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类型 基础研究 预答辩日期 2017-11-29
开始(开题)日期 2016-07-05 论文结束日期 2017-09-29
地点 动力楼316 论文选题来源 国家自然科学基金项目     论文字数 5.1 (万字)
题目 高速盘式永磁电机的设计及多物理场分析
主题词 电机设计,高速盘式永磁电机,解析法,集总参数网络法,多物理场快速分析
摘要 本文以高速盘式永磁电机为研究对象,采用解析法与集总参数网络法为主要研究手段,对电磁计算、损耗分析与热计算、电磁振动及机械应力校核等开展一系列研究工作,以促进该类电机的理论与技术发展及工程应用。 论文主要研究内容与创新成果包括以下几个方面: (1)以常见结构的盘式永磁电机为研究对象,对现普遍的四种电磁解析算法(实数保角变换、复数保角变换、许克变换与精确子域法)进行推导,继而对计算所得到的气隙磁密、反电动势与齿槽转矩进行了对比分析,给出了各种算法的优劣性以及适用特点。最后,通过电流片法对电枢磁场进行了计算,完善了采用相对空气磁导率类方法的计算体系。本文首次采用许克变换对盘式电机气隙相对磁导率进行求解,指出了K域变换的必要性并给出了求解过程。 (2)针对Halbach阵列结构高速盘式永磁电机,在直角坐标系下建立精确子域模型,并对设计电机进行反电动势、齿槽转矩、输出转矩等电磁性能计算。采用磁网络与解析算法,分别对对非晶合金定子铁心与永磁体涡流损耗进行计算,通过有限元计算验证了算法的正确性。本文建立的精确子域模型具有一定普适性,可适用于任意磁极组合、充磁强度、充磁方向的排列结构;此外,本文提出的电枢磁场计算方法也具有一定普适性,适用于任何绕组排列结构。 (3)基于计算流体力学理论,深入研究了高速盘式永磁电机风摩损耗与散热系数,并给出了详细的计算公式。在考虑磁-热耦合的基础上,进行集总参数热网络模型的搭建,以适用于快速计算场合。最后,通过FVM模型验证了温升模型与风摩损耗计算的正确性。其中,采用系数提取与拟合的方式求解散热系数与气隙内温度,可大大提高集总参数网络模型的精确性,并降低求解矩阵维度。 (4)研究了盘式永磁电机振动,对引起噪声的原因进行了说明,重点阐述并分析了引起电磁振动的电磁应力;指出了盘式电机定子系统自然频率计算与径向电机的不同之处,并结合薄板理论,给出了盘式永磁电机自然频率、等效刚度等计算方法;基于等效机械网络思想,在考虑机壳表面形变相互影响的基础上,对定子表面振动进行计算。通过有限元方法验证算法的正确性,并对盘式永磁电机噪声进行数值模拟。 (5)采用解析算法对高速盘式永磁电机机械方面进行校核。基于永磁体受力计算结果,提出了一种永磁安装方式;针对转子背铁进行受力分析并进行转子动力学分析以确定运行的稳定;对盘式电机加工过程中易产生的偏心状况,采用许克变换进行了解析建模,对各偏心情况情况下的气隙磁密、磁链与反电动势进行对比分析。其中,首次采用许克变换,对盘式电机偏心状况进行建模计算,降低了计算时间提高了计算的精度。 (6)完成了高速盘式永磁电机制作加工并进行了实验研究。详细阐述了在加工过程中的非晶合金铁心安装、Halbach永磁体固定加工、绕组卷绕与定位、灌封成型等问题,最终完成样机的制作。对电机进行反电势与直流温升测量,验证了文中算法的正确性。文中提出了非晶合金定子与Halbach转子安装方法,结果表明,文中提出的加工方法切实可行,可以为盘式电机的加工提供指导。
英文题目 Design and Multi-Physical Fields Analysis of High Speed Axial Flux Permanent Magnet Mchine
英文主题词 Electrical Machine Design, High Speed Axial Flux Permanent Magnet Machines, Analytical Approach, Lumped Parameters Network, Fast Multi-Physical Field Analysis.
英文摘要 In this dissertation, the High Speed Axial Flux Permanent Magnet Machines (HSAFPMMs) are analyzed based on the analytical and lumped parameters network approaches. A series of works on HSAFPMMs are expanded in this thesis such as the magnetic flux densities calculation, the losses and thermal analysis, the vibration and mechanical verification, etc. The works in this thesis hold significant value for the theory development and engineering application of HSAFPMMs. The fruits and the main contributions of this thsis are as follows: 1. A traditional AFPM motor with semi-closed slots and symmetric N-S poles is taken as the prototype to evaluate the performances of four magnetic analytical approaches. To be more precise, the real conformal mapping, the complex conformal mapping (CM), the Schwarz-Christoffel (SC) Mapping and the subdomain (SD) approach are modeled under Cartesian coordinate system. The pros and cons of each method are demonstrated after comparing the cogging torque, back EMFs, etc. Finally, the current sheet approach is adopted to calculate the armature field which completes the computational system of relative permeance method. The main contribution of this section is using the SC model to calculate the relative permeance function. The reason why K plane is necessary and the detailed processes are shown in thesis. 2. The subdomain model for HSAFPMMs with Halbach PM array is solved under Cartesian coordinate system. Afterwards, the back EMFs, cogging torque, output torque of AFPM motor are analyzed. Based on the magnetic flux density calculated as in previous section, the iron loss and PM eddy current loss are obtained by magnetic reluctance circuit and analytical model respectively. The main contribution of this section is the SD model which can be used for any Halbach array and magnetization directions. Moreover, the armature calculation method proposed in thesis can be easily adapted for any winding structures. 