電気学会論文誌D(産業応用部門誌)
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
134 巻 , 3 号
選択された号の論文の32件中1~32を表示しています
特集:産業計測自動制御,メカトロニクス制御
特集論文
論文
  • 石垣 卓也, 叶田 玲彦, 大橋 敬典, 渡部 與久, 杉浦 正樹
    2014 年 134 巻 3 号 p. 344-349
    発行日: 2014/03/01
    公開日: 2014/03/01
    ジャーナル 認証あり
    In this study, a new control method for the power supply of a mass motor is proposed. The reference voltage of the power supply is calculated digitally according to the energy conservation law. Specifically, this method takes into account a servo motor's rotational energy to control the output voltage by inputting an angular velocity to the digital controller. With this method, the voltage ripple of the power supply output is calculated to be reduced by about 40% compared conventional method. This also facilitates the reduction of the output capacitance and peak current and extension of the operating life.
  • 大槻 雅文, 宮木 勇, 中村 明生
    2014 年 134 巻 3 号 p. 350-362
    発行日: 2014/03/01
    公開日: 2014/03/01
    ジャーナル 認証あり
    This paper proposes a person search system that uses clothing features. The system uses a camera to obtain the appearance of a person and a range sensor for person detection and direction estimation. The system detects a moving person based on background subtraction using distance information and histogram of oriented gradients (HOG) features. The clothing area is extracted according to the positions of the person's shoulders and waist. The clothes are characterized by four features that are calculated from the color histogram, color differences, frequency, and co-occurrence matrix. The system recognizes the same clothing based on the degree of similarity, which is obtained by comparing clothing features. However, two problems can be assumed: (1) the clothing appearance differs depending on the body direction and (2) the clothing color changes depending on the illumination. For the former problem, we prepared three databases (front/side/rear views) corresponding to the person direction. The system estimates the direction of the person by using information of the body arc based on ellipse fitting. The direction is determined as perpendicular to the long axis of the ellipse fitted to the cross-section of body. Concerning the latter problem, we calibrated the color information to correspond to the environment. The method recognizes clothes by selecting the database provided for the direction of the person; the results showed that it was robust at identifying specific persons.
  • 牧田 真治, 高橋 英介, 梨木 政行, 道木 慎二
    2014 年 134 巻 3 号 p. 363-369
    発行日: 2014/03/01
    公開日: 2014/03/01
    ジャーナル 認証あり
    This paper presents a new motor with three three-dimensional magnetic cores and two loop windings driven by a normal three-phase inverter. This configuration reduces the number of parts, simplifies the production process, and downsizes the motor by a high copper slot fill factor and no end winding. This paper describes the working principle, the design approach, and the prototype evaluation results of the motor.
  • 山中 智裕, 藤田 到, 金子 裕良, 阿部 茂, 保田 富夫
    2014 年 134 巻 3 号 p. 370-375
    発行日: 2014/03/01
    公開日: 2014/03/01
    ジャーナル 認証あり
    Contactless power transfer systems for charging electric vehicles require a high efficiency, a large air gap, and a good tolerance to lateral misalignment and need to be compact and lightweight. Contactless power transformers have two types of structures: a single-sided transformer with a circular core and a double-sided transformer with a rectangular core. Past studies showed that H-shaped rectangular core transformers are more suitable for vehicles than circular core transformers.
    However, the cooling of cores located between two magnetic poles is a major challenge for double-sided transformers. In particular, this problem is serious for large capacity transformers such as fast chargers because the loss density is higher than for normal charge transformers. If the radiator interrupts the magnetic flux, not only are eddy current losses created but a coupling is also prevented.
    This paper proposes a novel cooling structure based on H-shaped core transformers. In the novel structure, radiator metal bars are inserted parallel to the main magnetic flux. As a result, the cooling performance is improved without compromising efficiency.
 
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