Design and analysis of synchronous machine based on finite element method

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Design and analysis of synchronous machine based on finite element method

 

Author: Duan, Yitong
Title: Design and analysis of synchronous machine based on finite element method
Degree: M.Sc.
Year: 2016
Subject: Electromechanical devices -- Design and construction.
Electric motors, Synchronous.
Permanent magnet motors -- Design and construction.
Hong Kong Polytechnic University -- Dissertations
Department: Faculty of Engineering
Pages: 79 pages : color illustrations
Language: English
InnoPac Record: http://library.polyu.edu.hk/record=b2894571
URI: http://theses.lib.polyu.edu.hk/handle/200/8512
Abstract: Based on the briefly introduction of the structure and principle of permanent magnet synchronous motors (PMSMs), the relationships of the major structure and electromagnetic parameters have been investigated using finite-element techniques. Throughout optimization algorithms to optimize design parameters, the best structures with corresponding highest performances can be pursued. With the development of high-performance magnet (PM) materials, PMSMs have been widely used in industrial fields. The key problem of design high performance PM motors is to determine optimized structure sizes and windings. Finite-element method (FEM) of electromagnetic field computation can accurately build mathematical model of PMSMs and then it has become a powerful tool for the analysis and design of PMSMs. In this dissertation, in order to realize design automation and solution optimization, C++ programming with optimization algorithm is used to select motor design parameters with the combination of FEM. After setting objective functions of machine to be designed, the computer program can automatically calculate and find multiple sets of motor parameters which meet the design goals. The differential evolution (DE) algorithm deals with the results from FEM and then optimally select one set of parameters for the next FEM computation. In this dissertation, a real case study is used to detect the effect of the method in the practical engineering field. This company's production is an electrical propulsion so the capability of designed motor is to promote propeller and drive the boat. By modeling and simulating that company's original products, then through applying the technical method in this paper, starting applications written in C++, according to the company to provide the related technical data, the optimized result can be obtained. Compared the final optimization motor with company's original electric machine, motor performance has been greatly improved. Heat losses can be reduced dramatically and the motor efficiency can be controlled to 90%. In this dissertation, a novel dual-layer PM-excited (DPME) structure is designed with PMs on the stator and the rotor. And the stator magnets facing the air gap side are N pole, while the rotor magnet facing the air gap side are both N poles and S poles. When putting out same torque and power, dual-layer PMESM can reduce the usage of material because the size is much smaller. And smaller size motor is just what motor designers expected. This simulation indicates dual-layer PMESM has potential to be researched and it can help improve motor's performance.

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