Accès ouvert
2026
article
OpenAlex
Tsukasa Ohba, Eimi Kikuchi, Akira Chibá, Arata Murayama et autres
We investigate the magma plumbing system of the 2.8-ka Saruana Lava at Chokai volcano, northern Honshu, based on mineral chemistry and textures. The Saruana Lava is a 0.6 km 3 basaltic andesite containing mafic enclaves with porphyritic and equigranular textures. Whole-rock compositions …
jp
(code pays fourni par la source)
2025
article
OpenAlex
Akira Chibá
This is a review paper of researches and developments of bearingless motors. The early developments are included. In addition, some notable researches and developments are presented. Basic permeance analysis, mathematical representations, basic controller structure, generalized DC type, induction type, permanent magnet type, …
jp
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Tsukasa Ohba, Akira Chibá, Arata Murayama
Abstract The structure and evolution of the magma plumbing system that produced the dacitic Yukiura Pumice (YP) at Iwate volcano, northern Honshu, are constrained by petrography and rhyolite–MELTS simulations. The basaltic Yukiura Scoria (YS) eruption immediately preceded YP, marking a bimodal shift …
jp
(code pays fourni par la source)
2025
conference-paper
OpenAlex
Guanghui Yang, Yiming Shen, Jiahao Chen, You Jie Zhou et autres
In traditional bearingless slice permanent magnet (PM) motors, achieving a replaceable rotor structure typically involves using a stator PM configuration. However, the dc-biased flux component can lead to magnetic saturation, decreasing the suspension force density. This paper proposes a novel bearingless slice …
cn, sg, jp
(code pays fourni par la source)
2025
conference-paper
OpenAlex
Diksha Singh, Akira Chibá
In this paper, a basic design process and FEM analysis results are presented for 800kW bearingless motor unit. The bearingless motor has a consequent-pole rotor with four iron poles and four permanent magnet poles. The suspension winding structure, stator tooth structure, stator …
jp
(code pays fourni par la source)
2025
conference-paper
OpenAlex
Yukio Tsutsui, Akira Chibá, Kyohei Kiyota, Yusuke Fujii et autres
Magnetic Worm-Geared Motor (MWGM) is a novel low-speed high-torque motor with an integrated magnetic worm gear for high torque density. The basic structure has been previously proposed by the authors. In the previous study, it was shown that introducing a half skew …
jp
(code pays fourni par la source)
2025
conference-paper
OpenAlex
Wenyi Xu, Kyohei Kiyota, Akira Chibá, Junichi Deguchi
Although higher motor speeds result in downsizing, there are concerns about the potential degradation of torque and efficiency due to a rapid increase in frequency-dependent AC copper loss. The conventional conductor configuration results in significant copper loss, which can be attributed to …
jp
(code pays fourni par la source)
Accès ouvert
2025
article
OpenAlex
Fares S. El-Faouri, Yifei Cai, Kyohei Kiyota, Naoki Saikawa et autres
In this paper, radial-force shaping using the logistic function is proposed for acoustic noise reduction in switched reluctance motors. The proposed radial-force shaping regulates the radial force on each stator tooth to track a logistic function with respect to rotor position. The …
jp
(code pays fourni par la source)
2025
article
OpenAlex
Guanghui Yang, Jiahao Chen, Yiming Shen, You Jie Zhou et autres
This article proposes a stator-inset-permanent magnet (PM) bearingless slice motor, which is capable of producing a constant directional force with direct suspension current regardless of the rotor’s angular position. The motor allows for flexible combinations of stator tooth and PM/rotor pole pair …
cn, sg, jp
(code pays fourni par la source)
2025
other
OpenAlex
Rika Kizawa, Genki Kanagawa, Aya Mukai, Daiki Hokkoku et autres
In Japan, the ageing population is progressing rapidly, leading to an increase in the number of elderly cancer patients. These patients often have multiple chronic diseases, and cognitive decline can impact their physical symptoms, decision-making abilities, adherence to treatment, and management of …
jp
(code pays fourni par la source)
2025
article
OpenAlex
Yifei Cai, Fares S. El-Faouri, Naoki Saikawa, Akira Chibá et autres
The contribution of magnetostriction to vibration and acoustic noise in switched reluctance motors is investigated through finite element analysis and experiment on two motors. One motor was constructed using the 6.5% high-silicon steel 10JNEX900 with a low magnetostriction (0.3 ppm at 1 …
jp, jo
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Accès ouvert
2025
article
OpenAlex
Yifei Cai, Fares S. El-Faouri, Akira Chibá, Souichiro Yoshizaki
Magnetostriction and electromagnetic force are the two electromagnetic sources of motor vibration. Understanding the phases of the vibrations caused by these two factors is crucial for determining whether they interact to amplify or mitigate total vibration. This study focuses on the experimental …
jp
(code pays fourni par la source)