| 摘要 |
A mechanical actuator includes an annular electromagnet and a ferromagnetic plunger disposed within a bore of the electromagnet and slidable therein. A first permanent magnet is positioned outside of the bore and in facing relation to a first end face of the plunger, and a second permanent magnet is positioned outside of the bore and in facing relation to the second end face of the plunger. The plunger is slidable in the bore between a first position with the first end face adjacent to the first permanent magnet and a second position with the second end face adjacent to the second permanent magnet. Activation of the electromagnet with the current flowing in a first direction drives the plunger toward the first permanent magnet, where it is retained. Activation of the electromagnet with the current flowing in a second (opposite) direction drives the plunger away from the first permanent magnet and toward the second permanent magnet, where it is retained.
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