研究等業績 - その他 - 吉田 征弘
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張 磊, 吉田 征弘, 櫻井 将, 半田 修士, 田島 克文
電気学会論文誌． Ａ ( 一般社団法人 電気学会 ) 144 ( 4 ) 139 - 144 2024年04月
<p>In recent years, due to the demand for miniaturization and weight reduction of magnetic devices such as in-vehicle drive motors, the authors have focused on miniaturization of the system through the fusion of devices. In this paper, we proposed an integrated motor structure combining a step-up reactor and a motor for a motor drive system using a step-up DC/DC converter. After confirming that the reactor and motor functioned independently, we calculated the characteristics when they operated simultaneously, and investigated the improvement of the motor torque characteristics by changing the structure of the reactor.</p>
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フェライト磁石を併用したセグメント構造アウターロータ型PMモータのトルク脈動低減に関する検討
櫻井 将, 吉田 征弘, 田島 克文
日本磁気学会論文特集号 ( 公益社団法人 日本磁気学会 ) advpub ( 0 ) 2024年
<p> Drones have been used for limited purposes such as aerial photography and pesticide spraying, but now they are expected to be used for logistics and transportation. On the other hand, the drones are operated for a short time about 40 to 60 minutes, and they have a low payload weight of less than 10 kg. To improve these, the battery capacity can be increased, but the weight is also increased and the payload weight is decreased. So, improvement of the motor is necessary. This paper presented a novel outer-rotor-type permanent magnet (PM) motor with a segment-shaped rotor for high power density and low cost. It can be used a magnet flux effectively because it has backyoke iron, and improving output can be expected. However, the torque ripple is increased. So, the improvement of torque ripple is proved using an asymmetry rotor and Ferrite magnet.</p>
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吉田 征弘, 木村 守, 栗田 直幸
電気学会誌 ( 一般社団法人 電気学会 ) 143 ( 11 ) 706 - 709 2023年11月
<p>1．はじめに</p><p>2015年にSDGs，パリ協定が採択されて以降，世界的に気候変動，地球温暖化防止への取り組みが強く求められており，我が国では2050年までにカーボンニュートラルの実現を目標とした電動化の動きが加速している。電動化におけるキーデバイスであるモータ，発電機，変圧器などの</p>
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ボンド磁石を用いた非対称磁極構造IPMモータの実機評価
塚田 裕太, 吉田 征弘, 半田 修士, 田島 克文
日本磁気学会論文特集号 ( 公益社団法人 日本磁気学会 ) 7 ( 1 ) 73 - 79 2023年05月
<p> This paper presents an investigation into the usefulness of a motor with an asymmetric pole structure based on a prototype rotor using samarium-iron-nitrogen bonded magnets. Comparing the torque characteristic of the proposed asymmetric-pole motor with that of a conventional motor using a neodymium sintered magnet, the maximum torque of the proposed motor increased by 12%. Furthermore, a comparison of efficiency characteristics showed that asymmetric motors have better efficiency characteristics than conventional motors in the high-load and low-speed ranges. It was found that an asymmetric rotor structure with a complicated magnet shape negatively affects the efficiency characteristics in the high-speed operating region.</p>
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RNAに基づく昇圧リアクトル機能を有するモータの出力特性算定に関する検討
張 磊, 吉田 征弘, 櫻井 将, 半田 修士, 田島 克文
日本磁気学会論文特集号 ( 公益社団法人 日本磁気学会 ) advpub ( 0 ) 52 - 56 2023年
<p> In recent years, due to the demand for miniaturization and weight reduction of magnetic devices such as in-vehicle drive motors, the authors have focused on miniaturizing motor drive systems through the fusion of devices. In this paper, we propose an integrated motor structure combining a step-up reactor and a motor for a motor drive system using a step-up DC/DC converter. Comparing the integrated structure of the proposed step-up reactor and motor with a conventional motor by reluctance network analysis (RNA), we find that the proposed model can improve output in the high-speed range.</p>
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Study on Injection Molding IPMSM Using Sm-Fe-N Bonded Magnet
Yoshida Y.
2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings ( 2023 IEEE International Magnetic Conference - Short Papers, INTERMAG Short Papers 2023 - Proceedings ) 2023-January 2023年
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アキシャルギャップ誘導モータの設計手法に関する検討
照井 智理, 吉田 征弘, 田島 克文
日本磁気学会論文特集号 ( 公益社団法人 日本磁気学会 ) 6 ( 1 ) 74 - 80 2022年05月 [査読有り]
<p> In this paper, we designed an axial gap induction motor with a synchronous speed of 6000 rpm and a power density of more than 1 kW/L for drones by applying the proportional increment method, which decides the allocation of electric loading and magnetic loading, to the axial gap induction motor. The designed motor was analyzed by reluctance network analysis (RNA), which has a proven to be a useful method for analyzing induction motors. It was confirmed that an axial gap induction motor with a rotational speed of 5850 rpm and a power density of 1.39 kW/L could be designed.</p>
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滝渕 広大, 吉田 征弘, 加茂 宗太, 高木 清嘉, 村岡 幹夫
年次大会 ( 一般社団法人 日本機械学会 ) 2019 ( 0 ) J04408P 2019年
<p>We work on a thermoforming technique of carbon-fiber reinforced thermoplastic (CFRTP) using induction heating, with commingled knit as intermediate material. Commingled knit has unidirectional carbon fiber, so even if an alternating magnetic field is applied, it does not generate heat by itself. In this study, induction heating by conducting the end of the commingled knit is used to heat the carbon fiber itself. In addition, commingled knit laminates are tested under the end-conduction assisted induction heating. The experiment showed that the temperature could be raised to the melting temperature of the thermoplastic resin only by the heat generation of the commingled knit. Furthermore, it showed that the heat generation efficiency is improved by laminating commingled knit. These results confirmed that, this technique is capable of forming only with heat generation of commingled knit, it can be expected to a low-cost thermoforming technique of CFRTP.</p>
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アキシャルギャップ誘導モータの特性解析
酒井 諒典, 吉田 征弘, 田島 克文
電気関係学会東北支部連合大会講演論文集 ( 電気関係学会東北支部連合大会実行委員会 ) 2017 ( 0 ) 1 - 1 2017年
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三次元磁石配置によるフェライト磁石モータの高性能化
齊藤 秀和, 吉田 征弘, 田島 克文
電気関係学会東北支部連合大会講演論文集 ( 電気関係学会東北支部連合大会実行委員会 ) 2017 ( 0 ) 2 - 2 2017年
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非対称磁極構造ネオジムボンド磁石モータの検討
奈良 祐介, 吉田 征弘, 田島 克文
電気関係学会東北支部連合大会講演論文集 ( 電気関係学会東北支部連合大会実行委員会 ) 2017 ( 0 ) 3 - 3 2017年