Transient model to study voltage distribution in electrical machine windings considering the rotor

摘要

Stator machine windings are submitted to transient overvoltages when a surge achieves the line-end coils. The study of transient voltage distribution between turns and coils is an important step for the effectiveness of the machine?s design. Several previous works investigate this voltage distribution by using simulation models or by means of measurement results. Nevertheless, it was not found in the literature any work that takes the rotor into account. Therefore, this paper aims at verifying the influence of the rotor in the transient voltage distribution inside the machine by numerical simulations. To obtain the results a complete model is used, in which transient magnetic fields and electric circuit elements are coupled. The calculation of the electric circuit parameters and the performing of the transient simulations are done by using Finite Elements Method. The transient model of each individual coil of the model is validated by measurement results. The simulations show that the rotor, indeed, has influence in transient voltage distribution, mainly for the coils other than the first.