【作者】 张亮亮；

【导师】 李立毅；

【作者基本信息】 哈尔滨工业大学 ， 电气工程， 2009， 硕士

【摘要】 随着现代电力电子技术的发展和永磁材料性能的不断提高,永磁同步电机具有的高效、高功率密度等特性得以进一步体现,广泛应用于生产生活的各个领域。在机床加工等领域,用永磁同步电机代替传统的感应电机和直流电机具有很大的优势,但是,由于机床的恒功率运行范围宽,而永磁同步电机的永磁体励磁作用恒定存在,使得电机的恒功率弱磁变得较为困难。本文从永磁同步电机的弱磁原理入手,分析了国内外在该领域的研究成果,总结和对比了国内外所提出的各种利于弱磁调速的永磁同步电机结构。从增大直轴电感的角度,基于Ansoft Maxwell 2D有限元仿真软件,对适于弱磁调速的各种电机结构进行了仿真计算,在分析和比较各种转子结构后,采用适合于弱磁控制的电机结构,分析了影响直轴电感的因素,并对电机的电抗参数进行了计算,从增大直轴电感的角度,选取内置V字型分段式转子作为样机的结构,而后确定了电机的基本参数,从磁路计算和有限元仿真的角度所设计的电机进行了验证。同时,由于机床高精度加工的要求,使电机需要有足够小的转矩脉动。本文在分析了引起电机转矩脉动的原因后,提出对永磁体的隔磁磁桥形状进行优化的方法,有效减小了电机的转矩脉动,同时避免了对电机结构的复杂改造,减小了加工工艺的困难和生产成本。根据上述分析和仿真结果,设计并研制了内置分段式V型结构永磁体排列永磁同步电机的试验样机,并对其进行了实验研究。实验结果与仿真结果基本吻合,从而验证了设计的正确性。更多还原

【Abstract】 With the development of modern power electronic technology and performance of permanent magnet, permanent magent synchronous motor(PMSM) reveals its high effiency and high power density, so it is widely used in various fields of producting and living. In the field of machining, it has great superiority with PMSM instead of induction motor and direct current motor. But machine tool needs wide constant power operating range and the role of permanent magnet excitation constantly presents, flux-weakening becomes difficult.This paper analyses the principle of flux-weakening and researshes of this field at home and abroad, summarizes and compares the various PMSM structures that fit for flux-weakening. From the view of incresing direct-axis inductance, based on finite element analyse(FEA) software-Ansoft Maxwell 2D, this paper calultes various FEA structures that fit for flux-weakening, t adopts segmented permanent magent as the prototype motor in order to increase direct-axis inductance and be fit for constant power operating, and makes sure the parameter of the motor, then confirms the module from the magnetic circuit and FEA.Because of the high precision machining, the motor needs small enough torque ripple. This paper analyses the reasons of torque ripple and optimizes the structure of flux barrier, this mathod avoids the complicated structure and high cost. And the result from FEA confirms the theory. According to analyse and FEA, a prototype motor is produced. The experiment result confirms the theory and FEA.更多还原