 2, the shaft 1 and a stator core 7. A stator core projection 7-1 is provided to the stator core 7, and one part thereof is close to the magnet 6, but the other part of the stator core 7 is such that an interval between the portion and the magnet 6 is larger than before. High magnetic flux density is obtained from the stator core projection 7-1, and thrust directional bearing function is carried out by strong magnetic attraction. Leakage flux increases because of the existence of a recession section S, magnetic flux reaching the stator core 7 is reduced, and the core loss is decreased. |
