| 摘要 |
PURPOSE:To miniaturize the title motor at large torque by disposing a permanent magnet on the rotor side, increasing magnetic flux density and supplying a tooth section between a stator and a rotor with magnetic flux. CONSTITUTION:A rotor 2 is arranged, surrounding a cylindrical stator 1. A hole 15 is formed at the central section of the stator 1, a peripheral section has a stator core 8 in which an electromagnetic steel plate such as an silicon steel plate is laminated, and windings 9 having each phase are wound on the stator core 8. Projecting teeth 12 are shaped to the outer circumferential surface of the stator core 8. A rotor yoke 3 is mounted onto the outer circumferential section of the rotor 2, and two permanent magnets 4, 5 are fixed at a regular interval in the axial direction of an inner circumferential surface. Rotor cores 6, 7 are each fastened to the magnets 4, 5, and rotor teeth 10 are formed to the projecting section. Accordingly, magnetic flux generated in the permanent magnets 4, 5 shapes a magnetic path 14 passing through the stator core 8, the other magnet 5, etc., from one magnet 4, and the rotor 2 is turned by the magnetic flux and magnetic flux caused by the currents of the windings 9.
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