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Reduction of Cogging Torque and EMF Harmonics in Modulated Pole Machines

Lookup NU author(s): Dr Jamie Washington, Dr Glynn Atkinson, Dr Nick BakerORCiD



This paper discusses a method for reducing cogging torque and harmonic content of back-electromotive force (EMF) waveforms in modulated pole machines (MPMs). Tooth pitching is applied to a separate phase MPM in order to reduce the most prominent harmonics present in a three-phase MPM's cogging torque. Experimental results show that the application of tooth pitching to these machines can reduce the cogging torque and back-EMF harmonics significantly. This comes without a significant impact to the useful output of the machine, which is confirmed by the comparison of measured results for two prototypes. Such a technique can be easily applied to existing machine designs without the need for extra components and for the same production cost.

Publication metadata

Author(s): Washington JG, Atkinson GJ, Baker NJ

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Energy Conversion

Year: 2016

Volume: 31

Issue: 2

Pages: 759-768

Print publication date: 01/06/2016

Online publication date: 19/02/2016

Acceptance date: 14/01/2016

Date deposited: 08/03/2016

ISSN (print): 0885-8969

ISSN (electronic): 1558-0059

Publisher: IEEE


DOI: 10.1109/TEC.2016.2520200


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