Design, Analysis and Application of Magnetless Doubly Salient Machines

Description

This thesis investigates the key characteristics of magnetless doubly salient machines, evaluates their design philosophies, and proposes new topologies for various applications. It discusses the background of and previous research on magnetless machines, while also outlining upcoming trends and potential future developments. The thesis begins by presenting various torque-improving structures – namely the multi-tooth structure, the double-rotor (DR) structure, the axial-field (AF) structure, and the flux-reversal (FR) structure – for magnetless machines. It subsequently addresses the idea of merging the design philosophies of two different machines to form new dual-mode machines. Thanks to a reconfigured winding arrangement and controllable DC-field excitation, the proposed machines can further extend their operating range to meet the extreme demands of applications in electric vehicles and wind power generation. Lastly, the thesis employs the finite element method (FEM) to thoroughly analyze the proposed machines’ key performance parameters and develops experimental setups to verify the proposed concepts. Front Matter ....Pages i-xxx Introduction (Christopher H. T. Lee)....Pages 1-5 Overview of Magnetless Doubly Salient Brushless Machines (Christopher H. T. Lee)....Pages 7-25 Front Matter ....Pages 27-27 Multi-tooth Machines—Design and Analysis (Christopher H. T. Lee)....Pages 29-44 Double-Rotor Machines—Design and Analysis (Christopher H. T. Lee)....Pages 45-63 Development of Singly Fed Mechanical-Offset Machine for Torque Ripple Minimization (Christopher H. T. Lee)....Pages 65-87 Front Matter ....Pages 89-89 Proposed Flux-Reversal DC-Field Machine for Wind Power Generation (Christopher H. T. Lee)....Pages 91-109 Proposed Dual-Mode Machine for Wind Power Harvesting (Christopher H. T. Lee)....Pages 111-129 Front Matter ....Pages 131-131 Proposed Axial-Field Machine for Range-Extended Electric Vehicles (Christopher H. T. Lee)....Pages 133-151 Proposed Reliable Gearless Machine for Magnetic Differential System (Christopher H. T. Lee)....Pages 153-172 Proposed Electronic-Geared Machine for Electric Vehicle Applications (Christopher H. T. Lee)....Pages 173-196 Conclusions and Future Works (Christopher H. T. Lee)....Pages 197-199