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Sensors 2013, 13(2), 1664-1678; doi:10.3390/s130201664
Article

Magnetic Field Analysis of Lorentz Motors Using a Novel Segmented Magnetic Equivalent Circuit Method

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State Key Laboratory of Digital Manufacturing Equipment and Technology, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan 430074, Hubei, China
* Author to whom correspondence should be addressed.
Received: 14 December 2012 / Revised: 17 January 2013 / Accepted: 21 January 2013 / Published: 28 January 2013
(This article belongs to the Section Physical Sensors)

Abstract

A simple and accurate method based on the magnetic equivalent circuit (MEC) model is proposed in this paper to predict magnetic flux density (MFD) distribution of the air-gap in a Lorentz motor (LM). In conventional MEC methods, the permanent magnet (PM) is treated as one common source and all branches of MEC are coupled together to become a MEC network. In our proposed method, every PM flux source is divided into three sub-sections (the outer, the middle and the inner). Thus, the MEC of LM is divided correspondingly into three independent sub-loops. As the size of the middle sub-MEC is small enough, it can be treated as an ideal MEC and solved accurately. Combining with decoupled analysis of outer and inner MECs, MFD distribution in the air-gap can be approximated by a quadratic curve, and the complex calculation of reluctances in MECs can be avoided. The segmented magnetic equivalent circuit (SMEC) method is used to analyze a LM, and its effectiveness is demonstrated by comparison with FEA, conventional MEC and experimental results.
Keywords: magnetic equivalent circuit; finite element analysis; Lorentz motor; magnetic flux density; quadratic curve magnetic equivalent circuit; finite element analysis; Lorentz motor; magnetic flux density; quadratic curve
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.

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Qian, J.; Chen, X.; Chen, H.; Zeng, L.; Li, X. Magnetic Field Analysis of Lorentz Motors Using a Novel Segmented Magnetic Equivalent Circuit Method. Sensors 2013, 13, 1664-1678.

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