Induction motors are often subjected to stress caused by repeated fast and short torque transients. These working conditions could lead to overheating some parts of the motor, among which the most sensitive are the stator windings. This thesis deals with the implementation of a temperature estimator of the stator windings obtained through a first order thermal model. The first step of the project concerns the development of a model which is capable to simulate and evaluate the dynamic and magnetic parameters of the induction motor in different working condition. In particular joule losses, iron losses and magnetic saturation are taken in account and the reference frames used to model the motor are: three-phase time-domain (a,b,c), stationary (α,β) and rotating frame (d,q).