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.
Author(s): Ullah S, McDonald S, Martin R, Benarous M, Atkinson GJ
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Industry Applications
Print publication date: 01/01/2019
Online publication date: 10/08/2018
Acceptance date: 13/07/2018
ISSN (print): 0093-9994
ISSN (electronic): 1939-9367
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