Motor Design by Electromagnetic Finite Element Analysis

• Main Authors: Der-Hon Lin, 林德宏
• Other Authors: Yih-Ping Luh
• Format: Others
• Language: en_US
• Published: 2000
• Online Access: http://ndltd.ncl.edu.tw/handle/23650546244638565986

博士 === 國立臺灣大學 === 機械工程學研究所 === 88 === This study develops an electromagnetic finite element analysis system. The goals of this study are to develop a flexible and integrated design system, which can be used for teaching, research and practical applications. The destinations of developing the electromagnetic finite element analysis system are as follows: 1. Accelerate the design speed and improve the design quality. 2. Simplify the design procedures to let the motor designers concentrate in motor design. 3. Shorten the period to cultivate a motor design engineer. 4. Accumulate the design technology and knowledge. The motor design system includes motor design knowledge, motor design templates, a two-dimensional mesher, a finite element assembler, a sparse matrix solver, a circuit solver, and so on. The design system can analyze the static and transient behavior of motors. In this paper, a new approach is also proposed to solve transient finite element field solutions with external circuits in electrical machines. In the proposed approach, an electrical machine is modeled by a two-dimensional finite element method, which is based on the indirect coupling method. The conventional indirect coupling method solves the finite element and circuit matrices separately. In order to do this, it is necessary to evaluate the coupling coefficients (mutual impedances and/or admittances) among the conductors in the finite element model, so that they can be used in the circuit model. Furthermore, the calculation of the coupling coefficients is time-consuming. The central kernel of the rotating coupling coefficient method is that rotating the initial coupling coefficients can derive the coupling coefficients for any rotor position. We only need to calculate the initial coupling coefficients, and then rotate the initial coupling coefficients for each rotation. Consequently, the total calculation time of the transient finite element analysis can be substantially reduced by using these rotated coupling coefficients. Details of the algorithm and the implementation of the electromagnetic finite element analysis system and the rotating coupling coefficient method are presented. And all the source codes are complied in the Microsoft Visual C++ and Visual Basic. Finally, many application examples are presented. These examples clearly demonstrate the powerful analysis tool even with very complicated problem geometry. Conclusions and possible extension of the project are also provided.