In this paper, a new deep-slot structure of rectangular shape for an induction motor (IM) is proposed. This is obtained by inserting a ferromagnetic massive piece in it. This leads to good starting characteristics of the motor when compared to the conventional shape, i.e., without ferromagnetic massive piece. Two structures of IM were studied: one having the proposed deepslots and the other presenting conventional deep-slots. To see the influence on the start-up characteristics of the IM, the considered approach is divided in two parts. First, in order to take into account the slot’s shape and the skin effect, finite element method is used. The results are compared to those obtained using circuit analysis method. A good agreement is achieved. Aiming to attain global performances, a dynamic modeling of the IM using variable parameters is carried out. The obtained results are presented and discussed.

Keywords: Deep-slot, Induction motor (IM), Ferromagnetic massive piece, Skin effect, Dynamic modeling