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독립 3상 구조를 갖는 이중공극형 영구자석 동기전동기의 Y 및 Delta 결선에 따른 공극제어
허찬녕(Chan-Nyeong Heo),황선환(Seon-Hwan Hwang) 전력전자학회 2017 전력전자학회 논문지 Vol.22 No.3
This paper presents air-gap control according to Y and Delta connections of a double-sided air-gap permanent magnet synchronous motor (DA-PMSM) with independent three-phase structure. In particular, the DA-PMSM used in this study can be applied to low-speed and high-torque applications, such as wind turbines, tidal power generations, and electric propulsion ships, because of its modular stators and a rotor with numerous permanent magnets. Unlike conventional three-phase machines, the DA-PMSM has a symmetrical configuration with double-sided air-gap. Therefore, Y/Delta winding connections and serial/parallel configurations between stator modules are possible. To identify the DA-PMSM operating characteristics, mathematical modeling is analyzed according to the Y/Delta connections. Moreover, air-gap control performances by applying the winding connection methods are verified through experimental results.
역기전력 불평형을 고려한 독립 3상 영구자석 동기전동기의 속도맥동 저감
허찬녕(Chan-Nyeong Heo),황선환(Seon-Hwan Hwang) 한국조명·전기설비학회 2016 조명·전기설비학회논문지 Vol.30 No.11
This paper proposes a speed ripple reduction method of independent three-phase permanent magnet synchronous motor(IT-PMSM) considering unbalanced back-EMFs. The IT-PMSM consists of modular stators and symmetrical rotors with numerous permanent magnets. This structure has some advantages such as maintenance cost reduction, simple manufacturing and transportation. However, the module-based structures cause unbalanced back-EMFs due to non-uniform airgap, which can be happened during manufacturing and installation process. As a result, not only speed and dq axes current ripples but also torque ripple which contain at twice the output frequency appear during operation of the IT-PMSM. These ripple components can be reduced by the proposed PR controller, which reduces specific ripple component. In this paper, the effect of the unbalanced back-EMFs was analyzed by mathematical modeling. In addition, the two times speed and dq-axes current ripple components of synchronous frequency were decreased by the proposed PR controller. The effectiveness of the proposed PR controller was verified through experiments.