The Rotor Heat Dissipation Problem of Low Speed and HighTorque Permanent Magnet Motor
Chen Lixiang1,Xie Zhilin1,Wang Xuebin2
1.National Engineering Research Center for REPM Electrical Machine Shenyang University of Technology Shenyang 110870 China 2.AVIC Guiyang Wanjiang Aviation Electromechanical Co.Ltd. Guiyang 550018 China
Abstract：In this paper,the temperature rise was calculated by finite element method with a low speed and high torque permanent magnet motor,and the accuracy of the calculation method was verified by the experiment.The temperature rise of the motor was low,so the design was improved,the length of the iron core was shortened,the torque density was increased,and the material was saved.But in the improved motor,the high temperature of the rotor and permanent magnet(PM)can lead to PM demagnetization.Therefore,this paper has carried out the researching on this problem,the theoretical analysis and the calculation of fluid solid coupling method were used to solve the problem that the heating of the rotor of the improved motor.Firstly,the factors that affect the intensity of convective heat transfer were analyzed,and then the heating problem was solved by the installation of cooling wind thorn and rotor axial/radial ventilation duct.The heat dissipation effect of PM with different size of wind thorn was studied.The heat dissipation effect and temperature rise distribution of PM with the rotor axial/radial ventilation duct was studied.The accuracy of the research and the validity of the method were verified by the experiment.The research on the heat dissipation problem of the rotor has a certain guiding role for the design of the low speed and high torque permanent magnet motor.
[1] 李伟力,陈婷婷,曹君慈,等.高压永磁同步电动机永磁体隔热分析[J].电机与控制学报,2012,16(2):12-17. Li Weili,Chen Tingting,Cao Junci,et al.Thermal-insulation analysis of permanent magnets in high voltage PMSM[J].Electric Machines and Control,2012,16(2):12-17. [2] 陈萍,唐任远,佟文明,等.高功率密度永磁同步电机永磁体涡流损耗分布规律及其影响[J].电工技术学报,2015,30(6):1-9. Chen Ping,Tang Renyuan,Tong Wenming,et al.Permanent magnet eddy current loss and its influence of high power density permanent magnet synchronous motor[J].Transactions of China Electrotechnical Society,2015,30(6):1-9. [3] 佟文明,朱晓锋,贾建国,等.时间谐波对永磁同步电机损耗的影响规律[J].电工技术学报,2015,30(6):60-69. Tong Wenming,Zhu Xiaofeng,Jia Jianguo,et al.Influence law of additional losses induced by time harmonic in permanent magnet synchronous motors[J].Transactions of China Electrotechnical Society,2015,30(6):60-69. [4] 程树康,李翠萍,柴凤.不同冷却结构的微型电动车用感应电机三维稳态温度场分析[J].中国电机工程学报,2012,32(30):82-90. Cheng Shukang,Li Cuiping,Chai Feng.Analysis of the 3D steady temperature field of induction motors with different cooling structures in mini electric vehicles[J].Proceedings of the CSEE,2012,32(30):82-90. [5] 李伟力,王耀玉,黄东洙.转子通风结构对永磁电机转子流体场和温度场的影响[J].北京交通大学学报,2015,39(2):48-54. Li Weili,Wang Yaoyu,Huang Dongzhu.Influence of the rotor ventilation structure on the rotor fluid and temperature field of the PMSM[J].Journal of Beijing Jiaotong University,2015,39(2):48-54. [6] 王泽忠,严烈通.异步电机斜槽转子三维涡流场计算[J].中国电机工程学报,1995,15(2):118-123. Wang Zezhong,Yan Lietong.The calculation of 3D eddy current field of induction motor rotor slot[J].Proceedings of the CSEE,1995,15(2):118-123. [7] 常正峰,黄文新,胡育文,等.基于二维解析法的光滑表面实心转子感应电机附加损耗的研究[J].中国电机工程学报,2007,27(21):83-88. Chang Zhengfeng,Huang Wenxin,Hu Yuwen,et al.Research on stray loss of smooth surface solid rotor induction motor based on 2D analytical approach[J].Proceedings of the CSEE,2007,27(21):83-88. [8] Niu Shuangxia,Ho S L,Fu W N,et al.Eddy current reduction in high-speed machines and eddy current loss analysis with multislice time-stepping finite-element method[J].IEEE Transactions on Magnetics,2012,48(2):1007-1010. [9] 付兴贺,林明耀,徐妲,等.永磁-感应子式混合励磁发电机三维暂态温度场的计算与分析[J].电工技术学报,2013,28(3):107-113. Fu Xinghe,Lin Mingyao,Xu Da,et al.Computation and analysis of 3D-transient temperature field for a permanent magnet-induction hybrid excitation generator[J].Transactions of China Electrotechnical Society,2013,28(3):107-113. [10]张凤阁,杜光辉,王天煜,等. 1.12 MW 高速永磁电机不同冷却方案的温度场分析[J].电工技术学报,2014,29(增刊1):66-72. Zhang Fengge,Du Guanghui,Wang Tianyu,et al.Temperature field analysis of 1.12 MW high speedpermanent magnet machine with different cooling schemes[J].Transactions of China Electrotechnical Society,2014,29(S1):66-72. [11]Camilleri R,Howey D A,McCulloch M D.Thermal limitations in air-cooled axial flux in-wheel motors for urban mobility vehicles:a preliminary analysis[C]//Electrical Systems for Aircraft,Railway and Ship Propulsion(ESARS),Bologna,Italy,2012:1-8. [12]Tong Wenming,Tang Renyuan,An Zhongliang,et al.Water cooling system design and thermal analysis for low speed permanent magnet machines[C]//Electrical Machines and Systems(ICEMS),Beijing,China,2011:1-4. [13]路义萍,潘庆辉,孙雪梅,等.湍流模型变化对汽轮发电机转子热流场影响[J].电机与控制学报,2014,18(11):72-77. Lu Yipping,Pan Qinghui,Sun Xuemei,et al.Effect of turbulence models on temperature and flow field for turbo-generator rotor[J].Electric Machines and Control,2014,18(11):72-77. [14]王晓远,高鹏,赵玉双.电动汽车用高功率密度电机关键技术[J].电工技术学报,2015,30(6):53-59. Wang Xiaoyuan,Gao Peng,Zhao Yushuang. Key technology of high power density motors in electric vehicles[J].Transactions of China Electrotechnical Society,2015,30(6):53-59. [15]魏永田,孟大伟,温嘉斌.电机内热交换[M].北京:机械工业出版社,1998. [16]朱自强.应用计算流体力学[M].北京:北京航空航天大学出版社,1998. [17]李伟力,陈玉红,霍菲阳,等.大型水轮发电机转子旋转状态下磁极间流体流动与温度场分析[J].中国电机工程学报,2012,32(9):132-139. Li Weili,Chen Yuhong,Huo Feiyang,et al.Fluid flow and temperature field analysis between two poles of a large air-cooled hydro-generator rotor in rotation[J].Proceedings of the CESS,2012,32(9):132-139. [18]Zhang Yujiao,Ruan Jiangjun,Huang Tao,et al.Calculation of temperature rise in air-cooled induction motors through 3-D coupled electromagnetic fluid-dynamical and thermal finite-element analysis[J].IEEE Transactions on Magnetics,2012,48(2):1047-1050.
2017, Vol. 32 
