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2014-06-15
Analytical Derivation of Induction Motors Inductances Under Eccentricity Conditions
By
Hossein Hooshmandi Safa,

    Dr. Hossein Hooshmandi Safa

    Department of Electrical and Computer Engineering

    Isfahan University of Technology

    Iran

    Homepage

Mohammad Ebrahimi,

    Dr. Mohammad Ebrahimi

    Department of Electrical and Computer Engineering

    Isfahan University of Technology

    Iran

    Homepage

Ali Davoudi,

    Dr. Ali Davoudi

    Department of Electrical Engineering

    University of Texas at Arlington

    USA

    Homepage

Alireza Pouramin

    Dr. Alireza Pouramin

    Department of Electrical and Computer Engineering

    Isfahan University of Technology

    Iran

    Homepage

Progress In Electromagnetics Research B, Vol. 60, 95-110, 2014
doi:10.2528/PIERB14051704 | Google Scholar

Abstract
Geometrical modeling of induction machines under eccentricity conditions involves a significant number of self and mutual inductances. These inductances are functions of rotor angular position, and calculating them at each time step requires solving computationally-intensive definite integrals. Conventional techniques use numerical look-up tables, or employ approximated analytical expressions such as limited-term Fourier series expression of turn functions. The former approach needs large memory volume given the size of inductance matrix. Moreover, numerical interpolations are needed upon model execution, which significantly slows down the simulation. The later technique is computationally tasking for a large set of Fourier series terms, or lacks sufficient accuracy if only a few terms are used. Alternatively, computationally efficient closed-form solutions for self- and mutual- inductance expressions are presented here. The step variations of turn functions are considered which streamlines the model formulation. The experimental results validate the proposed model. In particular, the frequency spectrum of the stator current illustrates the ability of proposed technique to detect eccentricity.
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Citation
Hossein Hooshmandi Safa, Mohammad Ebrahimi, Ali Davoudi, and Alireza Pouramin, "Analytical Derivation of Induction Motors Inductances Under Eccentricity Conditions," Progress In Electromagnetics Research B, Vol. 60, 95-110, 2014.
doi:10.2528/PIERB14051704
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