Structural Analysis and Optimum Design of a 50kW DC Motor

• Main Authors: Yan-Zuo Chen, 陳彥佐
• Other Authors: Tien-Tung Chung
• Format: Others
• Language: en_US
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/02226843908052018115

碩士 === 國立臺灣大學 === 機械工程學研究所 === 102 === This thesis studies the structural analysis and optimum design of a 50 kW DC motor for electric vehicles. The motor components include stator structure, front cover, rear cover, and disk cover. The stator contains yoke, stator-core and windings. First, the solid models of motor components are established by CAD software AutoCAD and transferred to FEM software ANSYS for generating finite element models. Then, the structure characteristics of the components, subassemblies and entire assembly are analyzed by FEM modal analysis and verified with experimental modal testing results. In addition, the electromagnetic forces are applied to the teeth tips of the stator-core and the frequency responses of the entire assembly are calculated by FEM harmonic response analysis. Finally, the stiffness of the redesigned 50 kW motor structure is improved by using the optimum design method. Design variables of the new motor structure are selected according to larger sensitivity ratios of the first natural frequency. With given design variables, a parametric drawing program is also developed for establishing the solid model of the new motor. The structural optimization is performed to improve the first natural frequency and not to increase the original weight of the new motor. Compared to the original design, the first natural frequency of the optimum design is increased by 2.2%, while the motor weight is maintained unchanged.