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The modified element-free Galerkin (EFG) method has been proposed for calculating the shielding current density in a High-Temperature Superconductor (HTS). In the present study, the circle sub domain where each node is centered is installed in the analytic domain and the problem is discretized using sub domain instead of integration cells. Furthermore, highly accurate evaluation of improper integrals...
This paper presents the use of Exodus method to compute potential distribution in a conducting prolate spheroidal shell. The transition probabilities for the Exodus method simulation are obtained from the finite difference scheme transformation of the prolate spheroid Laplace equation. This method is independent of the random number generation from the computing facility and gives more accurate results...
This paper presents the optimal design method for shape of claw-pole in a PM stepping motor. The shape design of claw-pole must consider a magnetic saturation and leakage flux. The best solution is 3-Dimensional FEM, but it needs too much computation time and computer resources. So, in this paper, numerical techniques applied to classical magnetic equivalent circuit method to consider the magnetic...
This paper presents an analyzing method of the capacitance of the power transformer for insulation design. The 2 MVA 22.9 kV transformer is applied to the proposed algorithm for calculating of the initial voltage distribution.
This paper is about novel designed magnetophoretic display system that is using bistable magnetic ball. Nowadays, it must is most of important issue that is efficient using energy and saving energy in the common problem. When display system is refreshing the display, it need a energy source but it will have not been needed any energy for continued displayed display.
A modified tabu search method for global optimizations of inverse problems is presented. In the proposed algorithm, the whole search procedure is divided into three different phases. Two new point generating mechanisms as well as a dynamic parameters updating rule are proposed to improve the searching efficiency without compromising the solution's accuracy. Numerical results on TEAM Workshop Problem...
In order to improve rotor-impeller suspension performance of the developing ventricular assist device, axial magnetic bearing with various permanent magnet arrangements are designed and fabricated. Separate permanent magnets type stator shows wide linear range and improved force characteristics.
The explicit finite-difference solution method for computing potential distribution within spheroidal systems attracts special difficulties because of the presence of mathematical singularities at the central and pole regions of the spheroids. In this paper, we implement a method for treating the singularities. This entails taking a quarter of the spheroidal cross-section and imposing a Neumann boundary...
This paper presents the behavior of a grounding mesh in presence of a high-frequency overvoltage transient caused by switch closing in electrical substations and atmospheric discharges. The simulation of the mesh is based on Transmission Line Method (TLM). The output of the simulation is the sum of induced and conducted currents caused by such high-frequency overvoltage input in some spot of the mesh...
The finite element (FE) analysis of electromagnetic fields suffers from slow convergence of linear solvers when there are flat or distorted elements. Similar problems also happen when with layered structures such as laminated steel plates. These problems are attributed to poor matrix conditioning. This paper shows the deflation technique, which replaces small eigenvalues of the FE matrix with zeros,...
In this paper, a new type of memory motors, namely the stator-permanent-magnet (S-PM) doubly salient flux memory (DSFM) motor is proposed. The concept of flux memory is due to the nature that the magnetization level of the AlNiCo permanent magnet (AlNiCo-PM) in the motor can be regulated by a temporary DC current pulse and be memorized automatically. To accurately analyze the DSFM motor, a piecewise-linear...
The induction planar actuator (IPA) in study is an electromagnetic structure formed by a static ferromagnetic core with an aluminium plate that corresponds to the secondary, and a mover, also called primary; the latter comprehends two sets of three-phase windings that are orthogonal to each other. When they are fed by a three-phase ac excitation, a moving magnetic field is established; it can travel...
This paper introduces an original approach for modeling the external induction variation of a complex ferromagnetic structure undergoing magneto-mechanical effects. From the Jiles Law of Approach that describes the intrinsic magnetization changes due to magnetostriction, an expression of the law in terms of conveniently external measurable induction B is derived for thin ferromagnetic devices. Based...
An inversion methodology for microwave imaging based on an improved tabu search algorithm and frequency-domain finite element method is proposed. Numerical results are reported to reaffirm positively its feasibilities and advantages.
The Variable Preconditioned GVR (VPGCR) with mixed precision on Graphics Processing Unit (GPU) using Compute Unified Device Architecture (CUDA) is numerically investigated. The convergence theorem of VPGCR is guaranteed that the residual equation for the preconditioned procedure can be solved in the range of single precision operation. The results of computations show that VPGCR with mixed precision...
An efficient methodology based on Cross Entropy (CE) methods for finding both robust and global optimal solutions of an inverse problem under uncertain conditions is proposed and its merits are validated by numerical experiments.
In this paper, an automated design tool with coupled analytical and numerical methods and the application of this tool for the design of a complete machine series is demonstrated. The paper points out the advantages of combining these methods for the development of electrical machines. Prototype measurements are analyzed and critically compared to the simulation results to expose possible limitations.
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...
An effective methodology for a robust global optimization of electromagnetic devices is presented. In the method, gradient index is minimized while the original objective function to be minimized is transformed to a constraint. Since the objective function values and gradient indices are approximated using surrogate functions, the method is numerically efficient.
In this paper, both analytical method and numerical method are used to suggest the rotor design process of the single-phase LSPM motor. The cage-bar is designed to generate the maximum starting torque by analytical method. The torque generated from the synchronous speed is divided into reluctance torque and magnetic torque to design barriers and permanent-magnets. In this process, optimal design method...
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