Equivalent circuit modeling for transient analysis of induction motors with three dimensional finite element analysis

In the analysis of traction motors, the transient analysis is important because the motor is used in transient state. Among transient analysis methods, the d-q axis transform is well known. But in the transient state, the equivalent parameters such as mutual and leakage inductance are changed, because of the change of magnetic permeability and current density. In this paper, these parameters are calculated through finite element analysis. The magnetic field analysis of an induction motor is accomplished in a 3-D model and the inductances are calculated from flux linkage through stator and rotor current path. Using these results, d-q transform analysis is performed, and the algorithm is applied to the analysis of a real motor.