Thermal behavior on Productive Torque in Electric Vehicle Motor using Computational Methods

Thermal behavior of 3 phase Squirrel Cage Induction Motor (SCIM) has impact on torque production in Electric Vehicles (EV). Temperature rise is affecting the torque production of SCIM, particularly in terrain applications. A generalized mathematical model is needed to predict the temperature rise for different ratings of the motor. This paper carries out the research on the generalized mathematical model of 15 kW TEFC SCIM using the Finite Element Method (FEM). The regression technique is adopted to predict the temperature rise for various ratings for 160L frame of SCIM. Regression analysis for prediction of temperature rise in various parts of 9.3 kW rating of motor under various loads is performed by considering the slip, rotor speed and joule's losses. The temperature rise can be predicted from SCIM using generalized regression equations by without re-meshing of the model. The obtained temperature is used to estimate starting torque and full load torque. From the computation, it is observed that, the relative percentage error for change in load from 3/4th to full load is increased to 4.4% due to temperature rise. Impact of thermal behaviour on productive torque is analyzed for given SCIM used in EV.