The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
In switched reluctance motors, rotor position information can be extracted from the measurement of position-dependent phase voltage resonances. Due to hysteresis in the magnetic core of the machine, subsequently triggered resonances can exhibit different resonance waveforms, even when the rotor is held at a constant angular position. In order to analyze the influence of hysteresis, a finite-difference...
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...
A novel stator geometry for linear switched reluctance motor (LSRM) that improves the force profile is presented. In the new geometry, pole shoes are affixed to the stator poles. Static and dynamic characteristics for the proposed structure have been highlighted. Frequency spectrum analyses of force profile using the fast Fourier transform (FFT) are described to predict the vibration frequencies....
This paper presents analytical design procedures of transverse flux linear motor (TFLM). With ratios of important design variables and simplified equivalent magnetic circuit, flux linkage is determined at load and no-load condition. The number of turns of windings can be calculated by considering the amplitude of applied voltage, and rated current, coil diameter, and winding area can be obtained with...
We propose a BIE to solve multiply connected problems with one unknown of the double layer charge. Since the double layer charge produces only the potential gap without disturbing the normal magnetic flux density, it offers the generic formulation for both the single and multiply connected problems including robust treatment of geometrical singularities and arbitrary magnetic permeability.
We solve nonlinear eddy current problems by regarding the nonlinear property as fictitious sources. So as to obtain the boundary values, we derive a novel boundary integral equation with one unknown utilizing the impedance boundary condition. We perform the nonlinear analysis while improving alternately the boundary values and the fictitious sources.
Summary form of only given: We present here an original method of computing the magnetic induction in a conductor thanks to a post-processing from the Boundary Elements Method (BEM). This general formulation is then applied to the case of underwater electric systems under cathodic protection.
The paper presents an artificial intelligence approach in electromagnetic interference study between high voltage power lines and metallic underground pipelines for different problem geometries. The presented artificial intelligence solution is a layer recurrent neural network one. Results gained with neural networks are compared to finite element solutions considered as standard ones.
Permanent Magnet (PM) machines constitute a favored drive choice in electric traction applications due to their increased efficiency. Design optimization of such machines could enhance their ability to satisfy contradictory static and dynamic requirements. In this paper a Differential Evolution (DE) algorithm for PM machine design optimization, coupled with a finite element analysis (FEA) is employed.
This paper presents a new technique to reconstruct faulty wiring networks from the time domain reflectometry response. The method is also for characterization of defects in branches on the network. The direct model for wave propagation along the transmission lines is modelled by RLCG circuit parameters and the Finite Difference Time Domain (FDTD) method. Neural Networks (NNs) are used to solve the...
In this paper, new MRAM designs for high Gb/Chip with pole system was introduced. In order to overcome problem of reducing power consumption, we proposed new MRAM design that has two additional high permeable poles. Proposed new MRAM designs has a strong switching field owing to two poles added on both sides of the free layer, just like perpendicular magnetic recording heads.
This paper presents an optimization method of the back EMF for the double layered(double air gap) large scale BLDC motor by using a Latin-hypercube sampling strategy. A new configuration of the double layered BLDC motor is also proposed for the compactness and high efficiency of the system.
Simultaneous switching noise (SSN, also called delta-I noise) has became a tremendous challenge to the reliable operation of high speed circuit. A new method for modeling SSN of gapped power-ground planes is proposed in this paper. The gapped power-ground planes characteristics are derived from a hybrid field-circuit method. With this method, the parallel power-ground planes resonance characteristics...
This paper investigates the performances of different evolution strategies applied to slot shape optimization for a permanent magnet synchronous machine. (1,2), (1, 3) and (1,4) evolution strategies are implemented with different values of learning rate to compare their convergence and reliability.
Summary form of only given: A parallel high precision integration (HPI) scheme combined with the spectral element method (SEM) is presented to solve the time-dependent Maxwell's equations. The vector spectral elements are employed for spatial discretization, and a parallel HPI scheme based on matrix exponential and time domain segmentation is proposed for solving the semi-discretized system by SEM...
Novel moving least-square (MLS) approximation based shape functions are constructed for triangular element with variable nodes. The new shape functions are applied to deal with the sliding-surface for modeling the rotation of electric machines. Numerical result shows that the new method is accurate and valid in dealing with non-conform meshes.
This paper discusses the electromagnetic and fluid flow modeling of an EMS system that is capable of generating large magnitude stirring forces that are sinusoidally modulated at an arbitrarily low frequency. The system hardware is based on conventional, readily available EMS power supplies and stator/coil designs. The paper addresses the modeling of a multi-frequency em system, the coupling of the...
The magnetic fields due to different planar Halbach permanent magnet (PM) array, including the 4 piece square array, stretched 8 piece square array and trapezoid array, are studied by analytic calculation method and FEM. On this basis, the magnetic forces over the magnet weight per array unit area are obtained. Then comparisons of above results indicate that the trapezoid array can provide the maximum...
The performance of a variable speed, direct-drive synchronous generator wind turbine concept is compared for two grades of electric steel applied for the generator stator core lamination. A ring type, radial flux permanent magnet synchronous generator (PMSG) is modelled. For a fixed mechanical power input, the geometry of the PMSG is optimized for each material to maximize the annual energy yield...
A fast three-dimensional (3D) ground penetrating radar (GPR) forward and inverse scattering method is presented based on the diagonal tensor approximation (DTA). For the forward scattering problem, the first iteration about the frequency-dependent scattering coefficients in the DTA is used. By further evaluating the scattering tensor at the GPR center frequency to remove its frequency dependence,...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.