Rotational magnetic field under the effect of saturation in rotational three-phase electrical machines
DOI:
https://doi.org/10.15665/rp.v23i2.3818Keywords:
Clarke Transform, Harmonic distortion, Park transform, Rotational magnetic field, Three-phase electrical machineAbstract
The rotational magnetic field belongs to the classic topics of literature, regarding rotating electric machines in alternating current, however, from the literature it has been assumed that it describes a perfect circle around the stator. Previous studies have used models to estimate the behavior of the flow inside the machine, but the shape of the magnetic field face to the presence of saturation or harmonics is not clarified. This article shows the modeling of a three-phase stator of an electrical machine with concentrated windings, diametral pitch, two poles, at 60 Hz, built with magnetic material whose magnetization curve represents the nonlinear behavior of the core. The objective of the model is to evaluate the shape of the rotational magnetic field, obtained in front of different operating scenarios of the magnetization point, for this, the three-phase flux densities are projected in the ∞-ꞵ plane using the Clarke transform; where the shape of the rotating magnetic field is evaluated. The analysis is deepened with the projections of the ∞-ꞵ components on a synchronous reference frame dq, through the use of the Park transform. To obtain conclusions, the fast Fourier transform was applied to the components of the rotational magnetic field in dq and to the original magnetic flux densities, establishing the respective relationships with the shapes of the rotational magnetic field obtained. The tool used for the study was the environment Simulink of Matlab, which demonstrates that the magnetic field acquires a hexagonal shape as saturation becomes relevant, this due to the harmonic deformation present in the flux densities and the appearance of harmonics in the projection of the magnetic field on the direct axis.
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