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The paper presents the results of field calculations of cogging torque of a 12-pole torque motor with an 18-slot stator. A constant angular velocity of the magnet and the same size gap between n-1 magnets were assumed. In these conditions, the effect of change of the nth gap between magnets on the cogging torque was tested. Due to considerable length of the machine the calculations were performed...
The aim of the paper is to develop a model of the ignition system for combustion engines with spark ignition described by two-port network equations. The mathematical calculations based on generalized parameters of a two-port network were used to develop the model. This allowed for the analysis of voltages and currents on the terminals of the model (without calculating voltages and currents inside...
The paper presents results of a research study on the nature of energy flow of an axial flux signal of an induction motor between two adjacent frequency bandwidths in steady-state and depending on the machine load. Existing periodic energy flows of this diagnostic hamper both fault or damage detection and identification. To ensure a sufficient resolution of diagnostic systems it is required to separate...
The paper presents the possibility of using a two-dimensional field-circuit model of a squirrel cage induction motor for qualitative tests of the axial leakage flux course used in non-invasive diagnostics of induction machines. The study considered the reduction of leakage fluxes associated with the stator and rotor winding to the zero component of the symmetric components system. A qualitative comparison...
A new cantilever-beam nonlinear electromagnetic vibration energy harvester with noticeable effects of complex motion composed of relative displacement and torsion of the vibrating element is considered. The analysis of frequency characteristics carried out using the finite element models shows significant differences regarding generated output voltage and frequency bandwidth when detailed 2-d variations...
In this paper, an efficient methodology for the optimal design of new metamaterial-based slabs is proposed for the signal amplification of receiving planar patch antennas. Notably higher induced currents are achieved, while numerical simulations verify the high performance of the featured structure.
Results of research on the influence of different load on current transformers' transformation errors when cores consist of two different magnetic materials are presented in this paper. Analyses of the electromagnetic field distribution for different cases of load of the secondary winding were performed (magnetic field distributions of current transformers, current error and phase displacement diagrams)...
In this paper, a Mixed Method using the Finite Element (FEM) and the meshless Natural Element Method (NEM) is used to determine the magnetic flux distribution in magnetic circuit of an electrical machine. In this solution, the NEM is applied exclusively in the gap of the machine where the largest deformations of the mesh are expected when the movement occurs. Due the use of anti-periodic boundary...
Magnetic measurements have shown that the most dynamo steel sheets have certain anisotropic properties, which are due to the occurrence of certain textures in these sheets. These anisotropic properties have been taken into account in a simplified way assuming that iron particles of the dynamo sheets have only one axis of the easy magnetization. In the proposed approach, these particles are treated...
This paper proposes a novel reactive power control strategy based on virtual flux droop method. Firstly, flux droop control method is derived, where comlicated multiple feedback loops and parameter regulation are avoided. Next, the factors influencing reactive power sharing are theoretically analysed in virtual flux control. Then, a novel reactive power droop controller is designed which consists...
Core optimization, realization of new core shapes and powering the motor at high frequency are some of the reasons to use new materials, those limit the core loss and/or have quasi-isotropic properties in any magnetization direction. In addition, commonly used punching of laminations, causes degradation of a core portions, impairing operating parameters of the motor. In this case, a very good solution...
The electric motor's dynamics is a problem analyzed for many years. Many researchers solved this problem, for example by the design optimization or by use of electronic systems and determination of special control conditions. In the case of low-power motors, cost of production is the most important component of the final product price. The authors of this paper attempt to improve the dynamic of 120...
The control and steering system for testing flow is presented in this publication. Multi-phase flow measurement technologies are still built and improved. There is a clear trend in the industry to implement more optimum related functions, where the focus is on active control and the monitoring system. Control related active optimum functions can only be realized with a system that allows electronic...
This paper presents a nondestructive method of brick wall dampness testing in real building structures. The setup was used to determine the moisture of test brick walls on the specially built laboratory models. The topological method and the gradient technique are used to optimization approach. The level set function was used to solve the inverse problem in the electrical impedance tomography. The...
Conductors with rectangular cross-section are key components of industrial busbar systems, where each phase can have several parallel conductors to carry high currents. The current density in each conductor, under sinusoidal conditions, is not uniform, due to skin and proximity effects. As there are no closed analytical formulae for conductors with rectangular cross-section, many numerical simulations...
In this paper a terahertz computed tomography (THz CT) system with pulsed excitation is presented. In case of this method for each position/pixel, the time signal is recorded (in contrast to x-ray tomography, where just a single value is obtained). Based on acquired waveform many features can be calculated. For this reason multi-parametric reconstruction algorithm is proposed: tomographic reconstruction...
Progress in field of electrical machines diagnosis and artificial intelligence contributed to increased interest in new methods of diagnosis in field of electrical motors. The paper focused on three numerical techniques: finite element analysis, signal analysis and artificial neural networks in diagnosis of a squirrel cage induction machine under inter-turn short circuit in stator windings. A field-circuit...
Electrical impedance tomography (EIT) reconstructs the conductivity distribution of a domain using electrical data on its boundary. Shape derivatives and topological derivatives have been incorporated into level set methods to investigate shape optimization problems. The shape derivative measures the sensitivity of boundary perturbations while the topological derivative measures the sensitivity of...
This paper presents a nondestructive method of testing flood embankment dampness. We used a setup made of specially built laboratory models to determine the moisture level of flood embankments. The proposed algorithm was initialized by using one step methods and topological sensitivity analysis. We constructed the forward model and we solved the inverse problem in order to visualize moisture inside...
In their daily practice, academics frequently face lack of access to modern equipment and devices, which are currently in use on the market. Moreover, many students have problems with understanding issues connected to mechatronics due to the complexity, necessity of abstract thinking and the fact that those concepts are not fully tangible. Many studies indicate that virtual reality can be successfully...
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