A Generalized Equivalent Source Model of AC Electric Machines for Numerical Electromagnetic Field Signature Studies

A generalized equivalent source model of AC machine for electromagnetic signature studies is proposed to provide the exact field solution without the need for using large numerical or analytical computation efforts. The model was created using a wire-modeling of the machine windings designed based on the electric displacement field and current density of the actual machine. In addition, an optimization process is implemented to have a comprehensive equivalent model that is appropriate for various geometrical sizes and terminal voltages. A finite element model was employed for developing the equivalent source model. For verification, the radiated field results, from both the detailed AC machine numerical models and the equivalent source models for various operational cases, are studied and compared. The results of the equivalent source model match the results from the detailed machine models. Using the equivalent source model, we can evaluate radiation and stray field effects for electromagnetic compatibility (EMC) and standard evaluation studies with a small computational effort.