| 摘要 |
<p>Actuator (10), particularly for motor vehicle powered door locking systems, utilises a solenoid (12) exemplified in the figure whose poles coact with poles of permanent magnets (16, 18). Relative movement between the solenoid and magnets shifts a plunger (14) or lever to provide drive output. The solenoid is switched to give magnetic polarity at a solenoid pole coacting with a first permanent magnet pole (16a) unlike opposite to the polarity of the latter to provide an attractive force, while at the same time making the polarity of another solenoid pole which coacts with a second permanent magnet pole (18a) of like polarity to the latter to provide a repulsive force in the same direction. The plunger or the like is returned by reversing the current direction in the solenoid, driving the magnets in the opposite direction. A latching action holding the element at the selected position even when the solenoid is de-energised is provided by the engaged permanent magnet pole.</p> |
