| 摘要 |
The invention relates to a device for actuating a control member, particularly a throttle valve in a gas conduit (3), such as for example an intake of an internal-combustion engine, which valve is pivotable from an idling position into operating positions by means of a valve shaft (5), the valve shaft (5) carrying an actuator body formed by a magnetised rotor body (9) which, via an air gap (10), cooperates with pole shoes (15) of a stationary excitation section (11), which is electrically c energisable by a pick-up, which pole shoes surround said rotor body externally, the excitation section (11) comprising a Ushaped stator whose limbs (12a, 12b) form the pole shoes (15), which cooperate with the permanent-magnet rotor body (9) at the air gap, in such a manner that the rotor body (9) is subjected to magnetic torques which tend to pull said rotor body into a well-defined rest position, in order to thereby return the throttle valve (4) in a direction opposite to the opening direction into a well-defined rest position in the non-energised condition.
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