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Analysis and experiments of a novel synchronous PM planar motor with minimized cogging force

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Abstract

We deal with analysis and experiments of a novel moving-coil-type synchronous permanent magnet planar motor (SPMPM) with reduced cogging force. Our previous study assumed that the equation of magnetic flux existing between a permanent magnet (PM) and core was a second-order polynomial, and the minimum cogging force was theoretically and geometrically calculated without FE analysis. In this paper, the cogging force of SPMPM with an iron core is calculated exactly using geometrical factors, which are desired for determining the magnetic flux density. The analytical results of the cogging force using the factors agree well with those obtained by FE analysis and experiment. Several methods for reducing the cogging force of the SPMPM, such as separation and arrangement of the iron core, addition of an extra core, and addition of auxiliary core teeth, are introduced in this paper. Velocity control experiments of the SPMPM with modified and unmodified cores are carried out and the results are compared with each other. The velocity ripple of SPMPM with a modified core is much smaller than that of SPMPM with an unmodified core.

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Authors and Affiliations

  1. School of Mechanical Engineering, Yonsei University, Seoul, 120-749, Korea

    Jong Hyun Choi & Yoon Su Baek

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  1. Jong Hyun Choi
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  2. Yoon Su Baek
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Correspondence to Yoon Su Baek.

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Recommended by Associate Editor Sungsoo Rhim

Jong Hyun Choi received the B.S., M.S. and Ph.D. degrees in Mechanical Engineering from Yonsei University, Seoul, South Korea, in 1996, 1998 and 2006, respectively. He is currently a Research Professor at the School of Mechanical Engineering, Yonsei University. His research interests are in the areas of electromechanical system, electromagnetic actuators and magnetic levitation system.

Yoon Su Baek received B.S. and M.S. degrees from Yonsei University, Seoul, Korea, in 1979 and 1981, respectively, and M.S. and Ph.D. degrees from Oregon State University in 1986 and 1990, respectively, all in mechanical engineering. He worked for Samsung Heavy Industry Ltd. as head research engineer at Mechatronics Research Center from 1990 to 1993. Dr. Baek is currently a Professor at the School of Mechanical Engineering at Yonsei University. His research interests are motion devices and robotics, especially relating to multi-D.O.F. actuators. He is also interested in magnetic brake and levitation system.

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Choi, J.H., Baek, Y.S. Analysis and experiments of a novel synchronous PM planar motor with minimized cogging force. J Mech Sci Technol 27, 3463–3471 (2013). https://doi.org/10.1007/s12206-013-0870-8

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  • DOI: https://doi.org/10.1007/s12206-013-0870-8

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