High-Frequency Modelling of Rotating Electrical Machines

The objective of the present dissertation is to study the high-frequency response of rotating electrical machines. The study of the physical phenomenom is initially tackled by performing a comprehensive analysis of different modelling methodologies and trends. The main core of the thesis focusses on developing and validating a deterministic modelling method that provides an estimation of the machine impedances in a high-frequency band (i.e., from tenths of kHz to thenths of MHz depending on the objective). This prediction is aimed to favor an EMI-aware design of the rotating machine at early stages when a physical prototype is not yet available.

The developed modelling method is implemented and validated for two different PMSMs utilized in the automotive industry. These two machines are selected taking into account the INTERACT project boundaries and partners.
The work presented in this dissertation gave rise to some original contributions shared in peer reviewed international conferences and journals. These research documents are already published or in process of publication. Further information about published material is provided in the section ‘List of publications’. The most important contributions developed in this dissertation are:
• The development and validation of a high-frequency impedance model oriented towards early prediction for PMSMs
• The detailed experimental investigation of the effect of PMSM rotor and housing on the high-frequency impedance response
• The detailed experimental investigation of the rotor DC field effect on the high-frequency impedance response in PMSMs
• A thorough numerical investigation of the effect of the machine configuration, geometry and material characteristics on the high-frequency impedance response.