Evaluation of Impregnation Materials for Thermal Management of Liquid-Cooled Electric Machines
2014 (English)In: IEEE transactions on industrial electronics (1982. Print), ISSN 0278-0046, Vol. 61, no 11, 5956-5965 p.Article in journal (Refereed) Published
In this paper, the thermal impact of using different impregnation materials on high-performance liquid-cooled electric machines is studied. In this regard, varnish, Epoxylite, and a silicone-based thermally conductive material are considered. To study thermal effects of using different impregnation materials in theory, an advanced lumped-parameter thermal model of the studied electric machines is developed. In addition to the simulation studies, three identical induction machines using the aforementioned materials are manufactured and evaluated. Experimental tests are carried out at a wide range of current magnitudes and cooling conditions. A good agreement between the temperature measurements and corresponding simulation results is observed. It is demonstrated that using innovative thermally conductive materials in the stator slots and the end winding bodies of liquid-cooled electric machines results in a significant reduction in the winding hot spot temperature. Additionally, the influence of the critical parameters on the impregnation material performance, e. g., impregnation goodness and slot fill factor, is studied.
Place, publisher, year, edition, pages
2014. Vol. 61, no 11, 5956-5965 p.
Computational fluid dynamics, direct oil cooling, Epoxylite, hybrid electric vehicle (HEV), impregnation material, induction machines, lumped parameter (LP) thermal model, silicone-based thermally conductive material (SbTCM), vacuum impregnation, varnish
Control Engineering Other Electrical Engineering, Electronic Engineering, Information Engineering
IdentifiersURN: urn:nbn:se:kth:diva-122841DOI: 10.1109/TIE.2014.2308151ISI: 000337123000016ScopusID: 2-s2.0-84902340101OAI: oai:DiVA.org:kth-122841DiVA: diva2:623561
FunderStandUpSwedish Energy Agency
Updated from Submitted to Published. QC 201407152013-05-282013-05-282014-07-15Bibliographically approved