| Abstrakt: |
We present an analytical model of permanent-magnet five-phase synchronous machines including the third space harmonic of the airgap induction, which is generally disregarded by most authors, despite its relevance for the estimation of the machine behavior. Firstly, we address the numerical estimation of the self and mutual inductances required by the model using the machine dimensions and winding characteristics. Afterward, we derive a model in the stator reference frame, which is subsequently simplified through complex coordinate transformations, thus resulting in a set of simpler, decoupled equations expressed in the stator reference frame. Then, to test and validate the model, it was applied to two prototype machines available in our laboratory. We designed the rotor of these two machines so that each has a different amplitude for the third harmonic of the airgap induction. Finally, to further validate the model, analytical results were compared with corresponding results obtained through finite element analyses and also through practical experiments, from which an excellent agreement emerged between the three types of results. The results obtained with the finite element method and through experiments also proved not only that the model is consistent and valid, but also that it can be used to predict the machine behavior under normal and faulty operation. [ABSTRACT FROM AUTHOR] |
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