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Shaft cooling and the influence on the electromagnetic performance of traction motors

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



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2017.

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


This paper addresses the heat transfer coefficient associated with a shaft-cooling of traction motors. In such shaft-cooling systems, the 50-50 ethylene glycol-water is made to flow through the shaft hole in order to cool the machine. The heat transfer coefficient is estimated using a CFD (computational fluid dynamics) method, where the effect of rotational velocity as well as liquid flow rate have been accounted for. The results from two different turbulence models were compared. As a result of the simulations, it is concluded that the rotational speed can significantly increase the convective heat transfer in the shaft hole above the stationary condition. Finally, the benefits of implementing a shaft-cooling to an existing ferrite magnet traction motor, in terms of continuous torque capability, is described.

Publication metadata

Author(s): Gai Y, Kimiabeigi M, Widmer J, Chong Y, Goss J, SanAndres U, Staton D

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: IEEE International Electric Machines and Drives Conference (IEMDC 2017)

Year of Conference: 2017

Online publication date: 08/08/2017

Acceptance date: 15/03/2017

Date deposited: 21/08/2017

Publisher: IEEE


DOI: 10.1109/IEMDC.2017.8002307