| Summary: | 碩士 === 國立臺灣大學 === 機械工程學研究所 === 100 === The objective of this work is to design a rare earth free permanent magnet machine for 25kW ferrite magnet machine. An important challenge of rare earth free machine is to overcome the defects of ferrite magnets, such as low coercive force and low residual flux density. As a result, the multi-layer rotor configuration with ferrite magnet was adopted to permanent magnet synchronous machine. Moreover, considering the output torque is predominantly the reluctance torque, the multi-layer rotor configuration with ferrite magnet PMSM is also called permanent magnet assisted synchronous reluctance machine (PMASynRM).
Due to there are many finite element analysis (FEA) models use in development process, the FEA model verification was performed before the design process begin. The FEA model verification was performed by examine and analysis a well-known ISG which was constructed by H-company. Therefore by comparing the results data difference between test and analysis, we can ascertain the validity of FEA model creating process.
This report presents a systematic exploration of the PMASynRM in FEA for the influence of rotor geometric design on the torque, speed, power stress, demagnetization, losses and efficiency properties. To be specific, this thesis proposed a design with permanent magnet being embedded in the double layer V-shape flux barrier compared to the original PMSM, which is a rare earth permanent magnet machine with same outer diameter and same electric power. The comparisons of the torque composition, terminal voltage at rated output, no-load back EMF, no load air gap flux density are given. The results of the machine performance comparisons are based on comprehensive use of finite element analysis tools (JMAG-Designer).
From the FEA results, it shows that the PMASynRM with double layer V-shape configuration can have similar mechanical output performances. Although the overall volume and weight of PMASynRM is larger than original PMSM, it will still be a better candidate if the defects of rare earth material weighed.
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