| 摘要 |
The invention relates to an actuator comprising an electric control motor, a transmission mechanism and a control element, wherein the control motor is a direct current motor consisting of a first part with permanent magnets and a second part with windings and pole teeth. In order to maintain the actuator in a desired position without requiring additional devices, the first part (30) alternately has first areas of smaller magnetic field strength (31) and second areas of higher field strength (32) over its entire periphery, wherein the peripheral angle (33) of the second areas (32) is identical to the peripheral angle (38) of the pole teeth (37) of the second part (35), wherein the number of pole teeth (37) has been chosen in such a way that a pole tooth (37) always and simultaneously passes through every second area (32) so that a pulsating torque is exerted between the first part (30) and the second part (35) when a rotation takes place in currentless state. |