3. Based on computational fluid dynamics (CFD), the friction loss and heat transfer coefficient of HSAFPMMs are researched and the detailed equations are given in the thesis. Based on the previous study, the lumped parameters thermal network (LPTN) considering magnet-thermal coupling is developed. Finally, the accuracy of CFD model is validated by comparing the results with that obtained by LPTN. The main contributions of this section include the prediction of temperature in the airgap and the heat transfer coefficient via fitting method, which shows higher accuracy and can reduce the matrix dimension. 4. The vibration of HSAFPMMs is studied in this thesis. The reasons resulting in the vibration and noise are explained firstly. Moreover, the Maxwell tensor which is the main source of vibration is studied. Secondly, the differences of the calculation of nature frequency between radial flux and axial flux machines are pointed out. Afterwards, the nature frequency, stiffness and damping ration are calculated based on the thin plate theory. Finally, the frame velocity is obtained using mechanical network which considering the forces in different teeth. The work is then compared with the FE model. 5. The mechanical issues are examined by using analytical approach. More precisely, a new assembling approach is proposed based on the axial force research and the stability of rotor system are checked by rotor dynamics as well as the thickness of rotor back-plate. The rotor eccentricities are also considered in the thesis. The flux densities, flux linkages and back EMFs are modeled by SC approach. The main contribution of this section is the eccentricity model, which was firstly developed by SC approach, and the proposed model is fast and have acceptable accuracy. 6. The detailed assembling procedures of HSAFPM machine are reported in the thesis, it consists the detailed handing method of AMM stator core, Halbach PMs and windings. Afterwards, the back EMFs and temperature rise under direct current were tested to verified the models mentioned above. The new assembling approach in the thesis for the stator core and PMs was proposed, the results show that this approach is effective.
学术讨论
主办单位时间地点报告人报告主题
东南大学 2017.7.20 礼东春晖堂 Thomas Jahns Understanding PMMs Fault Behavior and the Impact of Excitation on Mitigation Techniques
南京航空航天大学 2017.7.10 自动化学院1号楼303 Thomas Jahns Can current-source inverters succeed in future machine drives?
东南大学 2016.1.20 礼东春晖堂 马伟明 科研创新实践与体会
东南大学 2017.6.13 动力楼316 朱建国 Robust Design Optimization Methods for High Quality Producible Electrical Drive Systems
永磁电机研究所 2017.6.30 动力楼316 郭保成 2017年6月工作总结
永磁电机研究所 2017.7.30 动力楼316 郭保成 2017年7月工作总结
课题组 2017.7.15 动力楼226 郭保成 大功率电机散热方式总结
课题组 2017.6.15 动力楼226 郭保成 两种结构电机综合对比分析
     
学术会议
会议名称时间地点本人报告本人报告题目
ASEMD2015 2015.11.20 上海 Thermal Analysis of the Conical Rotor Motor Using LPTN With Accurate Heat Transfer Coefficients
ICEMS2014 2014.10.22 杭州 Investigation of the Heat Transfer Coefficient on the Fins for TEFC
     
代表作
论文名称
Analytical modeling of axial flux PM machines with eccentricities
Analytical Modeling of Manufacturing Imperfections in Double-Rotor Axial Flux PM Machines: Effects o
A Fast Analytic Model of Axial Flux Permanent Magnet Machines with Static/Dynamic Axis Eccentricity
Thermal Analysis of the Conical Rotor Motor Using LPTN With Accurate Heat Transfer Coefficients
 
答辩委员会组成信息
姓名职称导师类别工作单位是否主席备注
张卓然 正高 教授 博导 南京航空航天大学
徐伟 正高 教授 博导 华中科技大学
张品佳 副高 副教授 博导 清华大学
花为 正高 教授 博导 东南大学
樊英 正高 教授 博导 东南大学
      
答辩秘书信息
姓名职称工作单位备注
阳辉 其他 讲师 东南大学