[1] K M Rahman, N R Patel, T G Ward, et al. Application of direct-drive wheel motor for fuel cellelectric and hybrid electric vehicle propulsion system[J]. IEEE Trans. Ind. Appl . , 2006, 42(5):1185-1192.
[2] R J Wang, M J Kamper, K V Westhuizen, et al. Optimal design of a coreless stator axial flux permanent-magnet generator[J]. IEEE Trans. Magn., 2005, 41(1):55-64.
[3] B Xia, M J Jin, J X Shen, et al. Design and analysis of an air-cored axial flux permanent magnet generator for small wind power application[C]. IEEE Int. Sustainable Energy Technologies Conf., 2005.
[4] Z Q Zhu. Recent advances on permanent magnet machines[J]. Transactions of China Electrotechnical Society, 2012, 27(3):1-11.
[5] F X Wang. Application and development tendency of PM machines in wind power generation system[J]. Transactions of China Electrotechnical Society, 2012, 27(3):12-24.
[6] R L Ficheux, F Caricchi, F Crescimbini, et al. Axial flux permanent-magnet motor for direct-drive elevator systems without machine room[J]. IEEE Trans. Ind. Appl . , 2001, 37(6):1693-1701.
[7] J F Eastham, F Profumo, A Tenconi, et al. Novel axial flux machine for aircraft drive: design and modeling[J]. IEEE Trans. Magn., 2002, 38(5):3003-3005.
[8] S R Huang, J L, F Leonardi, et al. A comparison of power density for axial flux machines based on general purpose sizing equations[J]. IEEE Trans. Energy Conversion, 1999, 14(2):185-192.
[9] A Gavagnino, M Lazzari, F Profumo, et al. A com- parison between the axial flux and the radial flux structures for PM synchronous motors[C]. IEEE Int. Ind. Appl . Annual Meeting , 2001.
[10] S R Huang, M Aydin, T A Lipo. Torque quality assess- ment and sizing optimization for surface mounted permanent magnet machines[C]. IEEE Int. Ind. Appl. Society Annual Meeting , 2001.
[11] M Aydin, Z Q Zhu, T A Lipo, et al. Minimization of cogging torque in axial-flux permanent-magnet machines: design concepts[J]. IEEE Trans. Magn., 2005, 43(9): 3614-3622.
[12] S Huang, M Aydin, T A Lipo. Electromagnetic vibration and noise assessment for surface mounted PM machines [C]. Power Engineering Society Summer Meeting, 2001.
[13] C L Xia. Wind energy conversion system based on PMSG and its power converter technology[J]. Transac- tions of China Electrotechnical Society, 2012, 27(11): 1-13.
[14] W Fei, P C K Luk. Design and performance analysis of a high-speed air-cored axial-flux permanent-magnet generator with circular magnets and coils[C]. IEEE Int. Electric Machines and Drives Conf., 2009.
[15] W Wang, Z H Song, J Chen, et al. The calculation of natural frequencies of stator system and electro- magnetic acoustic noise of AFIR disc PM machine[J]. Electric Machiens And Control, 2009, 13(6):857-861.