Analysis of rotor bar number on induction motor performance characteristics and rotor temperature

Yaser Mahmoudian; Hamid Reza Izadfar; Asghar Akbari Froud

doi:10.32397/tesea.vol7.n1.759

Authors

Yaser Mahmoudian Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran https://orcid.org/0009-0005-4559-2585
Hamid Reza Izadfar Semnan University https://orcid.org/0000-0002-9685-0389
Asghar Akbari Froud Faculty of Electrical and Computer Engineering, Semnan University, Semnan, Iran https://orcid.org/0000-0001-6902-8990

DOI:

https://doi.org/10.32397/tesea.vol7.n1.759

Keywords:

induction motor, rotor bar number, rotor temperature

Abstract

This paper investigates the influence of rotor bar number on the thermal and electromagnetic performance of induction motors using a combined FEM--thermal modeling framework. A systematic analysis covering 8--26 rotor bars was conducted under both constant voltage and constant current conditions. Results show that rotor temperature and torque ripple are strongly dependent on bar count. A multi-objective optimization function is proposed to determine the optimal bar number by balancing efficiency and temperature rise. The novelty of this work lies in integrating thermal constraints into rotor bar selection, providing practical guidance for designers. Validation was performed using Motor-CAD and an extended lumped parameter model, demonstrating good agreement.

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