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Abstract

This paper presents the modeling by Magnetic Equivalent Circuit model (MEC) of a Simple Excited Automotive Alternator (SE2A) where DC-excitation winding is transferred from rotor side to stator one rather than in conventional automotive claw pole alternators, to overcome the disadvantages of the ring-brush system. Following the resolution of the MEC using Newthon-Raphson numerical method, the alternator performances at both no-load and under resistive load regimes are achieved considering the saturation effect. It has been found that alternator’s performances carried out using the proposed MEC are with closed proximity to experimental records on a built prototype of the considered alternator. Then, a modified SE2A is proposed by the integrating Barium ferrites permanent magnets between adjacent rotor claws in order to combine the high-energy density of permanent magnets with the commonly controllability. This configuration is named the Hybrid Excited Automotive Alternator (HE2A). The improvement of its topology performance is provided through the optimization of the device topology based on a Sequential Quadratic Programming (SQP) coupled to a magnetic equivalent circuit considering iron losses minimization case. It has been found that the efficiency of the alternator could be improved especially at high speed rate.

Keywords

Claw pole alternator simple excitation experimental tests hybridization optimization iron losses

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MEC-based study of a transformed embedded alternator

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