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Optimization and performance comparisons of Induction and Synchronous Reluctance Machines considering the driving cycle of an electrical vehicle

Abstract : I. Abstract This paper aims at comparing the performances of induction and synchronous reluctance machines considering the driving cycle. The two machines have the same winding distributions on the stators and the same power inverters and batteries. The geometries and the electrical commands of these machines are optimized to minimize the total energy losses during the driving cycle. The methodology of the global optimization will be also presented in this paper. II. Introduction Today, the concerns of the energy crisis and the reduction of gas emissions stimulate the research in several electric vehicle (EV) domains. The traction in such vehicles require electrical motors with high efficiency, high ratio torque/mass, wide speed range, good overload performance under the limited battery capacity condition. As the cost of rare earth magnetic materials has increased significantly in recent years, electrical motors without permanent magnets draw more attention, such as induction motor (IM), doubly salient reluctance motor, wound-rotor synchronous motor or synchronous reluctance motor (SRM). The IM is the most used motor in industrial applications, due to its low cost, robustness and the capability of self-starting [1, 2]. Besides, in the case of traction applications, the field-oriented controlled IM is certainly a good choice as they can be usefully flux-weakened [8]. From [3, 4], the SRM is considered as a possible alternative of IM even though it has not been adopted widely in industry market yet. Under the consideration of manufacturing cost and performances (power factor, energy efficiency, torque pulsation, etc), the transverse laminated synchronous reluctance motor (TLSyRM) is chosen to be studied as it presents the advantages like simple manufacturing process, flux weakening capability, comparable energy efficiency, etc [5, 6]. Several comparisons between IM and TLSyRM (Fig.1) have been presented in previous articles [7, 8, 9] from the point of view of flux weakening capability, energy efficiency and this for different industrial applications. In this article, the two machines are compared from their energy efficiencies, the ratios torque/mass at different speeds, especially by optimizing the geometric and control parameters. (a) IM (b) TLSyRM Fig. 1 Geometrical Structure of studied machines III. Electromagnetic modelling In this part, the electromechanical behaviors of the two motors, the steady-state loss of the inverter and of the motors are presented.
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Chao Liu, Guillaume Krebs, Philippe Dessante, Claude Marchand, Jean-Claude Vannier. Optimization and performance comparisons of Induction and Synchronous Reluctance Machines considering the driving cycle of an electrical vehicle. 2015 IEEE International Electric Machines & Drives Conference (IEMDC), May 2015, Coeur d'Alene, United States. ⟨10.1109/IEMDC.2015.7409096⟩. ⟨hal-01282087⟩

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