Analytical and Experimental Approaches to Predicting Magnetic Field Asymmetry and Electromagnetic Forces in Slotted Surface-Mounted Permanent Magnet Machines With Rotor Eccentricity

This article presents an electromagnetic analysis and experimental study of permanent magnet synchronous machines (PMSMs) considering eccentricity. Rotor eccentricity caused by defects in the manufacturing or operational processes of PMSMs affects electromagnetic performances. Although rotor eccentricity can be identified using finite element analysis (FEA), the analysis is time-consuming, and understanding the direct physical relationship between eccentricity and design variables is challenging. Therefore, an analytical approach based on the electromagnetic governing equations was employed to analyze the impact of eccentricity on the design variables. The analysis results are compared with FEA and experimental results to verify the validity of the subdomain method.