著者

市川 将稔 千島 一輝 小池 義和

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.26, no.1, pp.139-144, 2018 (Released:2018-05-30)

参考文献数

13

被引用文献数

1

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Authors investigated whether the absolute sound pressure in the ultrasonic cleaning machine can be measured by fiber optic probe hydrophone (FOPH) under cavitation. Since the intensity on the cavitation bubble collapse is high in the frequency range of about 30 to 100 kHz, the sound pressure measurement using FOPH was applied to ultrasonic cleaning machine with the use of a submerged ultrasonic transducer with frequency of 35.5 kHz. In the case of cavitation bubble collapse occurs frequently, it is confirmed that fundamental and harmonic components can be measured by FOPH. And also, the sound pressure distribution was compared to the analysis result using finite element method.

著者

林屋,均

出版者

日本AEM学会

雑誌

日本AEM学会誌

巻号頁・発行日

vol.10, no.2, 2002-06-10

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Reversed field pinch (RFP) plasmas have been formed in a TS-3 device and an ohmic heating current drive was applied to support the plasma. In such condition, it was found that the direction of the toroidal field induced by the plasma current naturally inversed. A magnetic structure was finally formed like the spherical tokamak (ST) in which the direction of the toridal field induced by the plasma current is the same as the field generated by the external coil. To understand the dynamical change of the magnetic structure in this process, the toroidal field distributions, safety factor profiles and the profiles of plasma pressure are shown. All of these results indicate the transition phenomena of the magnetic structure from REP to low q ST. This phenomenon is also consistent with the latest report from another organization (Himeji Institute of Technology).

著者

榎園 正人

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.22, no.1, pp.33-40, 2014 (Released:2014-06-16)

著者

小原 章 平田 勝弘 新口 昇 高原 一晶

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.25, no.2, pp.125-130, 2017 (Released:2017-07-25)

参考文献数

13

---

We have proposed a current superimposition variable flux machine for traction motors. The torque-speed characteristics of this machine can be controlled by increasing or decreasing the DC current which is superimposed on the AC current. However, because of noises and the change of coil resistances, the DC current was difficult to apply constantly. In this paper, we propose a DC current control method and verify the effectiveness by carrying out measurements on a prototype. First, the structure and control method are described. Next, the effectiveness of the proposed method is verified by using FEA. Finally, the N-T characteristics are measured on a prototype.

著者

榎本 裕治 床井 博洋 今川 尊雄 鈴木 利文 小俣 剛 相馬 憲一

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.24, no.3, pp.258-263, 2016 (Released:2016-12-21)

参考文献数

13

被引用文献数

10

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This paper presents the development of high efficiency (IE5-class) industrial motor with an amorphous core for large capacity applications. Interest in saving energy increases on a global scale, and the high efficiency of the motor attracts attention. As for the motor of the field of industry, legal regulation to IEC standard is promoted in each country. We developed the magnetic characteristic evaluation technology and highly precise analysis design technique in the motor to reduce a loss more from the IE4 efficiency class. We found core structure to reduce the loss of the amorphous metal core, and the trial motor was able to achieve an efficiency class of IE5 by applying it.

著者

久保山 敬介 王 鋒 松本 浩樹 中沢 信明

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.21, no.2, pp.140-145, 2013 (Released:2014-02-25)

参考文献数

11

被引用文献数

1

---

This paper reports a novel system that real-timely detects the respiration and the heartbeat during sleep for the purpose of early diagnosis of Sleep Apnea Syndromes. Real-time discrimination of the signal components related to the respiration and the heartbeat was realized using the Independent Component Analysis from the observed signals of PVDF films, which are placed on the bed under the bed sheet. Body movement is taken into consideration in order to prevent the system from divergence and to improve the discrimination accuracy. Efficacy of the system is testified through experiments.

著者

大野 勇輝 新口 昇 平田 勝弘 森元 瑛樹

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.23, no.1, pp.23-28, 2015 (Released:2015-05-31)

参考文献数

17

被引用文献数

2 2

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We propose a novel magnetic gear with a high torque density and a huge gear ratio despite the small number of magnet poles. This magnetic gear combines a magnetic flux harmonics gear with a magnetic paradox planetary gear by replacing all planetary gears with steel pole pieces. Its structure and operating principle are described, and the effectiveness of the proposed gear is verified by 3-D finite element analysis.

著者

武居 直行

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.25, no.1, pp.24-27, 2017 (Released:2017-05-24)

参考文献数

20

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In this article, the author introduces two aquatic robots being developed in the author's laboratory: a miniature aquatic robot propelled by resonance of elastic plate and MINAMO (Multidirectional INtuitive Aquatic MObility). The former is a robot including a vibrating motor in the body shell and having an elastic plate fixed on the outer as a fin. The latter is a personal vehicle on water that realizes the straight and whirl movement by the control of the rider weight shifting.

著者

池俣 吉人 佐野 明人

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.25, no.1, pp.2-8, 2017 (Released:2017-05-24)

参考文献数

52

---

A passive walker can walk down shallow slope with no energy source other than gravity. This motion is very attractive because its gait is really natural and ideal. Moreover, the walker can exhibit a stable limit cycle. Dynamics of passive walking is very interesting target and important for understanding human locomotion and developing the biped robots. In this paper, we introduce principles and applications of passive walking.

