研究者詳細 - 山口　大介

講演・口頭発表等 - 山口　大介

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2枚の成型したポリイミドフィルムから構成される空圧アクチュエータの試作

田浦魁晟, 山口大介, 石野裕二, 髙﨑正也, 水野毅

2020年度精密工学会春季大会学術講演会

超音波振動子と対向子を用いたポンプの液体への適用

山本翔也, 胡永亮, 髙﨑正也, 山口大介, 石野裕二, 水野毅

2020年度精密工学会春季大会学術講演会

金型を必要としないポリイミドフィルム同士の溶着とバルーンの試作

加藤陽祐, 山口大介, 石野裕二, 髙﨑正也, 水野毅

2020年度精密工学会春季大会学術講演会

超小型探査機 OMOTENASHI 用ポリイミド製エアバッグ気室の開発

石野裕二, 山口大介, 大槻真嗣, 高橋洋介, 佐藤亮, 髙﨑正也, 水野毅

第16回「運動と振動の制御」シンポジウム (MoViC2019)

真空圧を利用したポリイミドフィルム製可変剛性要素の試作

野田拓希, 山口大介, 石野裕二, 高崎正也, 水野毅

第16回「運動と振動の制御」シンポジウム (MoViC2019)

隔壁磁気浮上システムの開発第１報直列二重磁気浮上の適用

水垂宏介, 水野毅, 石野裕二, 髙崎正也, 山口大介

第16回「運動と振動の制御」シンポジウム (MoViC2019)

側配置型磁路制御式磁気浮上機構の小型化に関する研究 (第 1 報：回転式磁路制御機構の提案)

黒澤繁範, 水野毅, 石野裕二, 山口大介, 高崎正也

第16回「運動と振動の制御」シンポジウム (MoViC2019)

Realization of zero-power control in a two-degree-of-freedom double parallel magnetic suspension system

Y. Narisawa, T. Mizuno, M. Takasaki, Y. Ishino, M. Hara, D. Yamaguchi

2017 Asian Control Conference, ASCC 2017 2018年2月7日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2018年2月7日

記述言語：英語

A basic single-degree-of-freedom magnetic suspension system consists of one floator, one electromagnet and one amplifier. For multi-degree-of-freedom control, multiple electromagnets and multiple amplifiers are necessary, which increases the cost of total system. As a means of overcoming this problem, parallel magnetic suspension has been proposed which controls multiple floators or multi-degree-of-freedom motions with a single power amplifier. This paper focuses on the zero-power control in a two-degree-of-freedom double parallel magnetic suspension system. The steady-state characteristics of this system are clarified by theoretical analysis. When the disturbance acts on one of the suspended points, a steady displacement appears only in the corresponding suspended point. The direction of the steady displacement is opposite to the direction of the disturbance. In addition, the direction of the transient response depends on the point that the disturbance acts on. In experimental apparatus, step response and frequency response are measured to verify the predictions.

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Resonance frequency tracking control of ultrasonic transducer for diminished haptics

Masaya Takasaki, Daisuke Yamaguchi, Masayuki Hara, Yuji Ishino, Takeshi Mizuno

2017 Asian Control Conference, ASCC 2017 2018年2月7日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2018年2月7日

記述言語：英語

Previously, 'diminished haptics' in which real surface texture can be transformed was proposed. Strong intensity ultrasonic vibration was applied to realize demonstration of the concept. To enjoy the demonstration, the intensity of the ultrasonic vibration on solid surface should be maintained. The ultrasonic transducer fabricated for this purpose consisted of a Langevin type ultrasonic transducer and a horn whose end was shaped in square. Large vibration amplitude can be acquired at resonance of the whole transducer as longitudinal vibration mode. On the other hand, resonant frequency easily changes due to operating conditions. To keep the amplitude, the resonant frequency should be tracked by real time. Tracking control with phase detection was applied with a newly developed control system. Step responses of oscillating frequency as results of tracking control are reported. The results show successful tracking control.

