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A general method to model rotary machines using finite-element method (FEM) of transient magnetic field computation is presented. The merits of the proposed methods are that the nonlinear iteration on the rotor position is avoided; a curvilinear element is used in the two sides of the sliding surface; the methods being proposed to deal with matching boundaries and periodic boundaries are very general,...
This paper describes a meshless approach to obtain accurate solutions for propagating microwave problems. The Meshless Local Petrov-Galerkin (MLPG) method, with the Heaviside step test functions and Radial basis point interpolation method (RPIM) shape functions, is used. Results are obtained for a two-dimensional model and are compared with a consolidated Finite Element Method (FEM).
Electrical discharges; especially electrical discharges in air are still one of the most unexplored fields of the physics. Lately, there are numerical models of electrical discharges appearing, special group of which are simulations. It appeared that the finite element method (FEM) is not a good choice for simulations to base on. Instead of FEM charge simulation method (CSM) has been used in work...
An efficient mesh reconstruction method is proposed for remeshing the parameterized computation domain when using finite element method to optimize the shapes of electromagnetic devices. The proposed method has the merits of conserving the original structure of the mesh with minimal mesh deformation. The proposed method has been applied to TEAM workshop problem No. 25 and a permanent magnetic (PM)...
Direct and inverse analytical models of the switched reluctance motor (SRM) based on finite element method (FEM) results are presented in the paper. The models are obtained using three flux-current characteristics, which can be calculated from 2D-FEM or obtained on a test bench. The models can also be simplified for use in real time control. The model accuracy and versatility in characterizing the...
In this paper, a technique for combination of fast moving least square reproducing kernel method (FMLSRKM) which is a kind of meshfree methods and finite element method (FEM). Point collocation scheme is used for FMSLRKM. Combined method is tested using 2D electrostatic problem.
The goal of this paper is to compute k-β diagrams of photonic crystals, accurately and fast. For this purpose, we propose a multi-point model-order reduction scheme for the modal analysis of periodic structures, based on the finite element method. Our numerical example demonstrates that the new approach is significantly faster than conventional FE solutions, while error levels are very similar.
Rotary machines have limitations at linear moving systems. So linear motors make good used of linear actuator. The purpose of this paper is concerned with the characteristic analysis to thickness of secondary conductor in TLIM using axisymmetric model. Characteristic equations of TLIM are obtained from voltage equation. Using finite element method (FEM), parameters of voltage equation are calculated...
A new and simple formulation of equivalent conductivity in the direction normal to the laminations is derived by analyzing and comparing the electromagnetic fields and the eddy current losses in a laminated iron core and a single lamination. Then the anisotropic conductivity tensor is updated. The conductivity formulation can make it easier to calculate numerically three-dimensional eddy current fields...
Dual mechanical port machine (DMP) - a kind of continuous electrical variable transmission, is a very competitive alternative for vulnerable constant speed-ratio mechanical gearbox in high capacity wind power generation system. As the inner rotor is surrounded by the stator and the outer rotor, the DMP machine suffers from PM demagnetization and insulation failure under severe thermal condition. To...
A permanent magnet tubular linear generator (PMTLG) is presented for wave energy conversion due to its direct drive characteristics. Finite Element method is implemented to calculate and optimize the waveform of magnetic field along air-gap of PMTLG with Halbach array. The computational results are validated by experimental ones.
This paper is proposed the negative 3rd harmonic elimination by air-gap flux density shape dispersion of interior type permanent magnet (IPM) motor for vibration minimization. For minimization of vibration, the optimal notches are put on the rotor pole face is applied. The variations of vibration computation by finite element method (FEM) and the validity of the analysis and rotor shape design are...
This paper introduces a multi-level robust surrogate-based optimization (MRSBO) applied to design of electrical machines. Manufacturing tolerances, material properties, operational and environmental conditions may generate uncertainties that can significantly affect machine performance. The framework developed includes the finite element method (FEM), statistical uncertainty quantification (SUQ) and...
The response of lightning impulse voltage was explored in dielectric liquids employing the hydrodynamic modeling with three charge carriers by using the finite element method. To understand the physical behaviors of discharge phenomena in dielectric liquids, the response of step voltage has been extensively studied recently by using numerical techniques, but that of lightning impulse voltage was rarely...
This paper deals with a coupling scheme for open boundary problem. It couples an analytical solution of Fourier series expansion with the standard finite element method. The analytical solution is derived for the magnetic field in the outside of the boundary, and the finite element method is for the magnetic field in the inside with source current and magnetic materials. The main advantage of the...
A state space finite element method is presented for the calculation of transient electric field in oil-immersed insulation system of converter transformer. Firstly, the state equation is derived based on the quasi-static electric field theory, combined with the given boundary value using the penalty method, which has a clear physical meaning. Secondly, the state equation is solved in a fine integration...
A novel equivalent circuit of induction motors is investigated by the finite element method in order to take into account the effects of stray load loss and harmonic torques. The characteristics of the motor obtained by the proposed and conventional circuits are compared to the measured results in order to confirm the validity and usefulness of the proposed circuit. It is revealed that the result...
The multi-degree of freedom surfaced permanent-magnet motor (Multi-D.O.F. SPM) researched in this paper has characteristic of rotor tilt. Generally electromagnetic field of an electric rotating machine is analyzed by using the 2-D finite element method, because the electromagnetic features show same phenomena in the rotational axis direction. However the Multi- D.O.F. SPM should be analyzed by using...
A thermal model of the human eye is constructed using the new developed computational model. Weighted extended basis splines in the finite element method is employed to calculate the steady-state temperature distribution in a normal human eye. In this paper, the results are verified with experimental results obtained by previous studies on human as well as animal eyes with finite element computational...
The development of code for finite elements-based field computation has been going on at a pace since the 1970s, yielding code that was not put through the formal software lifecycle. As a result, today we have legacy code running into millions of lines, implemented without planning and not using proper state-of-the-art software design tools. It is necessary to redo this code to exploit object oriented...
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