| 摘要 |
On the inner periphery of the motor's yoke (2), four permanent magnets (4) are equally spaced apart but are not mechanically attached to the yoke itself. Instead, the magnets are securely held in position by spring retainers (3). Each retainer consists of a flat back surface of approx. the same axial length as the permanent magnet poles, with side members (12, 13) raised and spaced apart to give a strong interference fit between the radial side surfaces (71, 72) of the adjacent magnets. The ends of each side member are returned (32) to retain the magnets (4) agatnst movement in an axial direction. The four U-formed retainers are pressed out radially into the space between magnets and secured by plastic bonding to the yoke.
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