Rudden, I., Wang, P., Li, H. et al. (4 more authors) (2024) DQ analysis of fractional-slot machines with star-delta concentrated winding. IEEE Access, 12. pp. 84680-84690. ISSN 2169-3536
Abstract
This paper presents a novel method for addressing the challenge of dq -transformation in fractional-slot machines with star-delta connected concentrated windings. These machines have no neutral point, preventing direct measurement of mutual inductance between phases. This complicates the calculation of d - and q -axis inductances, which are crucial for modern control techniques such as field-oriented and sensorless control. The proposed method derives d - and q -axis inductances as functions of individual star and delta coil inductances, which can easily be measured. Moreover, it demonstrates that the d - and q -axis inductances can be calculated using measurements from just two adjacent coils. The method begins with constructing a decomposed coil-by-coil inductance matrix, separating each phase winding into individual star and delta coil inductances. This matrix is then transformed into the dq -frame using a three-step process: firstly, summing individual flux linkages to derive line flux linkage based on circuit configuration; secondly, decomposing 3-phase abc supply currents into individual currents within the star and delta coils to address phase shift and amplitude differences; and finally, transforming line flux linkage into the dq -frame using a modified power-invariant Park transformation. The proposed method is validated by simulations and experiments on both surface mounted and interior permanent magnet machines.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2024 The author(s). This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see https://creativecommons.org/licenses/by/4.0/ |
Keywords: | dq analysis; concentrated windings; fractional-slot; star-delta connection |
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) |
Funding Information: | Funder Grant number ENGINEERING AND PHYSICAL SCIENCE RESEARCH COUNCIL EP/R004900/1 SIEMENS PUBLIC LIMITED COMPANY UNSPECIFIED |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 17 Jun 2024 11:39 |
Last Modified: | 20 Nov 2024 15:46 |
Status: | Published |
Publisher: | Institute of Electrical and Electronics Engineers (IEEE) |
Refereed: | Yes |
Identification Number: | 10.1109/ACCESS.2024.3413145 |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:213238 |
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Licence: CC-BY 4.0