12 October 2010 Application of precision harmonic gear drive in focusing mechanism of space camera
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A kind of precision harmonic gear drive in the focusing mechanism of space camera is studied, which adopt external meshing complex wave transmission mode. Wave generator is combined with an elliptic cam and a flexible bearing around it. Flexspline is a structure of single wave with the same teeth. The output shaft is supported by a single crossroller bearing. Ball screws connected the output shaft translate the rotational motion to the linear motion, and drive the focusing mirror repeated moving along the linear guide. The output rigid wheel is connected with absolute encoder to detect displacement of focusing movement. It has the characteristics of big transmission ratio, high precision, compact structure, high efficiency and smooth running etc. According to the practical application of this harmonic gear drive in the space camera, the location relationship between the displacement of focusing structure and the focal plane movement is derived, and the system error is analyzed, its accuracy is tested with the open-loop control method. Experimental results show that transmission ratio of the instrument is 1:70, repeated positional accuracy is 2μm, which meet the requirements for use.
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Xinjie Zhang, Xinjie Zhang, Changxiang Yan, Changxiang Yan, } "Application of precision harmonic gear drive in focusing mechanism of space camera", Proc. SPIE 7659, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Smart Structures and Materials in Manufacturing and Testing, 76590M (12 October 2010); doi: 10.1117/12.866749; https://doi.org/10.1117/12.866749

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