Hua, H., Zhu, Z.Q. orcid.org/0000-0001-7175-3307, Pride, A. et al. (2 more authors) (2017) A Novel Variable Flux Memory Machine With Series Hybrid Magnets. IEEE Transactions on Industry Applications, 53 (5). pp. 4396-4405. ISSN 0093-9994
Abstract
This paper proposes a novel variable flux memory (VFM) machine, in which the “constant” permanent magnet (CPM) with high coercive force and the “variable” PM (VPM) with low coercive force are alternatively located in the interior-PM rotor. Thus, the VPMs and CPMs are magnetically connected in series, with which the CPMs can assist the VPMs to withstand the unintentional demagnetization caused by armature reaction. Therefore, a high armature current can be applied to the machine. Meanwhile, the reluctance torque is retrieved. Thus, a high torque density can be obtained. Based on two-dimensional finite element analysis, first, the electromagnetic performance of the proposed VFM machine in two extreme magnetization states is evaluated in detail. Then, the demagnetization and remagnetization characteristics are investigated, in which the working points of VPMs are illustrated. Furthermore, the advantages of improved efficiency of the proposed VFM machine are demonstrated. A prototype machine is manufactured and tested to validate the predictions.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2017 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works. Reproduced in accordance with the publisher's self-archiving policy. |
Keywords: | Torque; Magnetization; Rotors; Magnetic flux; Demagnetization; Stator windings; demagnetisation; finite element analysis; permanent magnet motors; extreme magnetization states; 2D finite element analysis; reluctance torque; armature reaction; unintentional demagnetization; VPM; interior-PM rotor; coercive force; CPM; constant permanent magnet; VFM machine; series hybrid magnets; variable flux memory machine; Efficiency; memory machine; permanent magnet (PM); series connection; torque; variable flux |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 16 May 2019 14:28 |
Last Modified: | 17 May 2019 22:30 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Refereed: | Yes |
Identification Number: | 10.1109/TIA.2017.2709261 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:146197 |