| 摘要 |
PURPOSE:To enable to improve the true circularity of a pole piece in which a coil frame is mounted on a yoke by employing a yoke integrated in a cylindrical shape. CONSTITUTION:Square holes are formed at an equal interval in the number corresponding to the number of poles on the peripheral wall of a yoke 28 integrated in a cylindrical shape. Pole pieces 30 are bent in contact at 180 deg. with an iron plate, a projection is formed at the center, and the both ends are developed in a circular shape. The projections of the pieces 30 are passed trough the hole of a coil frame 29, and the yoke 20 is engaged from the inside with the hole of the yoke 28. |
