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Appl. Sci. 2016, 6(2), 52; doi:10.3390/app6020052

Adaptive Control of Active Magnetic Bearing against Milling Dynamics

Department of Mechanical Engineering, National Chin-Yi University of Technology, No. 57, Sec. 2, Zhongshan Rd., Taiping Dist., Taichung 41170, Taiwan
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Author to whom correspondence should be addressed.
Academic Editor: Chih Jer Lin
Received: 27 November 2015 / Revised: 8 January 2016 / Accepted: 28 January 2016 / Published: 15 February 2016

Abstract

For improving the defects in milling processes caused by traditional spindle bearings, e.g., the dimensional discrepancy of a finished workpiece due to bearing wear or oil pollution by lubricant, a novel embedded cylindrical-array magnetic actuator (ECAMA) is designed for milling applications. Since ECAMA is a non-contact type actuator, a control strategy named fuzzy model-reference adaptive control (FMRAC) is synthesized to account for the nonlinearities of milling dynamics and magnetic force. In order to ensure the superior performance of spindle position regulation, the employed models in FMRAC are all constructed by experiments. Based on the experimental results, the magnetic force by ECAMA is much stronger than that by the traditional active magnetic bearing (AMB) design under the same test conditions and identical overall size. The efficacy of ECAMA to suppress the spindle position deviation with the aid of FMRAC has been verified as well via numerical simulations and practical metal cutting. View Full-Text
Keywords: active magnetic bearing; milling; adaptive control active magnetic bearing; milling; adaptive control
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Lee, R.-M.; Chen, T.-C. Adaptive Control of Active Magnetic Bearing against Milling Dynamics. Appl. Sci. 2016, 6, 52.

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