X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings

Joshua Hoole; E Martin-Silverstone; Phil H Mellor; Nick Simpson

doi:10.1109/WEMDCD61816.2025.11014200

X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings

Joshua Hoole, E Martin-Silverstone, Phil H Mellor, Nick Simpson

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

Abstract

To accommodate the development of power-dense electrical machines that employ multistrand random windings, there has been sustained interest in the statistical simulation of the variable strand transpositions that occur in as-manufactured windings. However, the development and calibration of such methodologies is challenging due to the lack of data concerning realistic strand transpositions. This paper aims to overcome this lack of data through performing X-ray Computed Tomography (XCT) of a multistrand random winding coil extracted from an electric vehicle traction motor stator. By tracing each parallel strand in the winding through the XCT-derived data, turn bundle shapes and behaviours were identified that are not routinely accounted for in the statistical simulation of strand transpositions. Consequently, the data presented in this paper presents guidance to support the future development of strand transposition and AC loss variability simulation methods.

Original language	English
Title of host publication	2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)
Publisher	Institute of Electrical and Electronics Engineers (IEEE)
Number of pages	6
ISBN (Electronic)	9798331520748
ISBN (Print)	9798331520755
DOIs	https://doi.org/10.1109/WEMDCD61816.2025.11014200
Publication status	Published - 2 Jun 2025
Event	2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) - Valletta, Malta Duration: 9 Apr 2025 → 10 Jun 2025 https://www.um.edu.mt/events/wemdcd2025/

Publication series

Name	IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)
Publisher	IEEE
ISSN (Print)	2694-0264
ISSN (Electronic)	2380-856X

Conference

Conference	2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)
Country/Territory	Malta
City	Valletta
Period	9/04/25 → 10/06/25
Internet address	https://www.um.edu.mt/events/wemdcd2025/

Research Groups and Themes

Electrical Energy Management

Keywords

random windings
computed tomography
x-ray

Access to Document

10.1109/WEMDCD61816.2025.11014200

Full-text PDF (accepted manuscript)
This is the accepted author manuscript (AAM) of the article which has been made Open Access under the University of Bristol's Scholarly Works Policy. The final published version (Version of Record) can be found on the publisher's website. The copyright of any third-party content, such as images, remains with the copyright holder.
Accepted author manuscript, 1.68 MBLicence: CC BY

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Cite this

Hoole, J., Martin-Silverstone, E., Mellor, P. H., & Simpson, N. (2025). X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings. In 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) (IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)). Institute of Electrical and Electronics Engineers (IEEE). https://doi.org/10.1109/WEMDCD61816.2025.11014200

Hoole, Joshua ; Martin-Silverstone, E ; Mellor, Phil H et al. / X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings. 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD). Institute of Electrical and Electronics Engineers (IEEE), 2025. (IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)).

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title = "X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings",

abstract = "To accommodate the development of power-dense electrical machines that employ multistrand random windings, there has been sustained interest in the statistical simulation of the variable strand transpositions that occur in as-manufactured windings. However, the development and calibration of such methodologies is challenging due to the lack of data concerning realistic strand transpositions. This paper aims to overcome this lack of data through performing X-ray Computed Tomography (XCT) of a multistrand random winding coil extracted from an electric vehicle traction motor stator. By tracing each parallel strand in the winding through the XCT-derived data, turn bundle shapes and behaviours were identified that are not routinely accounted for in the statistical simulation of strand transpositions. Consequently, the data presented in this paper presents guidance to support the future development of strand transposition and AC loss variability simulation methods.",

keywords = "random windings, computed tomography, x-ray",

author = "Joshua Hoole and E Martin-Silverstone and Mellor, {Phil H} and Nick Simpson",

year = "2025",

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doi = "10.1109/WEMDCD61816.2025.11014200",

language = "English",

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publisher = "Institute of Electrical and Electronics Engineers (IEEE)",

booktitle = "2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)",

address = "United States",

note = "2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD) ; Conference date: 09-04-2025 Through 10-06-2025",

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Hoole, J , Martin-Silverstone, E , Mellor, PH & Simpson, N 2025, X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings. in 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD). IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD), Institute of Electrical and Electronics Engineers (IEEE), 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD), Valletta, Malta, 9/04/25. https://doi.org/10.1109/WEMDCD61816.2025.11014200

X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings. / Hoole, Joshua ; Martin-Silverstone, E ; Mellor, Phil H et al.
2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD). Institute of Electrical and Electronics Engineers (IEEE), 2025. (IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)).

Research output: Chapter in Book/Report/Conference proceeding › Conference Contribution (Conference Proceeding)

TY - GEN

T1 - X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings

AU - Hoole, Joshua

AU - Martin-Silverstone, E

AU - Mellor, Phil H

AU - Simpson, Nick

PY - 2025/6/2

Y1 - 2025/6/2

N2 - To accommodate the development of power-dense electrical machines that employ multistrand random windings, there has been sustained interest in the statistical simulation of the variable strand transpositions that occur in as-manufactured windings. However, the development and calibration of such methodologies is challenging due to the lack of data concerning realistic strand transpositions. This paper aims to overcome this lack of data through performing X-ray Computed Tomography (XCT) of a multistrand random winding coil extracted from an electric vehicle traction motor stator. By tracing each parallel strand in the winding through the XCT-derived data, turn bundle shapes and behaviours were identified that are not routinely accounted for in the statistical simulation of strand transpositions. Consequently, the data presented in this paper presents guidance to support the future development of strand transposition and AC loss variability simulation methods.

AB - To accommodate the development of power-dense electrical machines that employ multistrand random windings, there has been sustained interest in the statistical simulation of the variable strand transpositions that occur in as-manufactured windings. However, the development and calibration of such methodologies is challenging due to the lack of data concerning realistic strand transpositions. This paper aims to overcome this lack of data through performing X-ray Computed Tomography (XCT) of a multistrand random winding coil extracted from an electric vehicle traction motor stator. By tracing each parallel strand in the winding through the XCT-derived data, turn bundle shapes and behaviours were identified that are not routinely accounted for in the statistical simulation of strand transpositions. Consequently, the data presented in this paper presents guidance to support the future development of strand transposition and AC loss variability simulation methods.

KW - random windings

KW - computed tomography

KW - x-ray

UR - https://www.um.edu.mt/events/wemdcd2025/

U2 - 10.1109/WEMDCD61816.2025.11014200

DO - 10.1109/WEMDCD61816.2025.11014200

M3 - Conference Contribution (Conference Proceeding)

SN - 9798331520755

T3 - IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

BT - 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

PB - Institute of Electrical and Electronics Engineers (IEEE)

T2 - 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)

Y2 - 9 April 2025 through 10 June 2025

ER -

Hoole J , Martin-Silverstone E , Mellor PH , Simpson N. X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings. In 2025 IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD). Institute of Electrical and Electronics Engineers (IEEE). 2025. (IEEE Workshop on Electrical Machines Design, Control and Diagnosis (WEMDCD)). doi: 10.1109/WEMDCD61816.2025.11014200

X-Ray Computed Tomography Derived Turn Bundle Shapes and Transposition in Volume Manufactured Multistrand Random Windings

Abstract

Publication series

Conference

Research Groups and Themes

Keywords

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