日本AEM学会誌
Online ISSN : 2187-9257
Print ISSN : 0919-4452
ISSN-L : 0919-4452
22 巻 , 3 号
選択された号の論文の13件中1~13を表示しています
特集 環境発電
特集Ⅱ 第22回MAGDAコンファレンス(MAGDAコンファレンス2013 in 宮崎)
  • 松田 健一, 平根 龍也, 近藤 良, 増澤 徹
    2014 年 22 巻 3 号 p. 386-392
    発行日: 2014年
    公開日: 2014/10/15
    ジャーナル フリー
    A 5-DOF self-bearing motor has been proposed for achieving a compact active magnetic bearing (AMB) system. The 5-DOF self-bearing motor possesses the functions of a motor, two radial AMBs, and an axial AMB. Therefore, it is possible to downsize the AMB system while maintaining its high performance. In this paper, a downsized outer rotor type 5-DOF self-bearing motor is proposed for the application to an artificial heart pump. An experimental setup was fabricated based on the analytical results obtained by a three-dimensional finite element analysis and was then tested. The proposed outer rotor type 5-DOF self-bearing motor proves to have a sufficiently applicable performance for use as an artificial heart pump.
  • 小笠原 崇人, 岡 茂八郎, 榎園 正人
    2014 年 22 巻 3 号 p. 393-398
    発行日: 2014年
    公開日: 2014/10/15
    ジャーナル フリー
    Experts now know that past iron loss measuring methods cannot quantitatively evaluate iron loss in an actual stator core with a complex shape. As such, we are researching a new method to measure the iron loss and magnetic properties of an actual stator core. We have already proposed a stator winding excitation method (SWEM), which can directly evaluate the iron loss of an actual stator core with a complex shape using a rotating machine to observe the magnetic flux which passes through each tooth. In this method, stator windings were used to generate the excitation magnetic flux in the stator core. In this study we will, report on the evaluation results of the magnetic properties for an actual stator core under conditions in which compressive stress is applied to a stator core. In order to reproduce stress in the manufacturing process, we used a two-axis external stress application device. We measured the magnetic properties in an actual stator core using the proposed method and device. Consequently, the magnetic properties of the actual stator core were affected in an obvious manner by the compressive stress.
  • 伊藤 桂一, 小松 薫, 宮田 克正, 五十嵐 一
    2014 年 22 巻 3 号 p. 399-404
    発行日: 2014年
    公開日: 2014/10/15
    ジャーナル フリー
    The impedance matching is an important technique for the improvement of the transmission efficiency of the waveguide slot array antenna with the dielectric lenses. We apply the electromagnetic field analysis technique to the impedance matching method by inserting the tuning screw into the waveguide wall. To reduce the VSWR over the frequency band, the optimization method of the tuning screw by the μGA is proposed. The objective function of the μGA is calculated by the FDTD method. From the calculation results, the VSWR in the frequency range from 11.8 to 12.2 GHz is improved by optimizing the screw parameters. The antenna matching by the μGA shows good performance as compared with that by the conventional method. Also, the validity of the proposed method is confirmed by the measurement result.
連載「電磁気学入門」
論文
  • 大嶋 和彦, 安藤 充宏, 小暮 俊介, 田中 裕幸
    2014 年 22 巻 3 号 p. 413-418
    発行日: 2014年
    公開日: 2014/10/15
    ジャーナル フリー
    It's possible to measure static load using piezoelectric film by sticking 2 sheets of identical films together. When one of the films is oscillated at its resonant frequency, the other film generates voltage by following up to the motion of the actuator film. The vibration of the body is suppressed due to the impressed load, and then the sensor voltage drops according to the magnitude of the load. Vibration analysis proved that the configuration of the vibration of the sensor body is not bending but in-plane expansion and contraction. It's also turned out that the characteristics of the sensor voltage are dominated not by the magnitude of the load but by the contact area of the load with the film. Therefore introducing the lamination material, which alters the contact area according to the magnitude of the load, will improve the sensitivity and the linearity of the sensor voltage to the load.
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