This paper proposes an analytical method which combines the superposition and the subdomain methods to predict the air-gap field distribution in permanent magnet (PM) machines with rotor eccentricity. The original machine with rotor eccentricity is divided into a number of air-gap sections along the circumferential direction. For each air-gap section, a concentric model is employed by adopting an equivalent air-gap length to predict the air-gap field by using the subdomain method. The air-gap field distribution of the original model can then be synthesised from these concentric models. Consequently, the electromagnetic performance can be predicted accordingly, such as flux-linkage, back-EMF etc. Finally, direct finite element analysis (FEA) is used to validate the efficacy of the proposed method. The proposed analytical method can be extended to other machines with different slot/pole number combinations and is particularly useful for analysing the machines with large slot and pole numbers.Index Terms-air-gap field, permanent magnet (PM) machines, rotor eccentricity, subdomain method, superposition method
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