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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.
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.