| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系 === 102 === This thesis is to apply non-rare earth magnet to permanent magnet electric machine design which considers the constraints of post-assembly magnetization. The non-rare earth magnet benefits from cost effective and stable source. The non-rare earth magnet here is Ferrite magnet.
This study first discusses the characteristics of Ferrite magnet. The difference between rare earth and non-rare earth magnet is that the remanence of ferrite magnet is weaker, with only about one third of rare earth. To improve performance, the electric machine is designed with a concentrated flux rotor. However, the complexity of the rotor structure causes difficulties for assembly work. Therefore, post-assembly magnetization proposed in this thesis is to simplify the assembly process. While applying post-assembly magnetization for concentrated flux rotor, magnetizing direction is different from surface permanent magnet rotors. This thesis investigates magnet properties through materials testing and proposes a magnet model for post-assembly magnetization. This can be provided for machine design with post-assembly magnetization. Based on specifications, this thesis combines magnetic circuit model and constraints of post-assembly magnetization to design a Ferrite magnet interior permanent magnet synchronous machine (IPMSM). Simulations and experiments are conducted to verify the design results. The experiment results agree well with the theoretical design. This confirm the design results of IPMSM through the proposed post-assembly magnetization method.
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