Magnet Position Variation of the Electromagnetic Actuation System in a Torsional Scanner

Authors: Loke Kean Koay, Mani Maran Ratnam

Abstract:

A mechanically-resonant torsional spring scanner was developed in a recent study. Various methods were developed to improve the angular displacement of the scanner while maintaining the scanner frequency. However the effects of rotor magnet radial position on scanner characteristics were not well investigated. In this study, the relationships between the magnet position and the scanner characteristics such as natural frequency, angular displacement and stress level were studied. A finite element model was created and an average deviation of 3.18% was found between the simulation and experimental results, qualifying the simulation results as a guide for further investigations. Three magnet positions on the transverse oscillating suspended plate were investigated by finite element analysis (FEA) and one of the positions were selected as the design position. The magnet position with the longest distance from the twist axis of mirror was selected since it attains minimum stress level, while exceeding the minimum critical flicker frequency and delivering the targeted angular displacement to the scanner.

Keywords: Computer-aided design, design optimization, torsional scanner.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1094086

References:

[1] Dao P., and Dentamaro A., 2003, "Development of a Deployable Aerosol / Water Vapor Lidar to Characterize the Atmosphere,” Proc. SPIE, 5087(781).
[2] Xiang S., Chen S., Wu X., Xiao D., and Zheng X., 2010, "Study on Fast Linear Scanning for a New Laser Scanner,” Opt. Laser Technol., 42(1), pp. 42-46.
[3] Grupp M., Seefeld T., and Vollertsen F., 2003, "Laser Beam Welding with Scanner,” Proc. Second International WLT, Munich, pp. 1-5.
[4] Urey H., 2002, "Torsional MEMS Scanner Design for High-Resolution Display Systems,” Proc. SPIE, 4773(July), pp. 27-37.
[5] Qingkun Z., Ben-Tzvi P., Dapeng F., and Goldenberg A. A., 2008, "Design of Fast Steering Mirror Systems for Precision Laser Beams Steering,” 2008 IEEE International Workshop on Robotic and Sensors Environments, (October), pp. 144-149.
[6] Cochran R. W., and Vassar R. H., 1990, "Fast-Steering Mirrors in Optical Control Systems,” Proc. SPIE, 1303, pp. 245-251.
[7] Burgert O., Treichel T., Dressler C., and Gessat M., 2010, "Storing Data Generated by Optical Surface Scanners Using DICOM- A Work Item Proposal,” Proc. SPIE, 7628, p. 76280D-76280D-10.
[8] Zhou J., Yin H., and Wang Y., 2009, "Research on the Structure and Dynamic Characteristics of a Fast-Steering Mirror,” Proc. SPIE, 7281, p. 72810J-72810J-5.
[9] Aylward R. P., 2003, "Advanced Galvanometer-Based Optical Scanner Design,” Sensor Review, 23(3), pp. 216–222.
[10] Hii K.-fu, Vallance R. R., and Mengüc M. P., 2010, "Design , Operation , and Motion Characteristics of a Precise Piezoelectric Linear Motor,” Precision Engineering, 34, pp. 231-241.
[11] Mason P., Hill M., and Ses- G., 1981, "Piezoelectricity , Its History and Applications,” Journal of Acoustical Society of America, 70(6), pp. 1561-1566.
[12] Remy M., Lemarquand G., Castagnede B., Guyader G., and Renault T., 2008, "Ironless and Leakage Free Voice-Coil Motor Made of Bonded Magnets,” IEEE Transactions on Magnetics, 44(11), pp. 4289-4292.
[13] Jung K. S., and Baek Y. S., 2002, "Development of a Novel Maglev Positioner with Self-Stabilizing Property,” Mechatronics, 12, pp. 771-790.
[14] Koay L. K., and Gitano-Briggs H., 2011, "Design and Optimization of Mechanically Resonant Torsional Spring Mechanism for Laser Light Dispersion Applications,” ASME J Mech. Des., 133(1), p. 014504.
[15] Park J., Lee S., and Kwak B. M., 2012, "Design Optimization of Piezoelectric Energy Harvester Subject to Tip Excitation,” Journal of Mechanical Science and Technology, 26(1), pp. 137-143.
[16] Kheng L. B., Kean K. L., and Gitano-Briggs H., 2010, "Design Optimization and Fatigue Testing of an Electronically-Driven Mechanically-Resonant Cantilever Spring Mechanism,” Int. J. Mater. Des., 31(8), pp. 4023-4028.
[17] Greenwood V. J., Smith E. L., Goldsmith A. R., Cuthill I. C., Crisp L. H., Walter-swan M. B., and Bennett A. T. D., 2004, "Does the Flicker Frequency of Fluorescent Lighting Affect the Welfare of Captive European Starlings ?,” Applied Animal Behaviour Science, 86, pp. 145-159.
[18] Becker C., and Elliott M. A., 2006, "Flicker-Induced Color and Form : Interdependencies and Relation to Stimulation Frequency and Phase,” Consciousness and Cognition, 15, pp. 175-196.
[19] Todd B., Jensen B. D., Schultz S. M., and Hawkins A. R., 2010, "Design and Testing of a Thin-Flexure Bistable Mechanism,” Journal of Mechanical Design, 132(July), pp. 1-7.
[20] He N., Jia W., and Huang L., 2006, "Design and Mechanism Analysis of a Novel Type Compact Single Mirror Laser Scanner,” Sensors And Actuators, 125, pp. 482-485.
[21] Kang D., Kim K., Kim D., Shim J., Gweon D.-G., and Jeong J., 2009, "Optimal Design of High Precision XY-Scanner with Nanometer-Level Resolution and Millimeter-Level Working Range,” Mechatronics, 19(4), pp. 562-570.
[22] Balachandran B., and Magrab E. B., 2004, Vibrations, Belment: Thomson Learning.
[23] Young W. C., and Budynas R. G., 2002, Roark’s Formulas for Stress and Strain, McGraw-Hill, New York.
[24] P. Beer F., and Russell, E. J., 1985, Mechanics for Engineers-Dynamics, McGraw-Hill, United States of America.
[25] Cheng F.-H., 1997, Statics and Strength of Materials, McGraw-Hill, New York.
[26] Scott-emuakpor O., Shen M. H., and Cross C. J., 2007, "Development of an Improved High Cycle Fatigue Criterion,” Journal of Engineering for Gas Turbines and Power, 129(January), pp. 162-169.
[27] Asada N., Takeuchi M., Vaganov V., and Belov N., 2000, "Silicon Micro-Optical Scanner,” Sensors and Actuators A: Physical, 83(1-3), pp. 284–290.
[28] Mesmacque G., and Farfa S., 2004, "High Cycle Fatigue , Low Cycle Fatigue and Failure Modes of a Carburized Steel,” International Journal of Fatigue, 26, pp. 673-678.