| 摘要 |
PURPOSE:To improve the securing strength of a yoke, an auxiliary pole and a plastic magnet and to improve the magnetic characteristics by securing the auxiliary pole and the plastic magnet integrally formed with the auxiliary pole on the inner periphery of the yoke. CONSTITUTION:A stator 1 is formed of a cylindrical yoke 2, an auxiliary pole 3 of soft iron provided on the inner periphery of the yoke, and a plastic magnet 4 injection molded over the entire periphery of the pole 3 similarly on the inner periphery. A plurality of auxiliary poles 3 are secured coaxially and circumferentially at an equal interval on the inner periphery of the cylindrical yoke 2. The magnet 4 is injection molded to the entire inner periphery to enclose the auxiliary pole 3 along the inner periphery from the periphery via the prescribed inner diameter coaxially with the inner periphery of the yoke 2 and to form a thin portion 41 locally thinner than the pole. |
