Improvement Methods of Apparent Permeability of Ferromagnetic Core

Abstract:

The performance of induction coil magnetic sensors , which usually have large dimensions and heavy weights, is mainly decided by apparent permeability of the core. But flux concentrator is a effective equipment to improve apparent permeability of the core, which will hardly increase dimensions and weights of magnetic sensors. Firstly, mathematical equations of apparent permeability are explained and influencing factors are analysed. Then influencing degrees of different parameters of the flux concentrator are simulated by Maxwell 2D/3D. The results are shown as follows. (a) The larger diameter and thickness of the flux concentrator, the better is the effect of magnetic concentration. (b) The less the gap between core and concentrator, the better is the effect of magnetic concentration. (c) The larger relative permeability of the flux concentrator, the effect of magnetic concentration is unconspicuous for the material whose relative permeability is larger than ten thousands.

• Periodical: Advanced Materials Research (Volumes 712-715)
• Pages: 1876-1880
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.712-715.1876
• Online since: June 2013
• Authors: Sui Hua Zhou*, Zhi Yi Chen, Shi Min Feng
• Keywords: Apparent Permeability, Flux Concentrator, Induction Coil, Magnetic Sensor

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