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Energies 2018, 11(8), 2024; https://doi.org/10.3390/en11082024

Coupled Fluid-Thermal Analysis for Induction Motors with Broken Bars Operating under the Rated Load

School of Electrical & Electronic Engineering, Harbin University of Science and Technology, Harbin 150080, China
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Received: 3 July 2018 / Revised: 19 July 2018 / Accepted: 25 July 2018 / Published: 3 August 2018
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Abstract

Thermal stress of the rotor in a squirrel cage induction motor is generated due to the temperature rise, it is also one of the factors causing the broken bar fault because the structure of the rotor would be destroyed if the stress of the rotor bars exceed the strength limit. The coupled fluid-thermal analysis for the induction motor with healthy and broken bar rotors is performed in this paper. Much concern has been committed to establishment of the fluid model on the basis of computational fluid dynamic (CFD) theory. The heat field of the prototypes is analysed so that the effect of the asymmetrical rotor on the motor heat performance can be investigated in depth. Eventually, the efficiency of the presented model and method, for the totally enclosed fan cooled (TEFC) induction motor, can be verified through experimental results. In addition, this paper reports a quantitative analysis of the heat flux distribution of the fault rotor, and the heat flux density of the bars is investigated in detail. Then, the part most likely to break in the rotor as a result of the thermal load is identified. View Full-Text
Keywords: induction motors; finite element method; computational fluid dynamic (CFD) method; thermal field; fluid field; broken bars fault induction motors; finite element method; computational fluid dynamic (CFD) method; thermal field; fluid field; broken bars fault
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Xie, Y.; Guo, J.; Chen, P.; Li, Z. Coupled Fluid-Thermal Analysis for Induction Motors with Broken Bars Operating under the Rated Load. Energies 2018, 11, 2024.

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