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- 저자 : H.J. Liaw (검색결과 3 건)
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J.-H. Liaw,S.-M. Sue,C.-S. Tseng 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The aim of this paper is to propose a new integrated interior permanent magnet synchronous motor (IPMSM) drive to improve performances for the whole speed range. Conventionally, in the field-weakening operation of the IPMSM (or PMSM) drives, there are three common drawbacks, which are high copper loss, serious current chattering phenomena, and poor current transient performance. The proposed control strategy can achieve two different levels of variable dc-link voltage and near zero transient voltage dynamics simultaneously. Hence, it can achieve a new high-speed operation mode that is different from that of the conventional field-weakening control strategies. The merits of the proposed motor drive include achieving the maximum torque per ampere control in the full speed range and having more versatile selection for DC link voltage.
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W.J. Wei,S.D. Tze,H.C. Liaw 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
Three calcium aluminate (CA) powders were synthesized and added into Al2O3 for the preparation of ceramic-based composites by the processes, either dry-pressing (D), colloidal dispersion/filtration (SH), and hydration-gelation (H). The heat evolution, gelation and related hydration processes of the aluminates and the admixtures were investigated. Besides, the green and the sintering properties of the CaO*Al2O3(CA)-Al2O3 admixtures were measured and are reported. The effects of acetic acid and alcohol (retarding agents) on the hydration reaction of the hydrates were studied, and used for the control of the gelation process. The sintering results of the admixtures with CA indicated the formation of CA6 phase greatly influenced the densification rate and final porosity.
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Wen-Cheng J. Wei,H.J. Liaw 한양대학교 세라믹연구소 2005 Journal of Ceramic Processing Research Vol.6 No.3
This study used monocalcium aluminate (CaAl2O4, CA) to produce ceramic composites with duplex microstructures by hydration and gelation reactions of the aluminate, and compared the properties with those made by a die-pressing process with mixed powders. The microstructure of sintered bodies, the fracture strengths and toughness of the composites with and without thermal shock was characterized by different techniques. Experimental results show that the composites with the addition of CA resulted in the formation of CA6 (CaO*6Al2O3) platelets, so as to reveal two types of microstructures, either in a cluster of agglomerated platelets or with a uniform distribution of platelet CA6 grains. The former, which appeared as a duplex microstructure consisted of a dense matrix and distributed clusters of CA6 platelets, gave an improvement in toughness and thermal shock resistance. The toughness mechanisms of the samples with duplex microstructures are discussed.
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