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We are interested in the deformation of a thin magnetoelastic film. This has many possible applications, such as in microfluidic actuators and sensors. In previous articles a finite element method has been used for transient simulation of the deformation of the film, for the special case of soft magnetic material only. In this article the approach is extended to the case of hard (permanent) magnetoelastic...
A new induction wok station based on the induction heating principle has been design, prototyped and tested. The impedance is important for the resonant circuit design and its impedance is computed accurately to different induction wok station. A one-dimensional field calculation method has been developed that make the computation simple and is able to predict the impedance of the work station.
This work presents an optimization on the input impedance of Koch triangular quasi-fractal antennas using an efficient genetic algorithm (GA). The impedance matching is done by using an inset-fed, which is optimized to minimize the return loss (RL). The excitation of this structure is done using a microstrip line. The antennas are designed using the Ansoft Design™ software and the new structures,...
The single-phase BLDCM(Brushless DC Motor) has many defects. This paper compares optimized single-phase BLDCM with existing commercial single-phase BLDCM and develops single-phase BLDCM with high efficiency, satisfying demanded power and torque in pump system. This paper presents the statistical optimum design of single-phase BLDCM for pump system by ANOVA(Analysis of Variance) to select effective...
Considering the influence of wires sag, towers, up-and-downs on the ground, surrounding buildings and other situations, the ionized field under HVDC transmission lines is actually a 3-D field and its calculation method is necessary to be found. In this paper, a method to calculate the 3-D ionized field was proposed to be based on the Deutsch assumption. After the validity of the method is testified,...
In this paper, we propose an analytical method of polar anisotropic ferrite bonded magnet to outer rotor type brushless dc motor considering magnetizing process. The characteristics of polar anisotropic magnets are different from cored type ones which have uniform magnetization direction. Consequently, the magnetization directions of ferrite bonded magnet are analyzed by finite element analysis for...
Magnetic hysteresis curves were simulated by Monte Carlo method to study magnetic property changes under the sensitization of Ni base alloy, Alloy 600 (Inconel) which is well used as structural materials in nuclear power plants. Different distributions of spin concentration depending on heating duration time in cubic clusters caused to change hysteresis curve. The calculation results agree to the...
Partial least square regression is applied for the processing of eddy current testing data used for the reconstruction of the shape parameters of cracks. The procedure is applied for cracks having very small spatial extensions. It is found that the reconstruction of the area of such cracks is considerably more robust than the reconstruction of their length and depth parameters.
In this paper, torque characteristics analysis of synchronous reluctance motor by winding function theory is described. The stator is same as one of the induction motor but rotor have two differential geometries of the flux barrier to reduce the torque ripple. The flux barriers were designed by optimization algorism considering torque ripple. Inductances for the separate part of the rotor were calculated...
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,...
In the design optimization of electric machine, there is a strong need to comprehend in detail the tradeoff relationships among the various objective functions. Therefore, it is important to obtain the sufficiently diverse pareto solutions for appropriately designing electric machine. However, the conventional genetic algorithm (GA) doesn't necessarily find out the diverse pareto solutions. In this...
This paper presents modeling of coreloss resistance for d-q equivalent circuit analysis of IPMSM considering harmonic linkage flux. High efficiency is one of major advantage of IPMSM, therefore precise loss analysis is required for high efficiency design. However, there is practical limitation of d-q equivalent circuit analysis due to harmonic linkage flux especially at high speed region where field...
A procedure is proposed to efficiently model thin wires in lossy medium by finite element analysis. It is based on the determination of a suitable grid size in the vicinity of the wire, which strongly depends on the wire radius to yield accurate results. The approach is well adapted to the analysis of grounding systems.
Low-speed flux-modulated (FM) motor, which violates the conventional design rule and has different number of pole pairs in the stator and rotor, is examined. In the original FM motor, the magnetic flux is modulated using special iron segments in the air gaps. It has the merit of having high power density at low speed. In this paper an improved structure of the FM motor which has only one air gap between...
This paper presents the optimal design method of cage-bars in a single-phase line-start permanent magnet synchronous motor. This method consists of two procedures. First, the basic design of cage-bars is made by analytic method of an induction motor. But, this method cannot consider nonlinear characteristic as magnetic saturation and leakage flux. Therefore, at second step, for considering the nonlinear...
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).
This paper presents an analysis of back EMF, inductance, current, and thrust to analyze the effects of unbalanced phase caused by end part in PMLSM. Experiment and FEA are used as analysis methods. To solve the problem of unbalanced phase in PMLSM, the optimal design of auxiliary-teeth model is carried out by using DOE (Design of Experiment).
By analogy with Halbach permanent magnet (PM) array, a novel ironless trapezoid winding array (TWA) is designed to achieve a primarily single-sided and well sinusoidal magnetic field. After deriving the TWA's current density formula in Fourier series, via the magnetic vector potential we derive the analytical solution of its magnetic field, which is verified by ANSYS finite-element method.
Permanent magnet (PM) motors are being applied to larger system. In high speed and large scale PM motors, the eddy current in PM due to space harmonics field raises its temperature and then results in reduction of maximum torque and energy efficiency. Among new design techniques there are magnet shape optimization, segmentation and relocation of bulk magnet. This paper presents an analysis method...
Summary form of only given: To reduce the detent force by end effect, the auxiliary core which has the independent magnetic circuit is proposed in this paper. The auxiliary core is designed by the DOE (Design of Experiment) and FEA. And the prototype machine of auxiliary core is made and experimented. To demonstrate reduction effect of the detent force by the auxiliary core, the experimental results...
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