| Author: | Mao, Yuan |
| Title: | Developments and analysis of multiport flux-modulation machines |
| Advisors: | Niu, S (EE) |
| Degree: | Ph.D. |
| Year: | 2021 |
| Subject: | Modulation (Electronics) Spintronics Electric machinery -- Power supply Hong Kong Polytechnic University -- Dissertations |
| Department: | Department of Electrical Engineering |
| Pages: | viii, 130 pages : color illustrations |
| Language: | English |
| Abstract: | The growing emission of greenhouse gases has become a looming crisis in this era. Greenhouse gas is mainly generated from heavy industry and automobile exhaust, etc. Once the greenhouse gas exceeds the atmospheric standard, the global temperature will rise and the health of human beings will be threatened. To reduce the environmental problems caused by greenhouse gas emissions, new energy applications have been developed. Among them, electric vehicles (EVs), which directly use electric energy instead of gasoline to drive can effectively reduce exhaust gas emissions. The vigorous development of EVs has prompted the novel design of electric machines for effective propulsion. Multiport flux-modulation machine is one of the most promising types of newly designed electric machines. Flux-modulation machines operate based on the flux-modulation effect, where the excitation field and the armature field interact over their harmonic components. Compared with traditional machines, multiport machines have more than one electrical port or mechanical port. Multiple electric ports may contribute to the merits of diversified approaches of flux control, the capability of fault-tolerance operation, and compound power-split modes. Multiple mechanical ports can bring the advantages of increasing the motion modes, enhancing the manners of kinetic energy transmission, and more possibility to integrate machines and gears. In this thesis, the design, analysis, optimization, and parameter identification of multiport flux-modulation machines are introduced. The thesis mainly includes the following contents. a) A literature review on the development of different types of multiport flux-modulation machines is presented. According to topology evolution, multiport flux-modulation machines can be further categorized into basic flux-modulation machines, variable flux flux-modulation machines, and compound flux-modulation machines. b) A newly designed multiport flux-modulation machine, i.e. the hybrid-excited biased-flux machine (HEBFM) is proposed. The aim of introducing field current in HEBFM is to construct a new magnetic field pole type rather than strengthening or weakening the PM fields. The analytical model of the HEBFM is discussed, which is verified by simulation and experimental results. c) Sensitivity analysis based on the Taguchi method is suggested. By employing sensitivity analysis, the number of optimization parameters can be reduced and the scale of the parameter value range can be shrunk. d) Multi-objective optimization based on differential evolution (DE) coupled with the finite element method (FEM) is discussed in this thesis. An example of a multiport flux-modulation machine is optimized based on this method. e) Adaptive differential evolution (ADE) method-based parameter identification of the multiport flux-modulation machine is presented. |
| Rights: | All rights reserved |
| Access: | open access |
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