Investigation of Core Loss in Electric Vehicle Induction Motor Using Finite Element Analysis for Performance Enhancement

Temperature rise in a 3ϕ, Totally Enclosed Fan Cooled (TEFC)., Squirrel Cage Induction Motor (SCIM) used in Electric Vehicles (EV) is effected by core loss. The temperature rise is a function of core loss and other losses. Since, the core loss components eddy current and hysteresis losses are a function of flux and flux density, Finite Element Method (FEM) is used to obtain average maximum flux density at different loads. Core loss is varying with respect to load and hence temperature rise, resistance value, starting torque to maximum torque $(\displaystyle \frac{T_{st}}{T_{\max}})$ ratio and current drawn at $(\displaystyle \frac{T_{st}}{T_{\max}})$ also varies which is so far assumed constant in reality. The analysis is made on the effect of core loss on SCIM used in EV for performance enhancement. The results reveals that when the variable core loss is considered, temperature rise is reduced and the SCIM rating is enhanced for 20%.