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In this paper, the authors present the design of a 42 V brush less DC motor for electrit fan. The main originalities of this study tonsist of its structure and the use of materials as iron powders and composite magnets. First the structure of the new fan is des<:ribed and its advantages are explained. Then the computation of a prototype parameters is detailed. In particular, the authors present the way they used to solve the problem of phases unbalante whith is a specificity of this new electric fan.