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The analytic-field method for calculating the squirrel-cage induction motor parameters

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Category: Contens №3 2020

Last Updated on 13 September 2020

Published on 02 July 2020

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Authors:

V. Finkelshtein, Dr. Sc. (Tech.), Prof., Professor of the Department of Power Supply and Power Consumption of Cities, orcid.org/0000-0002-8016-9214, O. M. Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. Iegorov, Cand. Sc. (Tech.), Assoc. Prof., Assistant Professor of the Department of Alternative Electricity and Electrical Engineering, orcid.org/0000-0003-2599-1624, O. M. Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. Petrenko, Dr. Sc. (Tech.), Prof., Assistant Professor of the Department of Electric Transport, orcid.org/0000-0003-4027-4818, O. M. Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

O. Koliada, Cand. Sc. (Tech.), Assoc. Prof., Assistant Professor of the Department of Power Supply and Power Consumption of Cities, orcid.org/0000-0003-3925-0499, O. M. Beketov National University of Urban Economy in Kharkiv, Kharkiv, Ukraine, e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.

Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu. 2020, (3): 67-72

https://doi.org/10.33271/nvngu/2020-3/067

повний текст / full article

Abstract:

Purpose. In the existing methods for calculating induction motors, such parameters as the coefficient of flattening of the of the air-gap field curve, the differential scattering coefficient and the saturated values of the inductive scattering resistances are calculated according to empirical formulas, the calculated values of which differ significantly from the experimental ones. The aim of the article is to develop methods (based on field calculations) which take into account eccentricity, saturation, and higher harmonics and is necessary when designing asynchronous motors.

Methodology. By expanding the Fourier series of the magnetic induction distribution curve in the air gap of a saturated squirrel-cage induction motor obtained by calculating the field by the finite element method, higher harmonics are determined taking into account the saturation and the rotor axis eccentricity relative to the stator axis and the exact values of inductive resistances.

Findings. A technique has been developed that increases the accuracy of the calculation of an induction motor, which eliminates errors from empirical formulas and takes into account eccentricity, saturated values of differential and groove scattering, saturation harmonics, and a flattening of the field curve in the gap, and ultimately improves the energy performance of induction motors.

Originality. The proposed technique for improving the calculation of induction motors in starting conditions allows determining the values of starting currents and torques on the motor shaft, which differ from the experimental ones by no more than the measurement error. The research results create the prerequisites for the development of an improved methodology for calculating an induction motor in all modes of its operation, which will allow us to design highly efficient motors that meet world requirements.

Practical value. Application of the proposed methodology for calculating the parameters of induction motors can increase the efficiency of electromagnetic calculations, reduce design errors, and reduce additional costs in the manufacture of prototypes.

References.

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