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About this book

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.

Table of Contents

Frontmatter

Chapter 1. Introduction

As one of the most efficient energy conversion devices that interconvert the mechanical and electrical powers, the electric machines have been employed in various industrial and domestic applications for more than one hundred years.
Christopher H. T. Lee

Chapter 2. Overview of Magnetless Doubly Salient Brushless Machines

Due to a large variety of industrial applications, including the electric vehicles (EVs), wind power generations, ship propulsion systems, and robotic applications, the development of the electric machines has been a hot research topic in the last century (Cheng et al. in IEEE Trans Ind Electr 58(11):5087–5101, 2011 [1]).
Christopher H. T. Lee

Modeling, Numerical Analysis and Experimental Verification of Torque Improving Topologies

Frontmatter

Chapter 3. Multi-tooth Machines—Design and Analysis

Because of the enhancing concerns on the energy utilization as well as the environmental protection, more attentions have been placed on the development of electric machines.
Christopher H. T. Lee

Chapter 4. Double-Rotor Machines—Design and Analysis

Because of the enhancing needs on the environmental protection and energy utilization, the development of electric vehicles (EVs) and renewable energy (RE) are speeding up in the past few decades.
Christopher H. T. Lee

Chapter 5. Development of Singly Fed Mechanical-Offset Machine for Torque Ripple Minimization

Energy crisis and environmental pollution have gained more attentions in recent years, so that the developments of renewable energy systems, such as electric vehicle (EV) or wind power generation, have become very popular (Barton and Infield in IEEE Tran Energy Convers 19(2):431–438 (2004) [1]; Emadi et al. in IEEE Trans Ind Electron 55(6):2237–2245 (2008) [2]; Santiago et al. in IEEE Trans Veh Technol 61(2): 475–484 (2012) [3]).
Christopher H. T. Lee

Design, Analysis and Application of Advanced Magnetless Machines on Wind Power Generations

Frontmatter

Chapter 6. Proposed Flux-Reversal DC-Field Machine for Wind Power Generation

Energy crisis and environmental pollution have become the worrying problems since the last few decades, while the renewable wind power generation has confirmed to be one of the most probable solutions to relieve the situations (Barton and Infield in IEEE Trans Energy Convers 19(2):431–438, 2004, Hughes et al. in IEEE Trans Power Syst 20(4):1958–1966, 2005).
Christopher H. T. Lee

Chapter 7. Proposed Dual-Mode Machine for Wind Power Harvesting

Because of the increasing concerns on the energy utilization and the environmental protection, the wind power has gained lots of attentions recently. The wind power harvesting applications generally can be classified as two big families, namely the constant-speed constant-frequency (CSCF) wind power generation and the variable-speed constant-frequency (VSCF) wind power generation. Without installation of power converters, the CSCF type takes the absolute merit of compact system architecture as well as simplicity. Yet, its operating speed has to be maintained in a limited range so that there is no correlation with the wind speed. Therefore, it suffers from the problems of lower efficiency and higher mechanical losses.
Christopher H. T. Lee

A Comprehensive Study of Advanced Magnetless Machines on Electric and Hybrid Vehicles

Frontmatter

Chapter 8. Proposed Axial-Field Machine for Range-Extended Electric Vehicles

As suggested in the previous chapters, the electric vehicle (EV) applications have attracted many attentions to cope with the energy issues. In general, the traditional EVs employ only the battery as the pure energy source so this type of EVs can only support for short duration trips and impractical practical for standard drivers. To extend the driving range for standard applications, the range-extended EV (RE-EV) that implements an internal combustion engine (ICE) as secondary energy source has become very attractive.
Christopher H. T. Lee

Chapter 9. Proposed Reliable Gearless Machine for Magnetic Differential System

Electric vehicles (EVs) have been regarded as the cleanest and greenest road transportation for smart cities (Emadi et al. IEEE Trans Ind Electron 55(6):2237–2245, 2008, Hua et al. IEEE Tran Magn 51(3):8201805, 2015).
Christopher H. T. Lee

Chapter 10. Proposed Electronic-Geared Machine for Electric Vehicle Applications

Energy utilization and environmental protection have become the hot research topics in recent years, while as one of the most promising solutions to improve the current situations, the development of the electric vehicles (EVs) is speeding up.
Christopher H. T. Lee

Chapter 11. Conclusions and Future Works

The objectives of this project have been successfully accomplished and various high-performance magnetless doubly salient brushless machines have been analyzed and developed.
Christopher H. T. Lee
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