| 摘要 |
An actuator comprises an electric actuating motor, a transmission mechanism and an actuating element, the actuating motor being a DC motor which comprises a first part having permanent magnets and a second part having windings and pole teeth. In order to be able to hold the actuator in any desired, adopted position without any additional apparatuses, the first part ( 30 ) has alternately first zones having a low magnetic field strength ( 31 ) and second zones having a high field strength ( 32 ) over its circumference, the circumferential angle ( 33 ) of the second zones ( 32 ) being equal to the circumferential angle ( 38 ) of the pole teeth ( 37 ) of the second part ( 35 ), the number of pole teeth ( 37 ) being selected such that all of the second zones ( 32 ) are always passed at the same time by a pole tooth ( 37 ), with the result that, in the event of a rotation in the state in which there is no current flowing, a pulsating torque is exerted between the first part ( 30 ) and the second part ( 35 ).
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