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Modelling and analysis of electromagnetic torque in direct drive PM machines with rotor eccentricity

Lookup NU author(s): Dr Kia Kimiabeigi



This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND).


The influence of rotor eccentricity on torque oscillations as well as average output torque of permanent magnet (PM) machines with integral number of slots per pole per phase has been studied using 1-dimensional (1D) analytical modelling and 2-dimensional (2D) finite element (FE) method. It is shown that cogging and ripple torque are amplified by rotor eccentricity due to the contribution of new flux density components created by eccentricity, while this amplification follows a quadrature function against the eccentricity degree. Furthermore, it is shown that the average electromagnetic torque can be increased by rotor eccentricity provided that magnetic saturation is negligible. The analytical predictions have been validated by FE analysis of a direct drive PM machine.

Publication metadata

Author(s): Kimiabeigi M, Zhu Q

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: 6th IET International Conference on Power Electronics, Machines and Drives (PEMD 2012)

Year of Conference: 2012

Date deposited: 04/08/2016

Publisher: IET


DOI: 10.1049/cp.2012.0278