1 Proceedings of 19th International Conference. Mechanika 2014. Stress analysis of the cage rotor structural elements K. Bećić*, B. Šarić**, A. Mustafić*** * Faculty of Mechanical Engineering, University of Tuzla, Univerzitetska 4., 75000 Tuzla, Bosnia and Herzegovina, E-mail: kazafer.becic@bih.net.ba ** Faculty of Mechanical Engineering, University of Tuzla, Univerzitetska 4., 75000 Tuzla, Bosnia and Herzegovina, E-mail: bsaric_mf@hotmail.com *** Faculty of Mechanical Engineering, University of Tuzla, Univerzitetska 4., 75000 Tuzla, Bosnia and Herzegovina, E-mail: adnan.mustafic@untz.ba Summary State of stress in the rotor winding, cage of high voltage asynchronous motor, at the connection point of rods with end rings, caused by various causes significantly affect the lifespan, reliability and the safety in the work of the total drive, that in preparing and the reparation of high voltage of the cage the rotor asynchronous motors must be taken into con- sideration. To obtain the temperature image in of high voltage cage the rotor motor we use software package "Comet" which is based at mathematical model of thermo-elastic solid body and the at numerical finite volume method Residual stresses as a result of mechanical processing and the welding, exceed the strength, which can result in fracture of structural elements in the area of welded structure connected point. By microstructural analysis we are determining characteristics present in the material, which are a function of the com- position and the shape of the starting material, and any subsequent heat treatment or processing procedure that is ap- plied to the material. KEY WORDS: cage rotor construction, stress state, temperature picture, microstructural analysis 1. Introduction Numerical calculation of relevant and influential parameters that characterize the thermal and mechanical stress of the rotor windings of high voltage cage induction motors are based on the defined mathematical model, using modern com- puter programs Comet and Adina. When measuring stress distinguish the design elements that measure certain parame- ters that lead to changes in the shape and the failure of the rotor winding of high voltage asynchronous electric motors. Metallographic analysis and other tests of the joined elements which verifies changes in the microstructure of structural elements, showing changes resulting from the influence of mechanical processing and heat input while connecting. 2. Second Determination of the mechanical properties of joints Determination and analysis of the stresses in the structure, on the basis of the temperature state measured on the connec- tion point of the rod and the ring of the rotor of the high engine (Fig. 2). Relaying on the final small size properties of infinitely small sizes in the calculations entries error which is insignificant for technical practice. For this reason, the stress can be considered as a continuous function of coordinates [1]: pn=pn(x, y, z), n=n(x, y, z), n=n(x, y, z) (1) so we can talk about their derivations and differentials of the first and higher order. Total strain n p  in the point of the body M (Fig. 2) depends on the orientation of the observed plane. It should be proved that it is sufficient to know the stresses in three mutually perpendicular planes, on which one can determine the total strain in an arbitrary plane passing through a given point of deformed body.