Russian Federation
Purpose: To consider the problem of increasing the reliability of traction electric machines. To assess the effect of thermomechanical stresses on the service lifetime of insulating material of traction electric motors. Methods: Finite element method, implemented in SolidWorks 2005 software package, was chosen as the main method for studying and calculating temperature fields. Results: The results show that thermomechanical stresses play a significant role during dynamic thermal aging of stator winding insulation system. With dynamic temperature changes, an insulation system experiences repeated thermomechanical stresses since the coefficients of thermal expansion of insulating materials and copper conductors are different. Practical importance: The need for further study of the actual thermal state of electrical machines has been identified which will allow to a rise temperature definition accuracy, to give a warning for possible overheating in operation by that extending traction motor lifetime and reducing sudden failure likelihood. The developed methods for determining electrical machine thermal state are recommended for practical use.
locomotive traction motor, thermal processes of electrical machines
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