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Three-dimensional analysis of dual track complementary type of heads for perpendicular magnetic recording

IEEE TRANSACTIONS ON MAGNETICS 1998年第4期34卷 1489-1491页

作者： Ichihara, T Nakagawa, S Matsumiya, H Naoe, M Tokyo Inst Technol Dept Phys Elect Tokyo 1528552 Japan

The reproduction flux distributions of the dual track complementary (dTC) type of heads for perpendicular magnetic recording were calculated using a 3-d finite element method and compared with those of the single pole type (SPT) of heads. The calculated reproduction flux hardly changed along the head pole, which indicates that the flux sensitive detector can be placed far from the air bearing slider surface in the dTC head system. As a result, the dTC type of recording heads may be a candidate for heads for perpendicular magnetic recording systems.

关键词： 3-d finite element method dual track complementary type of head perpendicular magnetic recording reproduction flux sensitivity

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Electrical Loss Analysis of AC Electromagnet With Shading Coil Taking Into Account Eddy Current in Laminated Cores

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IEEE TRANSACTIONS ON MAGNETICS 2014年第2期50卷 957-960页

作者： Yamaguchi, Tadashi Kawase, Yoshihiro Nakano, Tomohito Asano, Tatsuya Kawai, Ryosuke Takemoto, Takanori Gifu Univ Dept Elect Elect & Comp Engn Gifu 5011193 Japan Fuji Elect FA Components & Syst Co Ltd Saitama 3690192 Japan

Electrical loss of an ac electromagnet with shading coil is analyzed by considering the eddy current in the silicon steel sheets of the laminated cores. That is carried out by the 3-d finite element method on a parallel computing system. It is clarified that the consideration of eddy current in the silicon steel sheets is important for the electrical loss of ac electromagnets with shading coil.

关键词： 3-d finite element method AC electromagnet electrical loss laminated core parallel computing shading coil silicon steel sheet

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dynamic Analysis method of Spiral Resonant Actuator Using 3-d FEM

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IEEE TRANSACTIONS ON MAGNETICS 2010年第8期46卷 3157-3160页

作者： Suzuki, Satoshi Kawase, Yoshihiro Yamaguchi, Tadashi Kakami, Shuhei Hirata, Katsuhiro Ota, Tomohiro Gifu Univ Dept Informat Sci Gifu 5011193 Japan Osaka Univ Dept Adapt Machine Syst Suita Osaka 5650871 Japan Panason Elect Works Ltd Adv Technol Dev Lab Osaka 5718686 Japan

This paper proposes a dynamic analysis method for a novel spiral resonant actuator with two-degree-of-freedom employing the 3-d finite element method (FEM). The effects of the slit structure on the performance of the actuator are quantitatively clarified using this method. Furthermore, the effectiveness of calculated results is verified through the comparison with the measured ones.

关键词： 3-d finite element method dynamic characteristics analysis mesh modification method spiral resonant actuator

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Eddy current analysis considering lamination for stator core ends of turbine generators

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IEEE TRANSACTIONS ON MAGNETICS 2008年第6期44卷 1502-1505页

作者： Yamazaki, Katsumi Tada, Shin Mogi, Hisashi Mishima, Yoichi Kaido, Chikara Kanao, Shinichi Takahashi, Kazuhiko Idea, Kazumasa Hattori, Ken'ichi Nakahara, Akihito Chiba Inst Technol Chiba 2750016 Japan Nippon Steel Corp Ltd Chiba 2938511 Japan Hitachi Ltd Ibaraki 3191292 Japan

In this paper, we introduce a calculation method for in-plane eddy currents produced by perpendicular flux at stator core-ends of turbine generators. In the method, the laminated core is subdivided into each electrical steel sheet by 3-d finite elements. The insulated layers of the sheets are modeled by the gap elements, which represent the magnetic resistance of the layers. The combination method of double nodes and anisotropic conductivity is proposed to consider the insulation between the steel sheets. It is especially required for the stator teeth with slits. The validity of the calculation method is verified by comparing the measured and calculated results in the case of a simple model that simulates the end part of the turbine generator. The method is also applied to the real machine to clarify the eddy current distribution.

关键词： core-end in-plane eddy current lamination perpendicular flux 3-d finite element method turbine generator

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Electromagnetic nondestructive testing of rust region in steel

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IEEE TRANSACTIONS ON MAGNETICS 2005年第10期41卷 3616-3618页

作者： Gotoh, Y Hirano, H Nakano, M Fujiwara, K Takahashi, N Kurume Natl Coll Technol Dept Elect & Elect Engn Fukuoka 8308555 Japan Okayama Univ Grad Sch Nat Sci & Technol Dept Elect & Elect Engn Okayama 7008530 Japan

The inspection of rust region in steel is important in the petrochemical plant, etc. The B-H curve and the conductivity of rust region in steel are different from those of the normal steel. Then, the detection of rust region in steel is possible by detecting the difference of those electromagnetic properties using an inspection method. In this paper, those electromagnetic properties of the rust region in steel are measured utilizing three-dimensional (3-d) axis-symmetric finite-element method (FEM) and experiment. The electromagnetic inspection technique of the rust region is examined using 3-d edge-based hexahedral nonlinear FEM. The possibility of detecting the rust region using the proposed inspection system is illustrated. In addition, the experimental verification is also carried out.

