Abstract
The aim of this paper is first calculating the airgap magnetic permeance in a mixed eccentricity condition. This is done by studying the governing geometric conditions of the airgap. A novel and precise distribution of the airgap permeance is introduced and compared with those available in the literature. Moreover, by reviewing and extending the winding function theory for a nonuniform airgap, the general equations for evaluating the inductances of a three-phase squirrel-cage induction motor with a mixed eccentricity condition is presented. Various inductances of the motor are then calculated using the airgap permeance distribution and inductance equations, which lead to precise and closed form analytical expressions. In this calculation, skewing of the rotor bars is taken into account. Finally, the performance of a three-phase squirrel-cage induction motor with a mixed eccentricity is simulated and analyzed.
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