Modeling of the Holding Force in an Electromagnetic Chuck

[+] Author and Article Information
Alejandro Felix, Shreyes N. Melkote

The George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, GA 30332-0405

Yoichi Matsumoto

The Timken Company, Canton, OH 44706-0930

J. Manuf. Sci. Eng 122(3), 569-575 (Nov 01, 1999) (7 pages) doi:10.1115/1.1286259 History: Received May 01, 1999; Revised November 01, 1999
Copyright © 2000 by ASME
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DeStefani, J. D., 1994, “Magnetic Chucks Attract New Users,” Tooling and Production, Vol. 60, No. 1, pp. 61–64.
Barton,  S. C., 1997, “Magnetic Workholding for Milling and Turning,” Mach. Sci. Technol. SME, 8, No. 1, pp. 1–17.
Felix, A., and Melkote, S. N., 1998, “Effect of Workpiece Flatness and Surface Finish on the Holding Force in a Magnetic Chuck,” Proceedings of the ASME, Manufacturing Science and Engineering, MED-Vol. 8, pp. 925–931; to also appear in J. of Manufac. Sci. and Eng.
Saito,  Y., Nishiwaki,  N., Ootani,  T., Okimoto,  K., Fleming,  R., 1985, “Study on the Chucking Force of an Electro-Magnetic Chuck,” Bulletin of the JSME, 28, No. 237, pp. 515–522.
Law, J. D., Busch, T. J., Lipo, T. A., 1996, “Magnetic Circuit Modeling of the Field Regulated Reluctance Machine Part I: Model Development,” IEEE Transactions on Energy Conversion, Vol. 11, No. 1, pp. 49–55.
Sen, P. C., 1989, Principles of Electric Machines and Power Electronics, John Wiley & Sons.
ASTM Standards A 773/A 773M-96, 1996, Standard Test Method for DC Magnetic Properties of Materials Using Ring and Permeameter Procedures with DC Electronic Hysteresisgraphs, ASTM, pp. 1–10.
ANSYS Theory Reference, 1997, Electromagnetics, Ch. 5, 8th Edition, SAS IP, Inc.
Felix, A., 1999, Characterization and Modeling of a Magnetic Workholding Device, M.S. Thesis, Woodruff School of Mechanical Engineering, Georgia Institute of Technology, Atlanta, Georgia.


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Leakage flux at 4.5 Amp - 0.1 mm airgap
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Principle of operation of a magnetic chuck
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Schematic of the 4-pole chuck and workpiece
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Magnetic circuit for 1/4 model of chuck-workpiece system
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Chuck geometry: (a) actual, (b) approximate
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Geometric approximation of the workpiece
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Calculation of the mean magnetic path
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Algorithm for solution of flux in the magnetic circuit model
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Schematic of the experimental setup
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Workpiece geometry used in experiments
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B-H curves for the chuck and workpiece material
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Normal holding force vs. airgap length for different coil currents
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Measured versus predicted normal holding force—no shim case
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3-D mesh used for the 4-pole chuck model
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Measured and predicted holding force using the finite element model-0.1 mm airgap
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Cross section used to display leakage effects
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Leakage flux at 1 Amp - 0.1 mm airgap



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