标题：DEVELOPMENT OF CORES FOR MINI MOTORS FROM LAMINATED SHEETS OF ELECTRIC STEEL ABNT (Brazilian Association of Technical Standards) 35F 420M WITH THERMAL TREATMENT
摘要：The purposes of this paper were to study the thermal treatment of Fe-Si sheet, as well as the
sheet cutting concerning the topology of a mini stepper motor and mini motor simulation using
finite element software. The research consisted of the execution of an "Inductive Reheating"
thermal treatment of Iron Silicon sheets, NM71-2000/35F 420M with GNO (Grain Non
Oriented), and 0.35mm width. The new technique has the benefit of minimizing magnetic losses
produced by the cut on the edge of electric sheets. To carry out the process, the system includes
a furnace, an induction coil, and a power supply that, when activated in a controlled way,
causes relevant changes to the crystalline structure of the material. Related to the cut of the
sheets, the topology of a three phase mini stepper motor was considered. The sheets were
initially cut using the geometry of the rotor and stator cores. Firstly, a die cutting process was
used and later a wire electroerosion cutting process was employed, which provided parts with
excellent finishing. Finally, the mini motor was simulated using the finite element software
FEMM 4.2 in order to analyze the airgap flow and torque development of the axis end, in
comparison to a solid block of the same material (Fe-Si).
