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Title: A polymer-based air gap length prediction method with current injection and fuzzy logic observer
Authors: Zou, Y 
Cheng, KWE 
Cheung, NC 
Pan, JF
Keywords: Air gap length
Current pulse injection
Fuzzy logic observer
Issue Date: 2017
Publisher: Institute of Electrical and Electronics Engineers
Source: IEEE transactions on magnetics, 2017, v. 53, no. 11, 2002404 How to cite?
Journal: IEEE transactions on magnetics 
Abstract: In this paper, an approach combining current pulses injection and fuzzy logic observer to measure the air gap length of linear machines is proposed. A polymer enclosed by a coil is produced and selected as the test object. The characteristics and production process for the polymer is introduced and its magnetic feature has been studied. Injecting current pulses is used to calculate the self-inductance of the coil fixed on the cores that is directly influenced by the air gap length from the polymer. By using a fuzzy logic observer, the air gap length can be estimated precisely according to the variations of the self-inductance. Experimental results show the effectiveness of the proposed measurement method and the results prove that the proposed method is suitable for the air gap measurement for linear machines.
Description: IEEE International Magnetics Conference (Intermag), Dublin, Ireland, Apr 24-28, 2017
ISSN: 0018-9464
EISSN: 1941-0069
DOI: 10.1109/TMAG.2017.2707072
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