仟瓦級軸向磁通風力發電機之設計與分析

Design and Analysis of Kilowatt Axial-Flux Generator for Wind Power Applications

吳昱勳(Yu-Hsun Wu)

指導教授 ： 王培仁

國立清華大學/工學院/動力機械工程學系/碩士(2010年)

https://doi.org/10.6843/NTHU.2010.00050

摘要

由於風力發電技術大幅提昇及市場需求快速增加，中小型風力發電系統已成為主要之綠色能源發展方向，因此近年來都朝著高性能、高效率以及創新結構等方面進行研究與改善。本研究採用非晶質材料為軟磁材料進行設計與分析，因非晶質材料較傳統矽鋼片有較低鐵損及高導磁率之優勢，可達成更高的能源轉換效率，但用為材料厚度較薄且性脆，故使用捲繞的方式成型，適用於軸向磁通之磁路設計方式，配合稀土永磁激磁，用於軸向磁通式風力發電機以茲驗證。
在選定材料之後針對軸向磁通式發電機之設計與分析進行探討，先分析其基本結構與磁路，再選用雙面定子單面轉子的結構，完成細部設計，並且使用電腦輔助模擬軟體將其進行建模與參數分析，最後接上負載電路，分析不同輸出功率時之工作特性與效率，期望能降低發電機之鐵損和線圈之銅損，以提昇整體發電機的效率，達到預期特性與額定輸出。

關鍵字

風力發電 ； 軸向磁通 ； 非晶質材料

並列摘要

As the technology advancement in wind energy and the increases in market needs, the development for high performance and efficiency wind-generators has motivated researchers to consider utilizing innovative design and new materials for small and medium size electrical machines. The objectives of this thesis are to design a high performance axial-flux permanent magnet brushless machine (AFPM) with Amorphous Ferromagnetic Alloys serving as the magnetic conducting circuits. And, utilization of high-energy density NdFeB permanent magnets for rotor design is to complete a double-side Axial-flux PM generator. The data sheets of nickel-iron based amorphous alloys indicate very low power-losses under medium frequency as well as low eddy-current losses due to very thin thickness. Moreover, the amorphous alloys also exhibit electromagnetic properties for both high electrical resistivity and permeability.
After selection of appropriate magnetic materials, we start the design process by firstly going to specify the performance requirements and the basic pertinent dimensions of the generator. Then, based upon double-sided stator and single rotor structure, we adopt finite element methods for parametric analysis with all pertinent parameters. We finally complete the design and analysis by simulating the operational characteristics and efficiency for reduction in iron and copper losses so that the expected specifications are met.

並列關鍵字

wind-power generator ； axial-flux ； amorphous

參考文獻

[12] C. C. Hwang, S. P. Cheng, and C. M. Chang, “Design of High-Performance Spindle Motors with Concentrated Windings,”IEEE Trans on Magnetics, Vol. 41, No. 2, pp. 971-973, Feb. 2005.

[13] B. J. Chalmers, W. Wu, E.Spooner; “An axial-flux permanent-magnet generator for a gearless wind energy system”,Power Electronics, Drives and Energy Systems for Industrial Growth, 1996. Volume 1, 8-11 Page(s):610 - 616 vol.1, Jan. 1996.

[14] Y. Chen, P. Pillay, ” Axial-flux PM wind generator with a soft magnetic composite core”, Industry Applications Conference Fourtieth IAS Annual Meeting. Volume 1, 2-6 Oct. 2005 Page(s):231 - 237 Vol. 1, 2005.

[15] C.T. Liu, T.S.Chiang, J.F.D. Zamora, S.C. Lin, “Field-oriented control evaluations of a single-sided permanent magnet axial-flux motor for electrical vehicle applications” , IEEE Trans. On Magnet , vol.39,no.5, pp. 3280-3282, Sep. 2003.

[16] W. Wu, V. S. Ramsden, T. Crawford, G. Hill, “ A Low-Speed, High-Torque, Direct-Drive Permanent Generator, ”IEEE Conference on Industry Applications, vol. 1, pp.147-154, 2000.