Abstract：Constant frequency double rotor(CFDR) permanent magnet wind generator is a new type machine which was proposed in recent years. It has the advantages of low speed direct-driven, high power density, and small capacity for power converter. So it has better prospect in application. CFDR generator has windings both in the stator and inner rotor, and poor heat dissipation conditions for inner rotor, and then thermal analysis is a key point in machine design. This paper presents an equivalent thermal network method based thermal analysis for CFDR generator. Firstly, the basic laws of heat transfer are introduced. Then the thermal network model for CFDR generator is set up. The parameters of thermal model, such as heat resistance, heat source are analyzed and calculated. Finally, heat balance equation for each node is established and the equations are solved. The steady-state temperature rising of CFDR generator is obtained and validated by the experiments.
[1] Hoeijmakers M J, Rondel M. The electrical variable transmission in a city bus[C]. Power Electronics Specialists Conference, 2004, 4(4): 2773-2778. [2] Hoeijmakers M J, Ferreira J A. The electric variable transmission[J]. IEEE Transactions on Industry Applica- tion, 2006, 42(4): 1092-1100. [3] 崔淑梅, 程远, 陈清泉. 先进汽车电气变速器[J]. 电工技术学报, 2006, 21(10): 111-116. Cui Shumei, Cheng Yuan, Chen Qingquan. An advanced electrical variable transmission for automobiles[J]. Transactions of China Electrotechnical Society, 2006, 21(12): 111-116. [4] Xu L, Zhang Y, Wen X. Multi-operational modes and control strategies of dual mechanical port machine for hybrid electrical vehicles[J]. IEEE Transactions on Industry Application, 2009, 45(2): 747-755. [5] Xu L. A new breed of electrical mchines-basic analysis and applications of dual mechanical port electric machines[C]. Proceedings of the 8th ICEMS, 2005, 1: 24-31. [6] 温旭辉, 赵峰, 范涛, 等. 基于双机械端口电机的新型电力无级变速系统研究[J]. 电工技术学报, 2007, 22(7): 24-28. Wen Xuhui, Zhao Feng, Fan Tao, et al. Research on novel electrical variable transmission based on dual mechanical port electric machines[J]. Transactions of China Electrotechnical Society, 2007, 22(7): 24-28. [7] Sun X, Cheng M, Zhu S, et al. Coupled electromagnetic- thermo-mechanical analysis for accurate prediction of dual mechanical port machine performance[J]. IEEE Transactions on Industrial Applications, 2012, 48(6): 2240-2248. [8] 孙西凯, 程明. 新型机电混合无级变速风力发电系统[J]. 中国电机工程学报, 2012, 32(3): 49-55. Sun Xikai, Cheng Ming. A novel wind power genera- tion system based on mechanical and electrical variable transmission[J]. Proceedings of the CSEE, 2012, 32(3): 49-55. [9] Nordlund E, Sadarangani C. The four-quadrant energy transducer[C]. Industry Applications Conference, 2002, 1: 390-397. [10] Zheng P, Liu R, Thelin P, et al. Research on the parameters and performances of a 4QT prototype machine used for HEV[J]. IEEE Transactions on Magnetics, 2007, 43(1): 443-446. [11] Zhang J, Cheng M, Zhu Y. A constant-frequency double-rotor generator for wind power application[C]. International Conference on Electric Machines and Systems, 2010: 583-587. [12] 王敏希, 张建忠, 程明. 定频双转子发电机的分数槽绕组选择和设计[J]. 微特电机, 2012, 40(5): 1-4. Wang Minxi, Zhang Jianzhong, Cheng Ming. Design of armature winding for constant-frequency double- rotor generator[J]. Small & Special Electrical Machines, 2012, 40(5): 1-4. [13] 鲍里先科АИ, 丹科ВГ, 亚科夫列夫АИ．电机中得空气动力学与热传递[M]. 魏书慈, 邱建普译．北京: 机械工业出版社, 1985. [14] Mellor P H, Roberts D, Turner D R. Lumped parameter thermal model for electrical machines of TEFC design[J]. Electric Power Applications, 1991, 138(5): 205-218. [15] 魏永田, 孟大伟．电机内热交换[M]．北京: 机械工业出版社, 1998. [16] 王北社, 窦满锋. 基于热网络法的高功率密度异步电动机定子温升计算[J]. 微特电机, 2006(11): 24-26. Wang Beishe, Dou Manfeng. Magnetomotive force in stator temperature calculation of high power density asynchronous motor based on thermal network[J]. Small & Special Electrical Machines, 2006(11): 24-26. [17] 杨世铭, 陶文铨．传热学[M]．北京: 高等教育出版社, 1998. [18] Pyrhönen J, Jokinen T, Hrabovcová V. Design of Rotating Electrieal machines[M]. Chiehester: John Wiley & Sons Ltd, 2008. [19] Grauers A. Design of direct-driven permanent-magnet generators for wind turbines[D]. Goteborg: Chalmers University of Technology, 1996. [20] 黄国治, 傅丰礼. Y2系列三相异步电动机技术手册[M]. 北京: 机械工业出版社, 2004. [21] 陈世坤. 电机设计[M]. 2版. 北京: 机械工业出版社, 1990. [22] 唐任远. 现代永磁电机理论与设计[M]. 北京: 机械工业出版社, 1982.
2015, Vol. 30 