著者

中川 将嘉 米盛 弘信

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.26, no.1, pp.89-94, 2018 (Released:2018-05-30)

参考文献数

7

---

This paper describes the effect of power supply noise on the acoustic noise and pan vibration when making use of the IH (Induction Heating) cooker. Recently, due to the spread of power electronics device, noise superimposed on the AC power supply is a problem. It has been reported that the acoustic noise provides discomfort feeling when using the IH cooker. Other studies have concluded that the vibration of a pan due to the induction heating is the noise source. So, we started our study on the noise from a pan when making use the IH cooker. Furthermore, we clarify the influence of power source noise on the acoustic noise and pan’s vibration. We made an experiment to clarify this influence. As a result, we clarified that power source noise has influenced acoustic noise and pan’s vibration.

著者

Koya YOSHIKAWA Wataru KITAGAWA Takaharu TAKESHITA Akihiro MASUDA Masahiro NAKASHIMA Akiko NAKATANI Hidenori NAKATANI

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.23, no.3, pp.474-479, 2015 (Released:2015-12-04)

参考文献数

8

被引用文献数

1 3

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This paper presents a new structure of bone conduction speaker. It is smaller than the conventional structure by removing an extra space. The magnetic path of this structure is not wasteful because the coil case is attached a cover and this structure uses the magnetic material as the vibrating plate. This structure operates by flowing the audio current into the voice coil. That reason is the change of magnetic attractive force between the magnetic pole of yoke and magnet. The authors revealed various characteristics of this structure by the electromagnetic field analysis and structural analysis by using the 3-dimensional finite element method (3D-FEM). As the result of electromagnetic analysis, the leakage flux of this structure is lower than the conventional structure by 55.2 %. As the result of structural analysis, the sound pressure level (SPL) of this structure is higher than the conventional structure by 12.6 %. Consequently, the performance of this structure is improved.

著者

山本 健一

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.26, no.3, pp.468-472, 2018

被引用文献数

1

---

<p> When compressive stress is applied to electrical steel sheets in their thickness direction, both permeability and magnetic losses change. The stress induced loss reduction was observed both ring and strip specimens, and they are mainly from hysteresis loss change due to the stress. Magnetizing process due to the stress is discussed by means of domain observations.</p>

著者

佐々木 幸太 遊佐 訓孝 片桐 拓也 橋爪 秀利

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.25, no.2, pp.266-272, 2017

被引用文献数

3

---

<p>This study proposes long-range nondestructive inspection of the inner surface of a pipe without open end using microwave emitted by a probe attached to the pipe wall. Three-dimensional finite element simulations were conducted to evaluate how to propagate microwave effectively inside a pipe having an inner diameter of 19 mm. The simulations considered a coaxial cable penetrating the pipe wall to emit microwave inside the pipe. Experimental verifications were then carried out using a brass pipe with a total length of 4.5 m and a probe fabricated on the basis of the results of the numerical simulations. The experiment confirmed clear reflections due to artificial wall thinning 1 m away from the probe situated approximately at the center of the pipe. The experiment also revealed that directivity of the microwave depended on the frequency, which agrees with the results of the numerical simulations.</p>

著者

中住 昭吾 鈴木 隆之

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.22, no.2, pp.120-125, 2014 (Released:2014-10-06)

参考文献数

9

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In this paper, a technique of magnetostatic field analysis for structural models with defect of arbitrary inclination angle is presented by adding a function obtained from conformal mapping to the approximate potential function based on the conventional FEM scheme. In this technique, geometry of the defect is not explicitly expressed on the orthogonal grid type FEM mesh but held as function within the analysis program. Since the change of the defect shape is reflected in that function, it becomes possible to use the original mesh without being changed. The magnetic flux density distribution around an inclined defect obtained by this presented technique showed good agreement with that from FEM analysis.

著者

村田 茂 森 晃 和多田 雅哉 平田 孝道 筒井 千尋 近藤 朱音 高橋 玄宇

出版者

The Japan Society of Applied Electromagnetics and Mechanics

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.21, no.2, pp.260-265, 2013 (Released:2014-02-25)

参考文献数

6

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Traditional ways of using plasma for medical application are blood coagulation and sterilization and etc. Recently, plasma has been used for medical treatment at Drexel University in USA. In their study, sever burn has been treated by using plasma irradiation. If plasma medicine is established, it is possible to start new regenerative medicine. They study therapies by using plasma irradiation, but the examination of safety for living body is not enough. Therefore, in this study, I investigate the effect of plasma irradiation treatment for the living body. The first step of my study, I report the changing of the Cardiovascular System by plasma inhalation.

著者

市川 直樹 鈴木 隆之

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.15, no.4, 2007-12-10

著者

菅野 勉

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.22, no.3, pp.348-353, 2014 (Released:2014-10-15)

参考文献数

5

---

This paper describes a basic concept of thermoelectric tubes. Construction of thermoelectric tubes has been done by making use of the off-diagonal thermoelectric effect, which is one of the direct energy conversion processes from heat into electricity. Here we also present a fabrication process and the current status of a feasibility study at a garbage incineration plant in Kyoto.

著者

中岡 將吉 高橋 則雄 河邊 盛男 中野 正典 藤原 耕二

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.11, no.3, pp.173-178, 2003-09-10

参考文献数

5

被引用文献数

4

著者

佐々木 実 武藤 光 安田 晴信 伊藤 聡

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.20, no.1, pp.256-261, 2012-03-10

著者

村上 岩範 小林 祐介 吉澤 明訓 安藤 嘉則 山田 功

出版者

日本AEM学会

雑誌

日本AEM学会誌 (ISSN:09194452)

巻号頁・発行日

vol.19, no.1, pp.33-40, 2011-03-10