Abstract In an open-winding machine, the three-phase stator currents can be controlled to contain the same harmonic current components like the third harmonics. This paper introduces a new harmonic current excitation principle in synchronous machines based on open winding controls. Unlike existing harmonic excitation technologies which utilizing the third harmonic components of rotor magnetic fields, this brushless harmonic excitation principle is realized by injecting the third harmonic current component or high frequency single-phase current component or DC component into the three phase stator open windings, to generate a time pulsating magnetic field which can induce back-EMFs in the specially designed rotor harmonic coils. Through rectification, the induced back-EMFs are used to supply DC current to the rotor excitation winding. To verify the above principle, magnetic field calculations and prototyping tests were carried on. The significance of this harmonic excitation principle is to provide a new brushless machine option to reduce the consumption of increasingly expensive rare earth permanent magnetic material by machines in some applications.
[1] 吴红星, 赵凯岐, 王胜劲, 等. 一种新型混合励磁开关磁阻电机[J]. 电工技术学报, 2013, 28(7): 56-63. Wu Hongxing, Zhao Kaiqi, Wang Shengjin, et al. A novel hybrid excitation switched reluctance motor[J]. Transactions of China Electrotechnical Society, 2013, 28(7): 56-63. [2] Amara Y, Vido L, Gabsi M, et al. Hybrid excitation synchronous machines: energy-efficient solution for vehicles propulsion[J]. IEEE Transactions on Vehicular Technology, 2009, 58(5): 2137-2149. [3] Sulaiman E, Kosaka T, Matsui N. A novel hybrid excitation flux switching synchronous machine for a high-speed hybrid electric vehicle applications[C]. International Conference on Electrical Machines and Systems, Beijing, 2011: 1-6. [4] 赵朝会. 串联磁路混合励磁爪极发电机的结构设计和特性[J]. 电工技术学报, 2009, 24(5): 1-6. Zhao Chaohui. Structure designing and characteristic study of HECPG which magnetic circuit series connec- tion[J]. Transactions of China Electrotechnical Society, 2009, 24(5): 1-6. [5] Shanming W, Yonghong X, Xiangheng W. State of the art of hybrid excitation permanent magnet synch- ronous machines[C]. International Conference on Electrical Machines and Systems, Incheon, Korea, 2010: 1-6. [6] 夏永洪, 王善铭, 黄劭刚, 等. 齿谐波励磁的混合励磁永磁同步发电机[J]. 清华大学学报(自然科学版), 2011, 51(11): 1557-1561. Xia Yonghong, Wang Shanming, Huang Shaogang, et al. Hybrid excitation permanent magnet synchronous generator utilizing tooth harmonics for the excita- tion[J]. Journal of Tsinghua University(Science and Technology), 2011, 51(11): 1557-1561. [7] 夏永洪, 王善铭, 邱阿瑞, 等. 新型混合励磁永磁同步发电机齿谐波电动势的协调控制[J]. 电工技术学报, 2012, 27(3): 56-61. Xia Yonghong, Wang Shanming, Qiu Arui, et al. Coordinated control of tooth harmonic EMF of novel hybrid excitation permanent magnet synchronous machine[J]. Transactions of China Electrotechnical Society, 2012, 27(3): 56-61. [8] 朱姝姝, 刘闯, 宁银行, 等. 一种切向/径向混合励磁无刷同步发电机系统[J]. 电工技术学报, 2013, 23(3): 127-133. Zhu Shushu, Liu Chuang, Ning Yinhang, et al. A generation system based on tangential/radial hybrid excitation synchronous generator[J]. Transactions of China Electrotechnical Society, 2013, 23(3): 127-133. [9] 耿伟伟, 张卓然, 于立, 等. 新型并列式混合励磁无刷直流电机结构原理及其磁场调节特性[J]. 电工技术学报, 2013, 28(11): 131-137. Geng Weiwei, Zhang Zhuoran, Yu Li, et al. Operation principle and flux regulation characteristics of a new parallel hybrid excitation blushless DC machine[J]. Transactions of China Electrotechnical Society, 2013, 28(11): 131-137. [10] 赵梅花, 阮毅, 杨勇, 等. 直驱式混合励磁风力发电系统控制策略的研究[J]. 电力系统保护与控制, 2010, 38(12): 19-23. Zhao Meihua, Ruan Yi, Yang Yong, et al. Control strategy study on direct-driven type hybrid excitation wind power system[J]. Power System Protection and Control, 2010, 38(12): 19-23. [11] 王毓东, 罗荣杰, 郑元耀. 汽轮发电机谐波励磁的分析[J]. 浙江大学学报, 1978(1): 91-114. Wang Yudong, Luo Rongjie, Zheng Yuanyao. The analysis of harmonic excitation on turbo generator[J]. Journal of Zhejiang University, 1978(1): 91-114. [12] 合肥工业大学电机系电机教研室. 谐波励磁方式之探讨[J]. 中小型电机技术情报, 1974(2): 41-46. The machine teaching and research section of Hefei university of technology. The study of harmonic excitation mode[J]. Small and Medium-Sized Machine Technical Intelligence, 1974(2): 41-46. [13] 合肥工业大学电机系电机教研室. 谐波励磁方式之再探讨[J]. 合肥工业大学学报, 1975(1): 69-80. The machine teaching and research section of Hefei university of technology. The further study of harmonic excitation mode[J]. Journal of Hefei University of Technology, 1975(1): 69-80. [14] 黄劭刚, 夏永洪, 张景明, 等. 谐波励磁同步发电机空载谐波磁场分析[J]. 电机与控制学报, 2005, 9(1): 55-58. Huang Shaogang, Xia Yonghong, Zhang Jingming, et al. The analysis of no-load harmonic electromagnetic field of a harmonic excited synchronous generator[J]. Electric Machines and Control, 2005, 9(1): 55-58. [15] 黄劭刚, 夏永洪, 徐龙权. 磁极极尖部饱和度对谐波励磁同步发电机谐波空载特性的影响[J]. 微电机, 2008, 41(1): 10-12. Huang Shaogang, Xia Yonghong, Xu Longquan. Effect of magnetic saturation on no-load harmonic property of synchronous generators by the third harmonic excitation[J]. Micromotors Servo Technique, 2008, 41(1): 10-12. [16] Ruuskanen V, Niemela M, Pyrhonen J, et al. Modeling the brushless excitation system for a synchronous machine[J]. IET Electric Power Applications, 2009, 3(3): 231-239.
2015, Vol. 30 