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Zero-power control of flux-path control magnetic suspension system with flux-interrupting plates

T. Mizuno, M. Takasaki, M. Hara, D. Yamaguchi, Y. Ishino

LDIA 2017 - 11th International Symposium on Linear Drives for Industry Applications 2017年11月3日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2017年11月3日

記述言語：英語

The feasibility of zero-power control in flux-path control magnetic suspension is discussed. In the flux-path control magnetic suspension system, ferromagnetic control plates are inserted between a permanent magnet (magnetic source) and a floator and moved to vary the flux from the magnetic source to the floator. The zero-power control has been applied in active magnetic suspension with a DC electromagnet. In the zero-power controlled system, the control current was kept virtually zero in the steady states. The applicability of the zero-power control to the flux-path control magnetic suspension is discussed in this paper. The conditions required to achieve the zero-power control is presented in an analytical form. Experiments are carried in a fabricated apparatus to certify the theoretical predictions.

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Precise positioning characteristics of multi-mode ultrasonic motor

Masaya Tkasaki, Zhang Shuo, Masayuki Hara, Daisuke Yamaguchi, Yuji Ishino, Takeshi Mizuno

2015 IEEE International Ultrasonics Symposium, IUS 2015 2015年11月13日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2015年11月13日

記述言語：英語

Previously developed multi-mode ultrasonic motor has three driving modes, which are fast driving mode with figure-of-eight locus resonant vibration, impact driving with saw tooth wave form and DC voltage driving mode. The impact driving mode can be divided into two categories. One utilized resonant vibration (fast) and the other uses individual off resonance vibration (slow). For precise positioning, characteristics of stable driving of the slow impact driving mode and stroke of the DC mode are important. This paper reports the characteristics obtained through experiments.

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Comparison of zero-power controllers in double parallel magnetic suspension system with parallel connected coils

Yoshinori Narisawa, Daisuke Yamaguchi, Masayuki Hara, Masaya Takasaki, Takeshi Mizuno, Yuji Ishino

2015 10th Asian Control Conference: Emerging Control Techniques for a Sustainable World, ASCC 2015 2015年9月8日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2015年9月8日

記述言語：英語

A basic single-degree-of-freedom magnetic suspension system consists of one floator, one electromagnet and one amplifier. For multi-degrees-of-freedom control, multiple electromagnets and multiple amplifiers are necessary, which increases the cost of total system. As a means of overcoming this problem, parallel magnetic suspension has been proposed where multiple floators are controlled with a single power amplifier. Parallel magnetic suspension systems are classified into two types according to the output of the power amplifier: current-controlled and voltage-controlled. Voltage-controlled parallel magnetic suspension systems are classified into two types: series connected and parallel connected. The feasibilities of these systems have been already demonstrated in the previous work. This paper focuses on the voltage-controlled parallel magnetic suspension system with parallel-connected coils. Three approaches to zero-power control are applicable in such a system. This paper compares these approaches in a viewpoint of pole assignment. In addition, a relationship in the feedback gains between the three approaches are presented numerically.

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Development of non-contact carrier system using solar magnetic suspension (3ed report: Continuous 5-day and installation of sloping propulsion mechanism)

Yuji Ishino, Masaya Takasaki, Daisuke Yamaguchi, Takeshi Mizuno, Masayuki Hara

2015 10th Asian Control Conference: Emerging Control Techniques for a Sustainable World, ASCC 2015 2015年9月8日 Institute of Electrical and Electronics Engineers Inc.

開催年月日： 2015年9月8日

記述言語：英語

A solar-powered magnetic suspension carrier system is developed in which the carrier is powered without contact. There are two conventional methods of powering the coils of the magnetic suspension carrier: (i) through wire, (ii) onboard battery (wireless) power supply. The contactless is lost in the former while stations for charging the battery are necessary in the latter. These problems are overcome by the proposed carrier system using solar magnetic suspension that can attain continuous levitation. The magnetic suspension carrier is assumed to operate inside rooms like inside a factory building. Because the generation power by solar cells is small, power saving us acritical requirement. Therefore, the zero power control is applied for suspension. In addition, low-power peripheral devices are fabricated. The developed carrier system achieved a five-day levitation without external power supply in a bright environment. In addition, a sloping propulsion mechanism was introduced. The mechanism consists of a track rail and two pillars with actuators to move up and down the track rail. The carrier slides and moves to the lower direction due to gravity below a sloped rail.

