Sensitivity Analysis of a Numerical High-Frequency Impedance Model for Rotating Electrical Machines

The prediction of the high-frequency impedance response in rotating electrical machines is utilized to forecast undesired phenomena such as electromagnetic interference and leakage currents. This can be achieved in pre-prototyping design stages by building an equivalent circuit of the machine winding and estimating its parameters numerically. The main objective of this type of model is to predict the trends that the impedance curves will follow if changes on the machine design take place. This article analyzes the effect of the model input parameters on the impedance curves in the two main propagation modes. In addition, the impact of the slot geometry, material characteristics and the winding connection is studied.