In order to handle the responsiveness of a magnetic field against a current waveform that is superimposed by a higher harmonic with a small amplitude for the direct current component, a magnetic field analysis that accounts for material modeling needs to be carried out. With a magnetic field analysis, it is possible to analyze the machine characteristics from the magnetic flux density distribution.
This Application Note presents the use of the frozen permeability condition to obtain the superimposed direct current characteristic that includes minor hysteresis loops of a high-frequency reactor.
Superimposed direct current characteristics, Magnetic flux density distribution
This section shows the superimposed direct current characteristics in fig. 1 and the core’s magnetic flux density distribution in fig. 2 as analysis results of the reactor described.
From fig. 1, it is apparent that the inductance decreases more rapidly as the direct current increases. This is caused by influence from magnetic saturation, as shown in fig. 2.