电动自行车用轮毂电机设计及其特性研究-机械设计及理论专业论文.docxVIP

哈尔滨工业大学工学硕士学位论文 哈尔滨工业大学工学硕士学位论文 哈尔滨工业大学工学硕士学位论文 哈尔滨工业大学工学硕士学位论文 - - PAGE IV - - - III - Abstract In the 21st century, climate warming and energy crisis have become the common challenges for humans. Researching the electric bicycle (EB) which has the advantages of energy saving and environmental protection become an important way to solve these problems. The wheel motor is the core of EB, and its performances are decisive factors for realizing the function of EB. At present, wheel motor has the disadvantages of high loss, performance instability and low efficiency. Researching a wheel type permanent magnet synchronous motor (WPMSM) which has the advantages of high control accuracy, reliable structure, good stability and high efficiency has important significance. In order to determine the overall scheme of wheel motor, firstly, analyzed the requirements of wheel motor for electric bicycle. Calculated the kinetic and dynamic parameters of wheel motor; determined the driving force and output torque of wheel motor. Then, by analyzing motor constant and choosing relevant parameters, calculated the main dimensions of wheel motor, and then, determined general mechanical scheme. Further, introduced the concept of unit motor; compared the different winding and pole tooth slot scheme, and determined general electromagnetic scheme of wheel motor. By using JMAG software, finite element analysis for the air-gap magnetic field of wheel motor was carried out, determined reasonable air gap length, and optimized the air-gap flux density wave. Through analyzing the armature magnetic dense, output torque and efficiency, the tooth width and yoke high of motor stator armature were optimized, and determined the width and thickness of permanent magnet structure parameters by the same design optimization method. Considering comprehensively the permanent magnetism materials performance and cost of magnetization, chose magnetic higher NdFeB materials and parallel magnetization way. And then