Fractional Slot Concentrated Windings

Design, Analysis, and Optimization
1. Auflage 2026
ISBN: 978-1-394-42392-7
Verlag: John Wiley & Sons Inc

Buch, Englisch, 304 Seiten

A consolidation of all known FSCW types and their optimization methods

Fractional Slot Concentrated Windings provides an in-depth analysis of fractional slot concentrated windings (FSCWs), reviewing theoretical foundations and existing FSCWs including three-phase and multiphase windings and their optimization methods, benefits, challenges, and solutions. Numerous winding topologies for real-world applications in traction motors, aerospace systems, robotics, industrial drives, and renewable energy systems are also included.

This book delves into detailed examinations of distinct winding groups and explores optimization techniques with dedicated chapters on specialized coil configurations. For each FSCW group, the main winding topologies and their associated winding layouts are explained.

Written by a highly qualified author in the field, this book includes information on: - Analytical approaches for the calculations of MMF characteristics and their winding factors
- A specific FSCW configuration with unequal zones and asymmetric zone distributions, expanding the spectrum of standard concentrated winding topologies
- Unique winding structures, such as the two-tooth coil-pitch design, alongside a review of star-delta combination concepts for FSCWs
- The flux-barrier technique, including the implementation of flux barriers in both the stator yoke and stator teeth regions
- Novel winding solutions for radial-flux and axial-flux machines

Covering principles, performance, and optimization. This book serves as a comprehensive guide for engineers, researchers, and practitioners working with FSCWs in the design and optimization of modern electrical machines.

Autoren/Hrsg.

Dajaku, Gurakuq

Fachgebiete

• Technische Wissenschaften Elektronik | Nachrichtentechnik Nachrichten- und Kommunikationstechnik Regelungstechnik
• Technische Wissenschaften Energietechnik | Elektrotechnik Elektrotechnik
• Technische Wissenschaften Verfahrenstechnik | Chemieingenieurwesen | Biotechnologie Verfahrenstechnik, Chemieingenieurwesen

Inhaltsverzeichnis

About the Author xi
Preface and Acknowledgments xiii
Abbreviations and Symbols xv

1 Introduction 1
1.1 Stator Winding Types 2
1.2 Winding Realization 4
1.3 Winding Topologies 6
1.4 Fundamental Winding Specifications 7
1.5 MMF Harmonic Definition 9
1.6 Manufacturing Methods 9
1.7 Applications 10

2 Standard Fractional Slot Concentrated Windings 13
2.1 Single-coil MMF Formulation 13
2.3 Winding Factors 28
2.4 Three-phase MMF Distribution 33
2.5 MMF Characteristics of Various Three-phase Standard FSCWs 35

3 Fractional Slot Concentrated Windings with Unequal Zones 45
3.1 Winding Configurations 45
3.2 MMF Analysis 47
3.3 Winding Factors 66
3.4 MMF Characteristics of Various Three-phase FSCWs with Unequal Zones 79

4 Fractional Slot Concentrated Windings with Specific Coil Configuration 87
4.1 FSCWs with Asymmetric Coils 87
4.2 FSCWs with Unequal Turns per Coil 95
4.3 FSCWs with Unequal Coil-pitch 101
4.4 Exemplary Windings with Special Coil Configurations 104

5 Multiphase Fractional Slot Concentrated Windings 107
5.1 Multiphase FSCW Topologies 107
5.2 Multi-three-phase FSCWs 112
5.3 FSCWs with an Arbitrary Number of Phases 118
5.4 Representative Multiphase FSCWs 125

6 Fractional Slot Concentrated Windings with Flux-barrier Stator 133
6.1 Stator Flux-barrier Techniques 135
6.2 FSCWs with Stator-yoke Flux-barriers 138
6.3 FSCWs with Stator-teeth Flux-barriers 155
6.4 Multiphase SL-FSCWs with Flux-barrier Stator 165

7 Two-tooth Fractional Slot Winding 179
7.1 Implementation and Operating Principles 180
7.2 Single-layer Two-tooth/Three-phase FSWs 184
7.3 Double-layer Two-tooth/Three-phase FSWs 188
7.4 Multiphase Two-tooth FSWs 194
7.5 Two-tooth FSWs with Specific Coil Configurations 203

8 Fractional Slot Concentrated Windings with Star-delta Connection 211
8.1 Star-delta Windings 212
8.2 Star-delta FSCW Topologies 216
8.3 Winding Analysis 221
8.4 FSCWs with Sequential Star-delta Coil Arrangements 234
8.5 Star-delta FSCWs with a Dual Slot-layer Stator 242
8.6 Exemplary Star-delta FSCW Machines 244

9 Fractional Slot Concentrated Windings for Axial Flux Machines 249
9.1 AFMs – Construction and Realization 249
9.2 AFMs – Stator Winding MMF Harmonics 251
9.3 Stator-shifting Technique for AFMs with Concentrated Windings 254
9.4 AFMs with Asymmetric Stator Shifting 261
9.5 AFMs with Unequal Turns per Coil 264
9.6 AFMs with Flux-barrier Stator 264
9.7 AFMs Topologies 265

References 267
Index 275

Über Autor(innen)

GURAKUQ DAJAKU is the CEO of FEAAM GmbH, the Research Center for Electrical Drives and Actuators Munich, Germany. He received the diploma degree in electrical engineering from the University of Prishtina, Kosova, in 1997, and the PhD degree from the Universität der Bundeswehr München, Munich, Germany, in 2006. Dr. Dajaku has authored/co-authored numerous technical papers published in various IEEE conferences and journals and has several German and international patents and patent pending applications.