The ability to reduce operational losses and achieve higher efficiency is critical for transportation electrification applications. Doubly salient electromagnetic motors (DSEMs) have been increasingly seen as an option for electric vehicle traction. However, the efficiency of DSEMs is limited due to notable copper loss. In this article, to improve the efficiency of DSEMs, an optimal current control (OCC) strategy based on minimum copper loss is proposed and verified. By analyzing different contributions to the torque made by positive and negative phase currents, respectively, the necessity of introducing the asymmetric phase current control method is explained. The main novelty of this article is that the proposed OCC strategy not only adopts asymmetric phase current control but also regulates the field current coordinately. With the $i - \psi $ curve and Lagrange multiplier method, the optimal field and armature current combinations are obtained to minimize the copper loss. In addition, in terms of the torque deterioration caused by the limited phase current variation rate, the advanced angle control (AAC) method is adopted. Compared with the conventional control method, the system efficiency of DSEM with OCC under AAC increases from 76% to 80%, and the motor efficiency increases from 80% to 86%.
Optimal Current Control Strategy of a Four-Phase Doubly Salient Electromagnetic Motor Applied to Transportation Electrification
IEEE Transactions on Transportation Electrification ; 10 , 3 ; 6608-6617
01.09.2024
9772920 byte
Aufsatz (Zeitschrift)
Elektronische Ressource
Englisch
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