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RISS 인기검색어
- 검색키워드
- 저자 : M. Ohto (검색결과 4 건)
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Encoderless Servo Drive with Adequately Designed IPMSM for Saliency-based Position Detection
K. Ide,M. Hisatsune,T. Shiota,S. Murakami,M. Ohto 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
This paper presents a newly developed encoderless servo drive with an adequately designed interior permanent magnet synchronous motor (IPMSM). The motor for encoderless servo drive is designed to act like resolver incorporated with saliency-based position detection technique. The resolution of the position detection and sustainability against load are considered in the design. As the position detection a pulse voltage injection technique is employed to realize higher dynamics in the control performance than conventional technique. This paper mainly focuses on the technology fusion in between motor design and control design. Finally, the fast initial pole positioning, the high-dynamics performance in position and speed control, which are sufficient for servo drive applications, are shown in this paper. The net-resolution of the position detection is about 10 bits, and the accuracy of positioning is less than 1 mechanical degree in position control at steady state.
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Encoderless Motor Design for Servo Drive Applications
S. Murakami,M. Ohto,M. Hisatsune,T. Shiota,K. Ide 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
Improvement of output power of encoderless motor is desired in servo drive applications. However, as load on the encoderless motor increases, high frequency inductance distribution distorts so heavily that rotor position estimation becomes very difficult, which is a major technical problem hindering the improvement. This paper deals with a motor design aiming for high output power encoderless motor with concentrated winding and IPM configuration. First, reduction of armature reaction is referred to as the fundamental design concept. Next, a motor configuration realizing the concept is proposed. Then, motor design is conducted, and characteristics of a prototype motor is measured and evaluated. As a result, the prototype motor is verified to achieve basic servo motor performances and to have an almost sinusoidal high frequency inductance distribution feature without crucial distortion even when load increases. Output power of encoderless motor is enhanced by the design method presented in this paper.
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Jumina,Ifa Amalina,Sugeng Triono,Yehezkiel Steven Kurniawan,Yoga Priastomo,Keisuke Ohto,Bohari M. Yamin 대한화학회 2021 Bulletin of the Korean Chemical Society Vol.42 No.3
At present, biodiesel remains an untapped fuel source while crude oil reserves are being depleted. Extensive efforts are necessary to achieve efficient biodiesel production, but catalytic activity in methyl palmitate production remains unsatisfactory. In this study, we report the synthesis and organocatalyst activity of C-arylcalix[4]-2-methylresorcinarene sulfonic acids for biodiesel production. The presence of a methyl group on an aromatic ring is expected to disturb the intramolecular hydrogen bonds; thus, each hydroxyl group could be utilized for the catalytic process. C-arylcalix[4]-2-methylresorcinarene sulfonic acids were prepared from cyclocondensation and sulfonation reactions yielding compounds 1?6 at rates of 66.7%?86.6%. By evaluating the organocatalytic activity of the C-arylcalix[4]-2-methylresorcinarene sulfonic acids, we found that 4?mol% of compound 5 exhibited the highest yield (97.8%) of methyl palmitate at 338?K for 6-h reaction time, which is remarkable. These findings show that C-arylcalix[4]-2-methylresorcinarene sulfonic acids are promising heterogeneous catalyst materials for biodiesel production.
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Some post-Wernerian coordination chemistry
Cho, J.H.,Harrowfield, J.,Kim, J.Y.,Kim, Y.,Lee, Y.H.,Ohto, K.,Thuery, P.,Won, M.S.,Woo, A. Pergamon Press 2013 Polyhedron Vol.52 No.-
The crystal structures of one inert and six labile metal ion complexes have been analysed as a means of illustrating the refinements that X-ray crystallography has brought to the understanding of coordination chemistry so profoundly influenced by Alfred Werner. Contemporary interest in various weak interactions evident from structural studies can be related to the Wernerian concepts of <<haupt→> and <<neben-valenz>>.
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