Concerning the optimal exploitation of the material, the sheet metal cost imposes to minimize blanking scraps; this has led to the development of the tendency of producing the stator by assembling its small-size portions, purposely drawn from sheet metal zones otherwise eliminated as scrap. The single poles of a stator lamination are then blanked one by one, to be first assembled in stator poles, called “T Poles”, and successively, assembled to form the stator in its definitive geometry.
Talking about the drastic reduction of the productive process cost, linked with the capability of automating the process itself, it is necessary to take into account that the productive process of “Backlack” stacks needs several stages: handling of single laminations, assembly of stacks , loading and unloading of the equipment used in the thermal cycle, thermal cycle, machining of the produced stacks and final packaging. Hence the choice of the opportune automation is influenced by countless factors.To realize the production cycle, loose lamination stacks must be placed inside proper equipments, to be designed case by case, which, besides determining the quality of the produced stacks , at the same time establish the quantity of used energy. Finally, the choice of the heating and cooling process depends on the choice of the automation degree of the productive process in its whole, which in its turn influences the definition of the necessary equipment.