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The paper presents a novel rotor design with U-shape flux barriers concept for a hybrid excited synchronous machine with flux magnetic bridges. Based on 3D finite element analysis the influence of axial flux bridges on the field-weakening characteristics of the machine is estimated and compared with experimental results. Moreover, harmonics spectrum of the air-gap flux density, no-load magnetic flux...
The paper includes simulation results of the Hybrid Excited Claw Pole Generator with skewed and non-skewed permanent magnets. The test machine has claw poles on two rotor sections, between which an excitation control coil is placed. The novelty of this machine is existence of non-skewed permanent magnets on claws of one part of the rotor and skewed permanent magnets on the second one. The paper presents...
Electrical equipment with nonlinear current-voltage characteristics are the source of numerous unfavorable phenomena in power supply networks. One such phenomenon is the harmonic current disturbance, the level of which is characterized by a total harmonic distortion THDI. The value of the THDI depends on many factors, primarily the construction, the principle of operation of the equipment and the...
The paper presents the possibilities, advantages and author's experience in application of electromagnetic field modeling in the teaching process in the study of electrical engineering specialties. The aim is to demonstrate how on the basis of computer simulations, the students can examine the field distribution for different geometry and operating conditions of given device. In addition, students...
In order to calculate the copper loss calculation with coil end effect in a practical computation time, the zooming method, which is one of the model reduction methods, is applied to the analysis of an three-phase synchronous motor. Moreover, the faster calculation technique is proposed for the analysis of three-phase synchronous motor. The copper loss of litz wire with a coil end can be calculated...
In this study, the response of a recently proposed fractal structure namely Apollonius Circles to an incident plane wave is addressed in terms of resonance frequencies, bandwidth and stability at oblique incidence. Although the base structure has been applied as a defected ground plane, the stand alone reflection characteristics is still needed to be examined. 0–30 GHz range is examined in both TE...
Computer programs used for three-dimensional visualizations of phenomena occurring within the electromagnetic field do not have built-in diagnostic tools allowing to verify the quality of the obtained view. The image presented during the simulation may contain a variety of artifacts. The anomaly most often identified in three-dimensional images is vertical disparity. Detection of the above mentioned...
The potential of BCI technology is used in scientific study of human perception and vision in medical and non-medical domains. In this paper we try to capture and interpret visual perception and attention in video movies by eye tracking and EEG technology simultaneously. Joint analysis of EEG and eye tracking offer new potentials for video analysis. The results of this research shown coherence between...
This paper presents the construction the time-voltage signal output model of the combination wave generator using neural networks. The discussed model of surge was developed using feedforward neural networks with one hidden layer with four neurons. The results of the comparative tests show the high efficiency of Leveneberg-Marquardt algorithm using in the developed model, despite the lack of optimization...
In this study, 1.25 MVA, 3-phase power transformer was analyzed using 2-dimensional and 3-dimensional finite element method (FEM) and analytical method. Leakage reactance, magnetic flux density, iron losses, energy, radial and axial force of the transformer were calculated using ANSYS Maxwell® software and analytical method. The prototype transformer was constructed based on the finite element method...
The article presents and discusses the results of theoretical analysis and experimental investigations of the developed miniature switch with a ball contact controlled by displacement in space of the singular points of the energizing magnetic field. It can be effectively used both as a common switch and as a detector of magnetic field distribution under designing and/or assembling process of any magnetic...
In this paper, a new approach to a nonlinear dq model is proposed for transient simulations of a salient-pole wound-rotor synchronous machine with dampers. Despite the nonlinearity between the flux linkage and the current, the comparison with finite element simulations shows that the new model is reliable for saturated transient state of the machine. This method allows to obtain far more accurate...
This paper presents an investigation of influence of different winding configurations and stator teeth width on permanent-magnet (PM) machines with similar slot and pole numbers. The results show that the machine with alternative teeth wound has higher output torque and stronger fault tolerant capability by finite element analysis. Unequal stator teeth width and teeth top width are applied to improve...
Rotational single sheet testers allow a characterization of soft magnetic materials under rotating magnetization as occurring in electrical machines. Due to the nonlinear behavior of the materials, suitable control algorithms have to be developed. In this work, a simulation model based on finite element simulations is derived, which is able to emulate the nonlinear behavior of the magnetic circuit...
Electromagnetic launcher, also called railgun, is a projectile accelerator which uses the electromagnetic force. Existence of solid metal containment around the rails of electromagnetic launchers, which increases the mechanical durability, affects the electromagnetic force on armature and rails. In this study, the effect of distance between non-laminated conducting containment and rails, and the effect...
Double-sided coreless linear motors have a crucial role in direct-driven precise linear motion applications. In this study, an optimum design effort focused on thrust force production is presented. For an applicable brushless linear motor structure, winding and permanent magnet (PM) dimensions which are providing the highest possible force are defined by using finite element analysis (FEA). It is...
This paper presents a computational tool intended to calculate and minimize the electric fields at ground level of High Surge Impedance Loading transmission lines. This type of transmission line achieves higher power transmission rates by utilizing optimized configuration for the phase conductors. This method is advantageous over other actions taken by the utility company such as increasing the maximum...
The aim of this paper is the multi-physical modeling of synchronous permanent magnet machines using reluctance network, lumped mechanical & thermal models. First, the modeling approaches are presented and validated by comparing the obtained results to those of finite element method. Second series of parametric studies are done to maximize the torque's mean value and reduce its ripple by acting...
Electrochemotherapy (ECT) is a local therapy used in clinical practice. This therapy improves the drug uptake of tumor tissue since it permeabilizes cell membranes by means of an electric field. Nevertheless, the tumor tissue could be characterized by inhomogeneity areas and needle electrodes could be implanted in tissue with different values of conductivity. The authors investigate by means of numerical...
The accurate knowledge of the machine parameters is a well-known important prerequisite for the inverter control design of variable speed drives. Due to the non-linear characteristics caused by cross-coupling and saturation effects the calculation of the inductances and in particular the magnetic flux of synchronous machines cannot be done straightforward. This paper presents a numerical stable method...
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