tailieunhanh - Modeling of magnetic fields and eddy current losses in electromagnetic screens by a subproblem method

The aim of this paper is based on a subproblem technique with the magnetic vector potential formulation to compute magnetic fields, eddy currents and Joule power losses in electromagnetic screens that are extreamly difficult to perform by a finite element method. | ISSN: 1859-2171 TNU Journal of Science and Technology 194(01): 7 - 12 MODELING OF MAGNETIC FIELDS AND EDDY CURRENT LOSSES IN ELECTROMAGNETIC SCREENS BY A SUBPROBLEM METHOD Dang Quoc Vuong* School of Electrical Engineering, Hanoi University of Science and Technology ABSTRACT The aim of this paper is based on a subproblem technique with the magnetic vector potential formulation to compute magnetic fields, eddy currents and Joule power losses in electromagnetic screens that are extreamly difficult to perform by a finite element method. The subproblem method is herein developed for coupling problems in two steps: A problem starting from simplified models with stranded inductors and thin screen models can be also first considered. Then a correction problem with the actual volume thin regions is added to correct inaccuracies from previous problem. All the steps are separately performed with different meshes and geometries, which facilitates meshing and speeding up the calculation of each problem. Keywords: Magnetic field, Eddy current, Joule power loss, Electromagnetic screen, Magnetodynamics, Subproblem method (SPM), Magnetic vector potential. Received: 18/10/2018; Revised: 16/11/2018; Approved: 28/12/2018 MÔ HÌNH HOÁ CỦA TỪ TRƯỜNG VÀ DÒNG ĐIỆN XOÁY TRONG MÀN CHẮN ĐIỆN TỪ BẰNG PHƯƠNG PHÁP LIÊN KẾT BÀI TOÁN NHỎ Đặng Quốc Vương* Viện Điện - Trường Đại học Bách khoa Hà Nội TÓM TẮT Mục đích của bài bài báo được dựa trên phương pháp bài toán nhỏ với công thức véc tơ từ thế để tính toán từ trường, dòng điện xoáy và tổn hao công suất trong các màn chắn điện từ, mà khó có thể thực hiện trực tiếp bằng phương pháp phần tử hữu hạn. Ở đây, phương pháp bài toán nhỏ được phát triển để liên kết các bài toán theo hai bước: Một bài toán với mô hình đơn giản (các cuộn dây và màn chắn điện từ) được giải trước, sau đó một bài toán hiệu chỉnh được thêm vào để hiệu chỉnh sai số do bài toán trước gây ra. Tất cả các bước đều được thực hiện độc lập với các lưới và miền hình học khác nhau,

• Điện - Điện tử
• Magnetic field
• Eddy current
• Joule power loss
• Electromagnetic screen
• Subproblem method
• Magnetic vector potential
• Electronic Engineering
• Turbine generator
• Magnetic transmission
• Magnetic torque
• Lecture General Physics II
• Bài giảng Vật lý đại cương 2
• Magnetic materials
• Magnetic fields
• Magnetic field lines
• Earth’s magnetic field
• Optical bistability in a degenerate two level eit medium
• The influence of an external magnetic field
• Electromagnetically induced transparency
• External magnetic field
• Optical bistability
• Engineering electromagnetics
• Lecture Engineering electromagnetics
• Steady magnetic field
• Ampere’s circuital law
• Stokes’ theorem
• Magnetic flux density
• Communications in Physics
• The temperature sensitivity
• Critical electric field induced magnetic easy axis reorientation ferromagnetic
• Ferroelectric layered heterostructures
• Grown on ferroelectric
• The magnetic easy axis reorientation
• High intensity focused ultrasound
• Low intensity focused ultrasound
• Pulsed magnetic field
• Static magnetic field
• Non invasive cancer treatment
• Artificial neural networks
• Magnetic material modeling
• Coupled properties
• Field computation
• Magnetic media modeling
• Utilizing neural networks
• Transport properties of a quasi two dimensional electron gas
• InP In1−xGaxAs InP quantum wells
• Correlation and magnetic field effects
• The local field correction
• Large deviations principle
• Heisenberg model
• External magnetic field
• Gibbs measure
• Non critical temperature
• Lecture Physics A2
• Bài giảng Vật lý A2
• Magnetic force
• Semicircular conductor
• Vector form of torque
• Kỹ Thuật
• Công Nghệ
• Điện
• Điện tử
• CIRED 2003
• Magnetic Field Mitigation Techniques
• Journal of Chemistry
• Influence of magnetic field on properties
• Electrodeposited FeCo layer
• Scanning Electron Microscopy
• Energy Dispersion Spectroscopy
• X Ray Diffractometer
• Hall effect in the doped semiconductor superlattice
• In plane magnetic field under influence
• Intense electromagnetic wave
• Electron phonon interaction
• Lowest excited state impurity binding energy
• Ingan gan parabolic QWW
• Magnetic field effect
• Quantum well wire
• Magnetic field stimulation
• Mitotic activity
• Antioxidant enzyme
• Ameliorate soil water stress
• Lupin Lupinus angustifolius L
• Exotic states emerged by spin orbit coupling
• Exotic states emerged by lattice modulation
• Exotic states emerged by magnetic field
• Lieb nano ribbons
• The spin orbit coupling
• Exchange correlation effects
• Metal–insulator transition
• Many body effects
• GaAs/InGaAs/GaAs quantum well
• AC magnetic field
• Preferential flow paths
• Earthen dam
• Preferential flow paths in earthen dam
• Approximative method for analyzing
• Electric field
• Neem leaf extract
• Yield and tomato
• Yield attributing traits of tomato
• Nonlinear vibration
• Carbon nanotube
• Nonlocal strain gradient
• Galerkin method
• Equivalent linearization
• Weighted averaging
• Journal of Biology
• Renal ischemia reperfusion injury
• Extremely low frequency magnetic field
• Fourier transform infrared spectroscopy
• Organ transplantation
• Hypothetical model built
• ANSYS software
• Proposed calculation method
• Dirac Weyl equations
• Exponentially decaying magnetic field
• Gapped graphene
• Extraordinary electronic
• Dirac nature feature
• Vertical plate
• Mass transfer
• Variable viscosity
• Gas turbines
• Gas cooled nuclear reactors
• Electromagnetic field
• Finite element modoleing
• Magnetic signature
• Naval vessel
• Ships magnetic field