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A Permanent Magnet Assist, Segmented Rotor, Switched Reluctance Drive for Fault Tolerant Aerospace Applications

Lookup NU author(s): Sana Ullah, Dr Stephen McDonald, Dr Richard Martin, Dr Glynn Atkinson



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.


-- This paper presents the design, analysis, prototype and testing of a new fault tolerant electrical machine topology. The segmented rotor switched reluctance machine (S-SRM) has been modified to include permanent magnet assist by placing magnets in the stator slot opening. This introduces a magnetic bias which extends the magnetic operating region of the machine and results in greater torque when compared to the conventional fault tolerant segmental rotor switched reluctance machine. The new topology was investigated using 2D and 3DFE methods and a prototype machine built, tested and verified against the simulations. Experimental testing was carried out with and without the magnets to assess the effect of the PM assist on torque performance. Static tests were carried out to obtain the torque - flux linkage - angle waveforms and then this information used to tune a bespoke drive and test the system under dynamic conditions. The tests show that this new topology not only meets the requirements of a competing permanent magnet synchronous machine, but also, with the magnets removed from the rotor, rotational induced EMFs are eliminated as are the associated short circuit currents during a fault. Hence the fault tolerance of this machine is greatly improved. Such a fault tolerant feature will be of great benefit to fault critical systems such as aerospace drives and actuators.

Publication metadata

Author(s): Ullah S, McDonald S, Martin R, Benarous M, Atkinson GJ

Publication type: Article

Publication status: Published

Journal: IEEE Transactions on Industry Applications

Year: 2018

Volume: 55

Issue: 1

Pages: 298-305

Print publication date: 01/01/2019

Online publication date: 10/08/2018

Acceptance date: 13/07/2018

Date deposited: 07/08/2018

ISSN (print): 0093-9994

ISSN (electronic): 1939-9367

Publisher: IEEE


DOI: 10.1109/TIA.2018.2864718


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