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Two-DOF actuator module design and development based on fully decoupled parallel structure

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Abstract

This paper presents a two-DOF actuator module for weight device manipulations. Minimum requirements for a two-DOF actuator module are high accurate positioning, long stroke motion, and fully motion decoupling to utilize standalone stage. Also, the shape and compactness should be considered to utilize for kinematic linkage of the parallel manipulator. In order to achieve minimum requirements, we proposed the fully decoupled parallel structure that is a kind of the motion converting mechanism consisting of reduction unit, decoupling unit, primary motion unit, and secondary motion unit. Moreover, we utilized conventional mechanical components to assemble mechanical units. The conventional mechanical components commonly involve undesired motions such as straightness error, flatness error, angular runout, and backlash. To minimize the undesired motion, we design the final prototype of actuator module by considering preload and paired joint in all of the motion components. Finally, to validate system performance, we performed several experimental tests, namely, positioning accuracy, closed-loop control response, and axis selection. The results show root mean square error 45 nm and standard deviation 44 nm.

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Acknowledgments

This work was supported by the Global Frontier R&D Program on Human-centered Interaction for Coexistence funded by the National Research Foundation of Korea Grant funded by the Korean Government(MSIP) (NRF-M1AXA003-2010-0029748) and the convergence technology development program for bionic arm through the National Research Foundation of Korea(NRF) funded by the Ministry of Science, ICT & Future Planning (No. 2014M3C1B2048419).

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Correspondence to Yong Seok Ihn.

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Parts of this paper were presented at the 2012 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS 2012), Vilamoura-Algarve, Portugal, October, 2012.

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Ihn, Y.S. Two-DOF actuator module design and development based on fully decoupled parallel structure. Microsyst Technol 24, 1359–1368 (2018). https://doi.org/10.1007/s00542-016-3018-9

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  • DOI: https://doi.org/10.1007/s00542-016-3018-9

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