Có 20+ tài liệu thuộc chủ đề "ứng dụng điện tử"
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Khi lan truyền trường điện từ mang theo năng lượng, tín hiệu.. Độ lớn năng lượng bức xạ phụ thuộc vào độ lớn và tần số biến thiên của dòng điện, điện tích trong nguồn, phụ thuộc vào cấu trúc của nguồn, vào tính chất của môi trường bao quanh nguồn.. Đối với tần số công nghiệp 50 Hz, công...
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The measured curve considered in this study corresponds to the line-to-line voltage in the primary, and to the current of the phase A of the primary winding.. For both methods, the leakage in- ductances L σ 1 , L σ 2 of the primary and secondary windings, as well as the zero-sequence inductances L 01 , L 02 are considered...
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RECENT DEVELOPMENTS OF ELECTRICAL DRIVES. Recent Developments of Electrical Drives. Coupled Model for the Interior Type Permanent Magnet Synchronous Motors at Different Speeds. A General Description of High-Frequency Position Estimators for Interior Permanent-Magnet Synchronous Motors. Wide-Speed Operation of Direct Torque-Controlled Interior Permanent-Magnet Synchronous Motors. Electrical Drives Applications. Kladas and J.A.Tegopoulos. r Permanent Magnet Machines
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The book is composed of the papers, which were presented at the XVI International Conference on Electrical Machines—ICEM’2004, which was held in Cracow, Poland, on September 5–8, 2004. r Computer modeling of wide range of electrical drives while the models are validated by experimental measurements. r Development of the software methodology, dedicated for 3D structure modeling by means of solid...
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GENERATORS: ANALYSIS OF NO-LOAD CORE LOSS BY 3D MAGNETIC FIELD. Magnetic field analysis of no-load core loss in turbine generators is described. The losses in laminated steel sheets are calculated from the results of finite element magnetic field analysis. The additional losses in metal portions other than the steel sheets are also calculated. The sums of these losses were compared...
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LOSSES IN LARGE HYDRO-GENERATORS USING STATISTICAL METHODS. A very important issue during the electrical design of hydro-generators is the reliability of the loss calculation in the manufacturer’s design calculation program. This paper presents the optimization of the loss calculation in a design program for salient pole synchronous machines. Statistical methods are used to calibrate the loss calculation with measurements made...
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Mueller, “Comparison of Different Numerical Approaches for the Calculation of Eddy Current Losses in Large Synchronous Generators”, Proceedings of the Seventh International Conference on Modeling and Simulation of Electrical Machines, Converters and Systems, ELECTRIMACS, Montreal, Canada, 2002.. Schwery, “3D Nonlinear Transient Finite Element Analysis of Eddy Currents in the Stator Clamping System of Large Hydro Generators”, Proceedings of the 16th...
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The permanent magnets influence about the transient behavior of the PMSM is very important. As higher are the equivalent currents of the magnets as lower are the slips of the transient response. 18 we can observe that if the current of the magnet decrease below a certain value the motor is not capable of take up the overload and the...
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The correlation between experimental and simulated results is very good, giving confi- dence in the model, which can then be used to investigate the machine performance under various loading conditions.. 9 shows the variation in the total three-phase power at the output obtained by subtracting the I 2 R loss from the product of no-load emf and generator current. There...
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In the table first calculated U-shapeA results are calculated with the design with same total magnet length and thickness per pole than with V-shape design. The second calculated results U-shapeB are calculated with design with longer and thinner magnets per pole.. Magnets thickness, width, and area are also shown in the table with unit of mm. The maximum output torque...
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Magnet Span[Electrical degree]. Average torque vs. allows to reduce the amplitude of the cogging torque. Assuming that the phase currents are function of the electrical rotor position θ (self- controlled PM motor), the electromagnetic torque T em , which is the sum of the cogging torque, T c and the current-magnets interaction torque T e − i , can be...
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Generated meshes for the shit larger than one third of the air gap width.. Taking into account the stator node with number j neighboring with nodes i and i + 1 of the rotor mesh, f the linear interpolation the equation for this node can be described as follows (5):. 0 (5) Where θ i is the angle between nodes...
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Functional block of the FEM computation.. Characteristics of the asynchronous motor drive Asynchronous motor Frequency converter. and the load torque on the shaft are given as input variables and the phase currents, electromagnetic torque, rotor position, and the stator flux linkage are obtained as output variables.. The mathematical coupling between the FEM model and SIMULINK is weak, which means that...
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An inverter driven induction motor can be modeled by combining the space phasor model of the machine with the supply model representing the non-sinusoidal voltage source inverter.. All electromagnetic terms in (15) and (16) are expressed as space phasors by advancing from the actual three-phase machine model to an orthogonal model with alpha-beta and d-q windings, the voltages and currents...
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σ is a factor which varies with λ (wavelength) and the diameter of the machine. It appears that I (x) is inversely proportional to the order of the mode, in addition the acoustic intensity is proportional to the square of the vibration amplitude. The spectrum of the total noise obtained by our analytical model is presented below (Fig. Spectrum of...
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The consideration of both the original circuits and the additional fictive current distributions as line circuits enables the application of Biot-Savart’s law in the following form:. In a numerical computation of the flux density B generated by a three-dimensional assembly of line circuits, these can be modeled by discrete line circuit segments. The three-dimensional distribution of electromagnetic forces can afterward...
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In order to reduce the cost and the weight of this drive an optimization of the main dimensions of each component considered as an interacting part of the whole system is conducted. With this procedure, the optimization is no longer limited to the fitting between separated elements but is extended to the system whose parameters are issued from the primitive...
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OF HIGH-FREQUENCY POSITION ESTIMATORS FOR INTERIOR. This paper discusses fundamental equations used in high-frequency signal based interior permanent-magnet synchronous motor (IPMSM) position estimators. For this purpose, an IPMSM model is presented that takes into account the nonlinear magnetic condition, the magnetic interaction between the two orthogonal magnetic axes and the multiple saliencies. Simulation results reveal the position estimation error caused...
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Consequently, the model in (22) or (24) introduces an estimation error. Compensating this error is done in [5,6] by measuring the error during the self- commissioning of the drive. The error on θ r is zero if the magnetizing current is aligned with one of the magnetic axes. The higher the deviation of i m from the d-axis, the higher...
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Specifications of the tested motor. 8 illustrates the performance in the steady state. The measured and estimated rotor position of the middle speed and high-speed operation are shown. From the figure, the accuracy estimation results are obtained even if the high-speed region.. 9 show the output of the estimation error correct function K y . And K y is also...