| 摘要 |
A moving magnet electromagnetic motor wherein the moving magnet is attached to, and moves integrally with, the back iron flux return path portion. The preferred embodiment utilizes a two-pole fixed stator with an energizing coil wrapped about each pole. However, the present invention is applicable to motors with any number of stator pole pieces and energizing coils. Current applied to the energizing coil or coils create a magnetic field which propels the moving magnet and moving back iron combination. The invention is ideal for use as a disc drive read/write head positioning actuator. The invention provides a positioner of reduced size. In addition, the moving magnet and back iron structure doubles as a counterweight to the head structure which simplifies and reduces the size of the disc drive. A further improvement upon the current invention involves embedding the permanent magnet into the back iron flux return path portion, such that the two pieces are substantially coplanar. This improvement further simplifies the motor and reduces its size.
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