| 摘要 |
An actuator includes an upper stator with four upper poles and a lower stator with four lower poles aligned with the four upper poles. A permanent magnet is attached to the upper stator and the lower stator. Four moving armatures are positioned at terminal ends of the four upper poles and the four lower poles. Coils are wrapped around the upper stator and the lower stator. A controller selectively applies current to the coils to migrate flux created by the permanent magnet through selective poles of the upper stator and the lower stator and thereby alter the size of air gaps associated with the four moving armatures.
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