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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...
This paper presents a method for the identification of winding failures in induction motors. The types of failures include unbalanced currents flowing into the motor and short-circuit of the winding. The radiated magnetic field of a typical induction motor was studied while various types of failures applied to the machine. The implementation was performed by applying different types of unbalanced...
This paper presents a high-frequency (HF) model and the parameter identification of electrical machines in hybrid or electric vehicles. For improved results, the winding design in the finite element analysis (FEA) considers individual wires and parallel wire strands. A linear approximation of the BH characteristic of the iron sheets is carried out for the determination of the frequency dependent self...
In this paper, a detailed comparison of theoretical and numerical modeling methods of large-scale high-temperature superconducting (HTS) synchronous generator is carried out. The Maxwell's equations are employed to obtain the theoretical magnetic model of the generator. In addition, the finite-element method has been considered to achieve an accurate model of the machine. The results are validated...
We present a notional design for a special, high short-circuit impedance electrical transformer. The technical solution that provides for a high short-circuit voltage concerns the usage of magnetic shunts placed between the windings. This paper reports analytic sizing recipes based on 2D models for the electromagnetic field for sizing medium power units. A more complex, 3D model is used to evaluate...
Accurate inductance calculation of permanent-magnet synchronous machines is an important topic, since the inductances determine a large part of the machine behaviour. As the inductances and the permanent flux are saturation-dependent, their analytical calculation pose a challenge. Saturation-dependent poleform coefficients are in common use for calculating the magnetic circuit of salient-pole synchronous...
This paper presents the analyses of thrust and normal forces of linear induction motor (LIM) segments which are implemented in a rotating ring system. To obtain magnetic levitation in a cost effective and sustainable way, decoupled control of thrust and normal forces is required. This study includes the design of a static test setup from which the measurement results are compared and verified with...
In this paper, we derive equivalent circuits for high frequency multiwinding magnetic components from finite element (FE) computations. Lumped parameter models are first presented, based on previously published work. All parameters of these circuits can be interpreted as the results of open and short-circuit tests on the transformer. Based on this consideration, numerical procedures are then proposed...
This paper presents the different calculating methods of stator end turn leakage inductance at brushless dc motors (BLDC) with different winding types. The calculations are carried both analytically and numerically. The results of the two dimensional (2D) calculations have been compared with the results of three dimensional (3D) ones for the same motor. Finite Element Method (FEM) is used for 2D and...
The paper presents a 3D numerical analysis of the thermal behavior of a small permanent magnet DC motor, performed by Finite Element Method (FEM). The accuracy of the computed temperatures was confirmed by comparison with experimental results; a prototype of the motor was tested in the steady-state in order to calibrate the numerical model. The motor was subsequently analyzed using a transient heat...
In this paper an analytical model of continuously transposed cable (CTC) windings is proposed and short circuit condition in these types of windings is simulated. The proposed model is developed to calculate the current distribution in all strands of CTC windings in faulty and no-fault condition. The model is based on the finite element method (FEM) and takes into account the ??skin effect?? impact...
This paper shows the reliability of fault detection on electrical machines by analysis of the low frequency magnetic stray field. It is based on our own experience about magnetic discretion of naval electrical propulsion machine. We try to apply the techniques developed in previous works on the subject to faults detection. In this paper we focus on rotor defaults in a synchronous generator (eccentricity...
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