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Power electronic designers are interested in characterization of the magnetic cores permeability up to 10MHz and at high induction level. To achieve this aim, different experimental setups are used to measure mutual impedance spectra. First, impedance measurement methods are carried out on toroidal wound core of 20 μm nanocrystalline ribbons. Measurement uncertainties are estimated and a confidence...
The design of an electric machine should be done paying attention to core losses. This paper provides an analytical computation of the stator magnetic flux density distribution in an interior permanent magnet synchronous machine and of the related iron losses. The magnetic flux density waveform in the stator teeth and its 2D distribution in the stator yoke are obtained under load condition using an...
This paper deals with the iron loss in the electrical machines. A dynamic hysteresis model (LS model) is established for the noble material AFK502 through a series of Epstein frame measurements. The comparisons are provided between the reconstructed B-H loops and the measured loops, and also the corresponding losses. This model, coupled with the numerical method, is then used in an efficient manner...
This paper presents a hybrid excitation synchronous machine which combines a permanent magnet excitation with a wound field one. With two sources of flux, this kind of machines is cited more and more frequently in vehicle application for easier control of flux. After a brief description of the structure, some methods will be presented to improve the performances of this machine. Simulation results...
Most soft materials used in power electrical devices adopt more or less organized small structures with domains and walls. Microscopic eddy currents are therefore induced with time varying fields, they give rise to excess losses and dynamic hysteresis. In this paper, we first introduce magnetic and electric dynamic properties and dedicated formulations usable within numerical simulation tools. We...
We consider taking both microscopic excess and macroscopic classical induced losses and damping, occurring within bulk and laminated soft magnetic materials, into account. We won't detail actual eddy currents distributions but use homogenizing techniques and variational principles to derive a dedicated formulation with respect to the magnetic vector potential. At last some two-dimensional results...
The possibility to introduce microscopic dissipative processes before solving a macroscopic magnetodynamic problem is investigated. Both scales are derived from the same energy-based description
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