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Magnet Losses and Demagnetisation in a Permanent Magnet In-wheel Electric Vehicle Traction Motor

Lookup NU author(s): Sichao Yang, Dr Nick BakerORCiD, Professor Barrie Mecrow, Daniel Smith, Dr Glynn Atkinson



This is the authors' accepted manuscript of a conference proceedings (inc. abstract) that has been published in its final definitive form by IEEE, 2015.

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


This paper investigates magnet topologies and their susceptibility to demagnetisation in an in-wheel motor for an electric vehicle. The analysed motor is a high torque density, low speed, surface-mounted permanent magnet (SMPM) modular motor with fractional slot concentrated winding (FSCW) and an outer rotor. The rich spatial stator MMF harmonics present in the air gap have two effects: they generate AC losses in the magnets and they can increase the peak demagnetising field which the magnets experience. In this work, methods are first developed to give greater insight into the magnet loss mechanisms, thereby indicating when magnet segmentation is beneficial. The methods are then extended to examine how different rotor designs are affected by both loss and demagnetisation fields, showing major differences between rotor topologies.[1]

Publication metadata

Author(s): Yang S, Baker NJ, Mecrow BC, Smith D, Atkinson G, Hilton C, Perovic DK, Kakavas I, Sooriyakumar G, Harvey P

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

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

Year of Conference: 2015

Pages: 1831-1837

Online publication date: 18/02/2016

Acceptance date: 16/04/2015

Date deposited: 13/05/2016

Publisher: IEEE


DOI: 10.1109/IEMDC.2015.7409313

Library holdings: Search Newcastle University Library for this item

ISBN: 9781479979417