日本AEM学会誌
Online ISSN : 2187-9257
Print ISSN : 0919-4452
ISSN-L : 0919-4452
25 巻 , 2 号
特集 第25回MAGDAコンファレンス(MAGDA2016 in 桐生)
選択された号の論文の36件中1~36を表示しています
特集 第25回MAGDAコンファレンス(MAGDA2016 in桐生)
一般論文
  • 佐々木 幸太, 遊佐 訓孝, 片桐 拓也, 橋爪 秀利
    2017 年 25 巻 2 号 p. 266-272
    発行日: 2017年
    公開日: 2017/07/25
    ジャーナル フリー

    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.

  • 部矢 明, 平田 勝弘, 吉元 崇倫, 太田 智浩
    2017 年 25 巻 2 号 p. 273-278
    発行日: 2017年
    公開日: 2017/07/25
    ジャーナル フリー

    A lens-unit-swing system is composed of lens and an imaging device for image stabilizations. This system can correct an image from camera shakes over wide rotation ranges around three axes. On the other hand, this system has some problems such as an increase in size and power consumption. Therefore, three-degree-of-freedom actuators are expected to become a solution for these problems. However, it is difficult to incorporate these actuators in the system because the size is large and it has a complicated control system. In order to solve these problems, we propose a new three-degree-of-freedom electromagnetic actuator, which can be controlled by a simple control system. In this paper, the basic structure and operating principle of the actuator are described. Moreover, the modeling method of the actuator is described. In addition, the effectiveness of the actuator is verified through 3-D finite element analysis and numerical simulation.

  • 野中 剛, 平山 雅之, 大戸 基道
    2017 年 25 巻 2 号 p. 279-285
    発行日: 2017年
    公開日: 2017/07/25
    ジャーナル フリー

    In recent years, high rotational speed of IPM motors is required for applications like Electric Vehicle(EV). In case of rotors having same shape, maximum against centrifugal force is decided by the strength of rotor core. Therefore, it is possible to achieve higher rotational speed if higher strength steel plate, instead conventional silicon steel plate, is used. However, in case of higher strength steel plate, the efficiency of motor drops as iron loss increases due to the degradation of its electromagnetic characteristics.●br●This paper reports on the efficiency of a prototype IPM motor with rotor core that using high strength steel plates having a yield point over 3 times higher than the conventional silicon steel plates. The efficiency of the prototype IPM motor is also compared with a rotor core that uses conventional silicon steel plates. It is found that although there is small drop of motor efficiency, the prototype IPM motor achieved a maximum rotational speed which about 2times higher than that of the conventional core IPM motor.

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