| 摘要 |
An actuator ( 20 ) comprises a rotor ( 22 ); an electromagnetic circuit ( 24 ) configured to produce bidirectional torque on the rotor; and, a rotation limitation assembly ( 26 ). The rotor ( 22 ) comprises a rotor shaft and plural magnets ( 80 ) affixed to the rotor shaft. In an example embodiment the rotation limitation assembly ( 26 ) comprises at least one stationary clockwise boundary ( 40 ) configured to limit clockwise rotation of the rotor ( 22 ); at least one stationary counterclockwise boundary ( 42 ) configured to limit counterclockwise rotation of the rotor ( 22 ); and a rotor stop arm ( 50 ) connected to the rotor and configured to selectively abut the clockwise boundary ( 40 ) and the counterclockwise boundary ( 44 ) and thereby limit the rotation of the rotor to a predetermined angle about an axis of the rotor shaft.
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