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An improved analysis method to calculate the eddy-current losses in large power transformer tank walls is presented. In this model, the perpendicular magnetic flux density has been obtained at discrete points on the surface of the tank by the finite-element method (FEM). A double Fourier series is adopted to express the obtained magnetic flux density by analytical formulas. The coefficients of the...
This paper presents a novel strategy to model the structures in the end winding of flameproof motor and calculate the magnetic field in this region. The three dimensional (3-D) nonlinear anisotropic magnetic field including the eddy current losses is calculated by utilizing the magnetic vector potential formulation. With the help of Biot-Savart's law, the magnetic field caused by the currents in the...
Pulse width modulation (PWM) inverters are widely applied to control motors. It will often increase the eddy current losses in the motors. In this paper, the authors deal with the effects of eddy current losses with amplitude modulation and switching frequency in an induction motor fed by PWM Inverter. The method is employed by a time-stepping finite element analysis (FEA). The FEA model of motor...
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