Advanced Theory of Fractional-Slot Concentrated-Wound Permanent Magnet Synchronous Machines

This book focuses on the analytical modeling of fractional-slot concentrated-wound (FSCW) interior permanent magnet (IPM) machines and establishes a basis for their magnetic and electrical analysis. Aiming at the precise modeling of FSCW IPM machines’ magnetic and electrical characteristics, it presents a comprehensive mathematical treatment of the stator magneto-motive force (MMF), the IPM rotor non-homogeneous magnetic saturation, and its airgap flux density. The FSCW stator spatial MMF harmonics are analytically formulated, providing a basis on which a novel heuristic algorithm is then proposed for the design of optimal winding layouts for multiphase FSCW stators with different slot/pole combinations. In turn, the proposed mathematical models for the FSCW stator and the IPM rotor are combined to derive detailed mathematical expressions of its operational inductances, electromagnetic torque, torque ripple and their respective subcomponents, as a function of the machine geometry and design parameters. Lastly, the proposed theories and analytical models are validated using finite element analysis and experimental tests on a prototype FSCW IPM machine.

Introduction and Literature Review.- Analytical Modelling of Stator Magnetic Characteristics in Fractional-Slot Concentrated-Wound Permanent Magnet Machines.- Design of Optimal Winding Layouts for Multiphase Fractional-Slot Concentrated-Wound Permanent Magnet Machines.- Analytical Modelling of Rotor Magnetic Characteristics in an Interior Permanent Magnet Rotor.- Calculation of Airgap Function and Inductance in Fractional-Slot Concentrated-Wound Interior Permanent Magnet Machines.- Detailed Analytical Modelling of Electromagnetic Torque in Fractional-Slot Concentrated-Wound Interior Permanent Magnet Machines under Healthy and Open-Phase Fault Conditions.- An Extended dq Model for Fractional-Slot Concentrated-Wound Interior Permanent Magnet Machines Considering Non-Ideal Machine Parameters.- Conclusions and Future Works.

Mohammad specialises in the design and electromagnetic analysis of multiphase electrical machines. He is currently a postdoctoral researcher with the Energy Systems Research Group at the University of New South Wales, Sydney, Australia. His main interests include multiphase PM machines, electromagnetics, fault tolerant drive systems, and renewable energy.