NOMENCLATURE

Abstract—This paper extends the winding function theory for nonuniform air gap in rotating electric machinery. It shows that the winding function differs from that used in the symmetrical case, al-though several papers employ the uniform air-gap winding func-tion to study electric motor performance under fault conditions. The extended theory will be particularly helpful in the study of squirrel-cage induction motors with a nonuniform air gap such as that caused by eccentricity of the rotor and stator. Index Terms—Eccentricity, electric machinery, nonuniform air gap, winding function theory