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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...
A mix of simplex algorithm and simulated annealing method to evaluate the Jiles-Atherton (JA) hysteresis modelpsilas parameter set is proposed in this paper. It is cost less time in evaluating the parameter set of Jiles-Atherton hysteresis model by this method. And during the search performance, the local extreme value can be avoided effectively. The curve which calculated using the obtained parameter...
Based on the finite element analysis, the leakage magnetic field and the short circuit force of SFPZ-180000 kVA power transformer under the short circuit in the low voltage winding are calculated. The distributions of the leakage magnetic field and the short circuit force in low voltage windings and high voltage windings are analyzed in three different conditions when the power transformer is under...
Method for 3D dynamic finite element analysis of electromagnetic problems involving movement was presented, in which the external circuits, nonlinear magnetic properties, eddy-current effects and movement are taken into account. In the method, the problem of voltage excitation problem was solved by the field-circuit directly coupled technique, and the 3D electromagnetic torque was calculated through...
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