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
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136 巻, 7 号
選択された号の論文の23件中1～23を表示しています
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特集：家電・民生技術
特集論文
論文
  • 磁界共振結合方式の無線充電システムにおけるセンシング機能の広域化手法の提案
    並木 政人, 中村 壮亮, 橋本 秀紀
    2016 年 136 巻 7 号 p. 485-493
    発行日: 2016/07/01
    公開日: 2016/07/01
    DOIhttps://doi.org/10.1541/ieejias.136.485
    ジャーナル フリー
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    Recently, wireless charging via magnetic resonance coupling has gained attention because it has the potential of efficient midrange wireless charging. Here, functions such as sensing at the transmitter and wireless communication from the target are the essential elements to realize a standard wireless charging system. Currently, the sensing and communication protocol of the hardware (i.e., the high-frequency power source and antenna configuration) compatible with wireless charging is gaining attention in terms of its cost and space reduction due to the use of common components for multiple functions. However, this protocol has the problem of narrow effective areas due to the fact that the sensing range depends on the fixed Q factor of the antenna. To overcome this problem, the concept of wide-area sensing based on a Q controllable antenna is proposed, and the effectiveness is verified through a theoretical analysis and an experiment. As a result, it is clarified that the effective area can be expanded up to a ratio of the distance g between the transmitting and receiving antennas to the inner diameter d of the antenna g/d =5.0.
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  • 3次元折り曲げ鉄心を用いた永久磁石モータの基礎検討
    吉川 祐一, 小川 登史, 岡田 幸弘, 村上 浩, 森本 茂雄
    2016 年 136 巻 7 号 p. 494-500
    発行日: 2016/07/01
    公開日: 2016/07/01
    DOIhttps://doi.org/10.1541/ieejias.136.494
    ジャーナル フリー
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    In this paper, to provide a reduction in the size and weight of a motor, improvements in the torque density by the use of a three-dimensional bent core were examined. A motor using a three-dimensional bent core can collect flux leakage. The torque density could be improved by 10% by effectively using the magnetic flux. As a result, reductions in the size and weight of the motor are possible, and an increase in the performance of an automobile or a robot can be expected.
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  • 間欠運転による双方向絶縁形DC-DCコンバータの低出力領域の変換効率向上
    久持 裕史, 赤木 泰文, 木ノ内 伸一, 宮崎 裕二
    2016 年 136 巻 7 号 p. 501-508
    発行日: 2016/07/01
    公開日: 2016/07/01
    DOIhttps://doi.org/10.1541/ieejias.136.501
    ジャーナル フリー
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    This paper describes a 750-Vdc, 100-kW, 20-kHz bidirectional isolated dual-active-bridge (DAB) dc-dc converter using SiC-MOSFET modules without free-wheeling diodes, focusing on the output voltage ripple and power conversion efficiency. Intermittent operation brings higher conversion efficiencies in a low-power range to the dc-dc converter than does continuous operation because it makes a significant contribution to reducing switching (snubber) and iron losses. Experimental results reveal that the efficiency at 10kW (10% of the rated power) is 95.1% in continuous operation, whereas it is improved to 98.2% in intermittent operation. The combination of intermittent operation with continuous operation makes the efficiencies in a power range from 3 to 100kW higher than 98%, excluding power losses produced by the control and gate-drive circuits. However, the intermittent operation may bring additional voltage ripples to the dc output terminals. Theoretical analysis confirms that the voltage ripples in a power range from 1 to 18kW are lower than 7V in peak-to-peak, which is only 0.9% of 750Vdc. Theoretical results are confirmed by comparison to simulated and experimental ones.
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