Computation of Thermal Condition in an Induction Motor during Star-Delta Starting

摘要

The problem of two-dimensional heat flow in the stator of induction motor is solved by use of a finite element formulation and arch-shaped elements in the r-θ plane of the cylindrical co-ordinate system. The shape functions and exact solution matrices are derived algebraically for utmost economy in computation. The temperature distribution has been determined considering convection from the stator frame and cylindrical air-gap surface. Finally, the temperatures obtained by this two-dimensional approximation have been compared for different stator currents considering the time required for each stator current during the transient in star delta starting.