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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 (CC BY 3.0).
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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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