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22대 대한민국 국회 국회정보길라잡이 국회의원검색
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 In this paper, we developed of large Range Fine Actuator for the segmented mirror pose control. This actuator uses the Tumbler coupler employed in the James Webb Space Telescope (JWST) to achieve both large displacement motion and fine motion with a single actuator. The fine motion is achieved by generating a Sine waveform motion through the combination of a Compound flexure and an eccentric cam, utilizing a specific linear section of this motion for fine adjustments. The coarse motion employs a Nut moving method, achieving stable linear motion through high structural rigidity. Recognizing the time and cost difficulties in machining parts such as gears, lead screws, and bearings from materials withexcellent thermal and mechanical properties, we instead fabricated the actuator using commercially available parts that can operate in extreme cold and vacuum conditions.

The required torque for each stage of the large Range Fine Actuator was calculated based on the Load and Position conditions of the Coarse and Fine motion, and an appropriate Step motor was selected. The motion range of the Fine stage was set considering its relationship with the coarse motion, and a Harmonic profile, which is easier to process, was used for the cam profile. The reduction ratio of the Reducer was determined considering the motion range of the Fine stage and the lift of the cam. After the design was completed, the performance of the large Range Fine Actuator's Fine motion and coarse motion was measured and evaluated to verify its performance.

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