Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/163225
Title: Thermally conductive polymer composites for thermal management of electric machines: a modeling and experimental study
Authors: Chen, Xuelong
Yan, Weili
Mathivanan, Muthukumar
Chen, Hui
Lambourne, Alexis
Gill, Vincent
Hu, Xiao
Keywords: Engineering::Materials
Issue Date: 2022
Source: Chen, X., Yan, W., Mathivanan, M., Chen, H., Lambourne, A., Gill, V. & Hu, X. (2022). Thermally conductive polymer composites for thermal management of electric machines: a modeling and experimental study. Materials Today Communications, 32, 104018-. https://dx.doi.org/10.1016/j.mtcomm.2022.104018
Journal: Materials Today Communications 
Abstract: With ever-increasing drive to improve the power output of electric machines and reduce heat accumulation based insulation failure, efficient thermal management is highly desirable. Increasing thermal conductivity of impregnation resin is critically important for thermal dissipation in electric machines. In this work, we investigated how the improvement in thermal conductivity of impregnation resins could benefit the heat dissipation of electric machines. To this end, a two-dimensional (2D) finite element analysis (FEA) was conducted, which revealed that increasing the thermal conductivity of impregnation resins to 0.6–0.8 W·m−1·K−1 could significantly decrease the winding temperature. Meanwhile, epoxy-based composites with different thermally conductive fillers were synthesized. The effect of filler type/loading on thermal conductivity and viscosity were investigated. After systematically measuring the thermal conductivity and viscoelastic properties of these composites, a “viscosity-thermal conductivity” correlation was plotted to sort out candidate resin for impregnation trials. In addition, impregnated prototypes comprising enamel wires and both neat epoxy resin and thermally conductive composite impregnation resins were fabricated. Under both natural and forced convection, the epoxy/BN composite resin was shown to be effective in reducing the core temperature of prototype by 9.1–18.6 °C compared with neat epoxy-impregnated prototype. The results indicated that thermally conductive polymer composites had the potential to greatly improve thermal management of electric machines. The findings in this work provide insights and guidelines for future development of thermally conductive impregnation resins.
URI: https://hdl.handle.net/10356/163225
ISSN: 2352-4928
DOI: 10.1016/j.mtcomm.2022.104018
Schools: School of Materials Science and Engineering 
Research Centres: Rolls-Royce@NTU Corporate Lab 
Temasek Laboratories @ NTU 
Nanyang Environment and Water Research Institute 
Rights: © 2022 Elsevier Ltd. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:MSE Journal Articles
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