Representation of iron core and dielectric losses for calculation of common mode stator ground currents in inverter-fed AC machines

A time-domain high frequency model of an induction machine, which is based on the design parameters, is proposed for calculation of common mode (CM) stator ground currents in inverter-fed AC machines. Basically, the model is an extension of the measured frequency response models and considers an adequate representation of the iron core and dielectric losses over a wide frequency range, e.g. 1 kHz-10 MHz. The proposed model eliminates the disadvantages of the transmission line models, when they are used in the design stage to calculate the CM currents.