| 摘要 |
PURPOSE:To increase the number of poles and to enhance the surface magnetic flux density by forming a plurality of grooves at an equal interval on the outer periphery of a cylindrical magnetic core, and engaging circumferentially magnetized block-shaped permanent magnets in the respective grooves. CONSTITUTION:A bush 2 is engaged with a cylindrical core 1 made of a magnetic material, and a rotational shaft 3 is inserted fixedly to the inner surface. A plurality of grooves 5 are formed at an equal interval on the outer periphery of the core 1 along the circumferential direction. Block-shaped permanent magnets 5 are respectively secured to the grooves 4. The magnets are circumferentially magnetized, and so arranges as to oppose the poles of the same polarity. Since the magnets 5 and used, a rotor which has 100 or more poles can be readily obtained by reducing the thickness (t) of the magnets 5. |