关键词： 3-d finite element method Electromagnetic nondestructive inspection rust region in steel

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3-d nonlinear transient electromagnetic analysis of short circuit electromagnetic forces in a three-phase enclosure-type gas insulated bus

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IEEE TRANSACTIONS ON MAGNETICS 2000年第4期36卷 1754-1757页

作者： Takeuchi, T Yoshizawa, T Kuse, Y Hama, H Mitsubishi Elect Corp Adv Technol R&D Ctr Amagasaki Hyogo 6618661 Japan Mitsubishi Elect Corp Design Syst Engn Ctr Amagasaki Hyogo 6618661 Japan Mitsubishi Elect Corp Transmiss & Distribut Transportat Syst Ctr Amagasaki Hyogo 6618661 Japan

An accurate analysis of short circuit electromagnetic forces in a three-phase enclosure-type gas insulated bus (GIB) has been performed. The analysis clarified the effects of the eddy currents (skin effect) and the nonlinear permeability on the materials, The calculated magnetic fields agree with the measured fields. The electromagnetic force analysis considering the skin effect and the nonlinear permeability of the magnetic materials is important in view of reducing the GIB size.

关键词： electromagnetic forces eddy currents 3-d finite element method gas insulated bus

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3-d eddy current analysis in permanent magnet of interior permanent magnet motors

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IEEE TRANSACTIONS ON MAGNETICS 2000年第4期36卷 1863-1866页

作者： Kawase, Y Ota, T Fukunaga, H Gifu Univ Dept Informat Sci Gifu Japan

Interior permanent magnet motors are widely used in various held. However, in high-speed operations, it is important to decrease the eddy current loss in the permanent magnet. Therefore, we propose to divide the permanent magnet. This paper describes a practical technique to analyze the eddy current in the divided magnet. The effect of division of permanent magnet on eddy current loss is also quantitatively clarified.

关键词： interior permanent magnet motor eddy current 3-d finite element method

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Mathematical Model of Two-degree-of-Freedom direct drive Induction Motor Considering Coupling Effect

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JOURNAL OF ELECTRICAL ENGINEERING & TECHNOLOGY 2017年第3期12卷 1227-1234页

作者： Si, Jikai Xie, Lujia Han, Junbo Feng, Haichao Cao, Wenping Hu, Yihua Henan Polytech Univ Sch Elect Engn & Automat Jiaozuo Henan Peoples R China Aston Univ Sch Elect Elect Engn & Comp Sci Birmingham W Midlands England Univ Liverpool Dept Elect Engn & Elect Liverpool Merseyside England

The two-degree-of-freedom direct drive induction motor, which is capable of linear, rotary and helical motion, has a wide application in special industry such as industrial robot arms. It is inevitable that the linear motion and rotary motion generate coupling effect on each other on account of the high integration. The analysis of this effect has great significance in the research of two-degreeof- freedom motors, which is also crucial to realize precision control of them. The coupling factor considering the coupling effect is proposed and addressed by 3d finite element method. Then the corrected mathematical model is presented by importing the coupling factor. The results from it are verified by 3d finite element model and prototype test, which validates the corrected mathematical model.

关键词： Coupling effect Mathematical model 3-d finite element method Two-degree-offreedom direct-drive induction motor

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Numerical calculation of primary slot leakage inductance of a Single-sided HTS linear induction motor used for linear metro

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CRYOGENICS 2017年 82卷 38-47页

作者： Li, dong Wen, Yinghong Li, Weili Fang, Jin Cao, Junci Zhang, Xiaochen Lv, Gang Beijing Jiaotong Univ Sch Elect & Informat Engn Beijing 100044 Peoples R China Beijing Jiaotong Univ Sch Elect Engn Beijing 100044 Peoples R China

In the paper, the numerical method calculating asymmetric primary slot leakage inductances of Single sided High-Temperature Superconducting (HTS) Linear Induction Motor (HTS LIM) is presented. The mathematical and geometric models of three-dimensional nonlinear transient electromagnetic field are established and the boundary conditions are also given. The established model is solved by time stepping finite element method (FEM). Then, the three-phase asymmetric primary slot leakage inductances under different operation conditions are calculated by using the obtained electromagnetic field distribution. The influences of the special effects such as longitudinal end effects, transversal edge effects, etc. on the primary slot leakage inductance are investigated. The presented numerical method is validated by experiments carried out on a 3.5 kW prototype with copper wires which has the same structures with the HTS LIM.(C) 2017 Elsevier Ltd. All rights reserved.

关键词： HTS linear induction motor Longitudinal end effect Transversal edge effect Asymmetric primary slot leakage inductance Magnetic saturation 3-d finite element method

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Optimization of volume fractions for functionally graded panels considering stress and critical temperature

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COMPOSITE STRUCTURES 2009年第4期89卷 509-516页

作者： Na, Kyung-Su Kim, Ji-Hwan Seoul Natl Univ Coll Engn Sch Mech & Aerosp Engn Inst Adv Aerosp Technol Seoul 151742 South Korea

Volume fraction optimization of Functionally Graded Materials (FGMs) is investigated considering stress and critical temperature. Material properties are assumed to be temperature dependent, and are assumed to be varied continuously in the thickness direction according to a simple power law distribution in terms of the volume fractions of the constituent materials. The effective material properties are obtained by applying linear rule of mixtures. The 3-d finite element model is adopted using an 18-node solid element to analyze more accurately the variation of material properties and temperature field in the thickness direction. For the various FGMs volume fraction distributions, mechanical stress analysis and thermomechanical buckling analysis are performed to get the critical conditions. Finally, the optimal designs of FGMs panels are investigated for stress reduction and improving thermo-mechanical buckling behavior. (C) 2008 Elsevier Ltd. All rights reserved.

关键词： Functionally graded materials 3-d finite element method Stress analysis Thermo-mechanical buckling Optimal design

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