Comparison of Thermal Management Approaches for Integrated Traction Drives in Electric Vehicles

Bidzina Kekelia, J. Cousineau, Kevin Bennion, Sreekant Narumanchi, Shajjad Chowdhury

Research output: Contribution to conferencePaperpeer-review


The continuous push to increase power densities of electric vehicle (EV) traction drive systems necessitates combining electric motor and power electronics into one unit. A single, compact traction drive unit with fewer interconnecting components also facilitates fast, automated assembly of electric vehicles, driving production costs down and enabling wider adoption of EVs. There are a number of challenges associated with the integration of power electronics with the electric machine, including thermal management of the combined traction drive system. However, one important benefit of integration from the thermal management system perspective is the potential for using a single fluid loop instead of two separate cooling systems for the electric machine and the power electronics/inverter. This paper reviews several integration approaches and, employing finite element analysis (FEA), compares thermal management solutions for the combined electric machine and power electronics systems. Namely, three different scenarios are modeled: (1) independent component (motor and power electronics) cooling, which is compared to the combined cooling system approach for (2) radially and (3) axially integrated power electronics modules into the motor enclosure. Temperature distributions for selected thermal loads and thermal resistances from the key heat-generating components to the cooling fluid are compared for each scenario.


ConferenceASME 2020 International Technical Conference and Exhibition on Packaging and Integration of Electronic and Photonic Microsystems, InterPACK 2020
CityVirtual, Online

Bibliographical note

See NREL/CP-5400-77160 for preprint

NREL Publication Number

  • NREL/CP-5400-78828


  • electric motor cooling
  • electric vehicle thermal management
  • power electronics cooling
  • thermal modeling
  • traction drive cooling


Dive into the research topics of 'Comparison of Thermal Management Approaches for Integrated Traction Drives in Electric Vehicles'. Together they form a unique fingerprint.

Cite this