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Ultrasonic motor for sample spinning of solid-state nuclear magnetic resonance spectrometer in high magnetic field

Daisuke Yamaguchi, Dai Takeda, Takefumi Kanda, Koichi Suzumori

IEEE International Ultrasonics Symposium, IUS 2014年10月20日 IEEE Computer Society

開催年月日： 2014年10月20日

記述言語：英語

The aim of this paper is to realize a new sample spinning unit for a solid-state nuclear magnetic resonance (NMR). In the solid-state NMR analysis, a sample spinning in high magnetic field is an important function. We have designed and fabricated the sample spinning unit using a low-profile ultrasonic motor for high magnetic field. The unit could be driven in high magnetic flux at 9.4 T. Soli-state NMR analysis of glycine was measured using the unit. We have succeeded in applying the ultrasonic motor for solid-state NMR analysis.

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Evaluation of thermal stress of transducers for cryogenic ultrasonic motors

Yuya Noguchi, Daisuke Yamaguchi, Takefumi Kanda, Koichi Suzumori

IEEE International Ultrasonics Symposium, IUS 2014年10月20日 IEEE Computer Society

開催年月日： 2014年10月20日

記述言語：英語

An ultrasonic motor which can be driven at the condition from room temperature to cryogenic temperature has been designed, fabricated and evaluated. This motor has a bolt-clamped Langevin-type transducer which is suitable for cryogenic temperature. The aim of this paper is to evaluate the thermal stress of transducers. Each transducer is made of materials which had different thermal expansion coefficient, such as stainless, Ti, or invar. The thermal stress in the transducer made of Ti was the smallest. The rotation speed of the motor using the transducer made of Ti was evaluated at cryogenic temperature. The rotation speed was 1102 rpm at 4.6 K when the applied voltage was 100 V&lt
inf&gt
p-p&lt
/inf&gt
.

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Evaluation of piezoelctric materials for cryogenic ultrasonic motor

Daisuke Yamaguchi, Takefumi Kanda, Koichi Suzumori

IEEE International Ultrasonics Symposium, IUS 2013年

開催年月日： 2013年

記述言語：英語

This paper presents a fabrication and evaluation of an ultrasonic motor which can drive in an ultralow temperature environment. A piezoelectric performance of ferroelectric materials was evaluated at ultralow temperature. To measure the piezoelectric constant d31 of PMN-PT and PZT at ultralow temperature, the resonance-antiresonance method was applied. The d31 of the PMN-PT was higher than that of PZT at 4.5 K. Additionally, we have fabricated and evaluated an ultrasonic motor that have a bolt-clamped Langevin-type transducer. The performance of the transducer and the efficiency of the motor had similar decreasing tendency with driving temperature. © 2013 IEEE.

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極低温流域におけるPMN-PT単結晶と超音波モータの温度特性の評価

山口大介, 神田岳文, 鈴森康一, 野口祐也

超音波エレクトロニクスの基礎と応用に関するシンポジウム講演論文集 2012年11月13日超音波エレクトロニクスの基礎と応用に関するシンポジウム運営委員会

極低温環境での使用を目的とした超音波モータへのPMN‐PT単結晶の応用

山口大介, 神田岳文, 鈴森康一, 黒田雅貴, 武田大

電磁力関連のダイナミックスシンポジウム講演論文集 2012年5月16日

磁気浮上系のリセット要素による安定化第3報積分補償器との併用

石野裕二, 水野毅, 高崎正也, 山口大介

第62回自動制御連合講演会 2019年11月10日

磁路制御式磁気浮上の大ギャップ化に関する研究（第5報：浮上体の多自由度マニピュレーション）

水野毅, 石橋尚宜, 石野裕二, 高崎正也, 山口大介

第62回自動制御連合講演会 2019年11月10日

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講演・口頭発表等 - 山口 大介

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