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Thermal Analysis of an Oil-Cooled Shaft for a 30 000 r/min Automotive Traction Motor

Lookup NU author(s): Dr Xu DengORCiD



This is the authors' accepted manuscript of an article that has been published in its final definitive form by Institute of Electrical and Electronics Engineers Inc., 2020.

For re-use rights please refer to the publisher's terms and conditions.


© 1972-2012 IEEE.This article investigates an oil-based shaft cooling system as applied to a 30 000 r/min automotive traction motor. First, iron and air friction losses are identified over a range of operating speeds. Analytical and numerical approaches are then proposed to estimate the thermal performance of steady and dynamic states, respectively. Finally, experiments are conducted to evaluate the impact characteristics of this cooling system, such as the rotational speed, the inlet coolant velocity, and the amount of heat loss. Based on simulation and testing of prototype, the shaft rotational velocity can significantly enhance the heat exchange between coolant and internal surface of the hollow-shaft, across whole length of the shaft. However, when the rotational velocity reaches 30 000 r/min, the effect of the high rotational velocities on heat exchange weakens due to the flow becoming saturated.

Publication metadata

Author(s): Gai Y, Chong YC, Adam H, Deng X, Popescu M, Goss J

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2020

Volume: 56

Issue: 6

Pages: 6053-6061

Online publication date: 22/09/2020

Acceptance date: 02/04/2016

Date deposited: 09/12/2020

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: Institute of Electrical and Electronics Engineers Inc.


DOI: 10.1109/TIA.2020.3025745


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