| Summary: | 碩士 === 國立清華大學 === 動力機械工程學系 === 98 === 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.
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