| 摘要 |
PURPOSE:To provide a method for magnetizing multiple poles which enables a magnetic force line for magnetization to be operated to a permanent magnet efficiently and a rare-earth permanent magnet to be used efficiently in a multiple-pole magnetization of an isotropic cylindrical permanent magnet. CONSTITUTION:A multiple-pole magnetization is performed by allowing a cylindrical or column-shaped back yoke consisting of a soft magnetic material to be inscribed to or fixed to an inner-periphery surface of a cylindrical permanent magnet. Also, when a width of one magnetic pole of a isotropic cylindrical permanent magnet, its coating thickness, and a coating thickness of the back yoke are set to W, T, and t, respectively, T<=0.5W<=2t should be true. A high surface magnetic flux density can be obtained. Since a specified surface magnetic flux density can be secured even if the coating thickness of the isotropic cylindrical permanent magnet is made thin, the permanent magnet can be used efficiently. |
