Abstract
An omni-directional driving system with one spherical wheel is proposed in this paper. This system can overcome the limitations of existing driving systems, such as structural limitations that reduce vertical, horizontal, and diagonal movements. The proposed driving system is composed of two stepper motors, a steel ball covered by steel ball bearing, a counterweight to eliminate eccentricity, and ball plungers for balance. All parts of this structure are located at the same distance from the center of the system to place the center of gravity at the system center. The ball bearing was designed for even rotation and smooth directional changes of the spherical wheel using a model similar to that in a computer mouse ball. Steel was selected for the ball bearing material to prevent slipping on the ground. Moreover, the steel ball is stable because of the support from the ball bearing. One of the stepping motors is used for driving the spherical wheel. The other stepping motor enables movement in the desired direction by rotating on the central axis. The ATmega128 microcontroller is used for controlling the two stepping motors. Driving experiments were executed in a variety of environments, confirming the performance and validity of the omni-directional driving system.
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This paper was presented at the FEOFS 2013, Jeju, Korea, June 9–13, 2013. Recommended by Guest Editor Jung-Il Song
Hyun-seok Lee received his B.S. degree from the Department of Mechanical Engineering in Changwon National University in 2012. His research interests include 3D printers and biomimetic robot design.
Jong-kyu Park received his B.S., M.S. and Ph.D. degrees from the Department of Mechanical Engineering in POSTECH in 2000, 2002, and 2007, respectively. He has been a professor in School of Mechanical Engineering in Changwon National University since 2008. His research interests include piezoelectric sensors and actuators as well as biomimetic mechatronics design.
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Lee, H., Na, Y., Park, T. et al. Fabrication of omni-directional driving system using unconstrained steel ball. J Mech Sci Technol 29, 93–97 (2015). https://doi.org/10.1007/s12206-014-1214-z
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DOI: https://doi.org/10.1007/s12206-014-1214-z