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113 results on '"Hidaka, Yuki"'

9. Torque Improvement of Magnet-Assisted Wound Field Motor With Field Unit Type Rotor

Author

Hidaka, Yuki

Abstract

This article presents a novel magnet-assisted wound field motor with a field-unit-type rotor. In conventional magnet-assisted wound field motors, the rotor core cannot be placed on the q-axis to pass through the winding nozzle. Therefore, conventional motors cannot utilize reluctance torque, and arrangement of magnets is limited. In the proposed motor, the main rotor core and pole piece, on which the field winding is wound, are separate, and the field coil, bobbin, and pole piece are integrated to form field units, which are inserted into the main rotor core in the axial direction. This structure allows the core to be placed on the q-axis of the main rotor core, thereby achieving higher torque density than conventional motors. In this study, to verify the effectiveness of the proposed motor, its torque characteristics are compared with those of the conventional motor using finite element method. The numerical results show that the proposed magnet-assisted wound field motor achieved higher torque than that of conventional motors. Moreover, to validate the analysis results, experimental tests are conducted using prototype motor. By comparing the experimental and simulation results, the high torque density effect, which revealed by the numerical analysis, can be confirmed to be reasonable. In this article, the magnet-assisted wound field motor proposed in the previous study is referred to as the conventional motor, and the magnet-assisted wound field motor using the field unit structure is referred to as the proposed motor.

Published
2024
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23. Glucose levels between the anterior chamber of the eye and blood are correlated based on blood glucose dynamics

Author

Kurihara, Toshihide, primary, Lee, Deokho, additional, Shinojima, Ari, additional, Kinoshita, Taku, additional, Nishizaki, Saori, additional, Arita, Yoko, additional, Hidaka, Yuki, additional, Nishi, Yasuyo, additional, Shirakawa, Yoshinori, additional, Kimura, Sho, additional, Tsuneyoshi, Yukari, additional, Torii, Hidemasa, additional, Tsubota, Kazuo, additional, and Negishi, Kazuno, additional

Published
2021
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39. Structure and dynamics of room temperature ionic liquids with bromide anion: Results from 81Br NMR spectroscopy

Author

Endo, Takatsugu, Imanari, Mamoru, Hidaka, Yuki, Seki, Hiroko, Nishikawa, Keiko, and Sen, Sabyasachi

Subjects
ionic liquids, dynamics, quantum chemical calculations, structure, 81Br, NMR
Abstract

We report the results of a comprehensive 81Br NMR spectroscopic study of the structure and dynamics of two room temperature ionic liquids (RTILs), 1-butyl-3-methylimidazolium bromide ([C4mim]Br) and 1-butyl-2,3-dimethylimidazolium bromide ([C4C1mim]Br), in both liquid and crystalline states. NMR parameters in the gas phase are also simulated for stable ion pairs using quantum chemical calculations. The combination of 81Br spin-lattice and spin-spin relaxation measurements in the motionally narrowed region of the stable liquid state provides information on the correlation time of the translational motion of the cation. 81Br quadrupolar coupling constants (CQ) of the two RTILs were estimated to be 6.22 and 6.52 MHz in the crystalline state which were reduced by nearly 50% in the liquid state, although in the gas phase, the values are higher and span the range of 7-53 MHz depending on ion pair structure. The CQ can be correlated with the distance between the cation-anion pairs in all the three states. The 81Br CQ values of the bromide anion in the liquid state indicate the presence of some structural order in these RTILs, the degree of which decreases with increasing temperature. On the other hand, the ionicity of these RTILs is estimated from the combined knowledge of the isotropic chemical shift and the appropriate mean energy of the excited state. [C4C1mim]Br has higher ionicity than [C4mim]Br in the gas phase, while the situation is reverse for the liquid and the crystalline states. Copyright © 2015 John Wiley & Sons, Ltd.

Published
2015

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