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On the Measurement and Modelling of the Heat Transfer Coefficient of a Hollow-Shaft Rotary Cooling System for a Traction Motor

Lookup NU author(s): Yaohui Gai, Dr Kia Kimiabeigi, Dr James Widmer, Dr Andrew Steven



This is the authors' accepted manuscript of an article that has been published in its final definitive form by IEEE, 2018.

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


IEEE This paper addresses the heat transfer coefficient (HTC) associated with the hollow-shaft rotor cooling of a traction motor. In such a hollow-shaft cooling system, the coolant is made to flow through the shaft hole in order to cool the rotor. The HTC is estimated using computational fluid dynamics (CFD), where the effect of rotational velocity as well as the coolant flow rate have been accounted for. Experiments are then used to validate the accuracy of CFD models with the assistance of an analytical lumped-parameter thermal network (LPTN) approach. On the basis of CFD simulations and the experimental prototype testing, it is concluded that the rotational speed can significantly increase the convective heat transfer of the shaft hole about 3.8 times at 4500 rpm above the level of the stationary condition. As a result of such analysis, a new dimensionless correlation of the Nusselt number with the Reynolds number is derived.

Publication metadata

Author(s): Gai Y, Kimiabeigi M, Chong YC, Widmer J, Goss J, Sanandres U, Steven A, Staton DA

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2018

Volume: 65

Issue: 6

Pages: 4475-4482

Print publication date: 01/06/2018

Online publication date: 27/07/2018

Acceptance date: 02/04/2018

Date deposited: 12/09/2018

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: IEEE


DOI: 10.1109/TIA.2018.2860558


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