研究等業績 - 原著論文 - 田島　克文

Design and Analysis of Outer-Rotor PM Motor with Segmented rotor-shape for Utilizing Reluctance Torque

Sakurai S., Yoshida Y., Tajima K.

Journal of the Magnetics Society of Japan ( Journal of the Magnetics Society of Japan )  49 ( 6 ) 104 - 109   2025年11月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>  Recently, the market scale of a drone has grown significantly. To utilize a drone more, the operating time needs to be extended. So, a drone motor should be lightweight and high power. However, the almost drone motor has a Surface permanent magnet, and improving torque is difficult because the outer-rotor has a low-degree design. Increasing torque, the Segment PM is adapted to the drone motor. It can use a reluctance torque with an outer-rotor type. However, the ratio of the reluctance torque is low and it is not enough from a result of the previous paper. So, improvement of the reluctance torque is desired. This paper presents a novel drone motor applied to Segment PM and investigated a ratio of reluctance torque by finite element method (FEM).</p>

DOI CiNii Research

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 )  9 ( 1 ) 66 - 71   2025年05月  [査読有り]

研究論文（学術雑誌）   国内共著

<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>

DOI CiNii Research

Sm-Fe-Nボンド磁石を用いた射出一体成形IPMSMの開発

吉田 理恵, 吉田 征弘, 上野 泰誠, 山本 宗生, 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 )  9 ( 1 ) 77 - 81   2025年05月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>  This paper presents the evaluation of an interior permanent magnet synchronous motor (IPMSM) prototype, in which Sm-Fe-N plastic-bonded magnets were injection-molded into the rotor core. The mold design and rotor shape during the injection molding process were clarified through finite element method (FEM) analysis, and the characteristics of the prototype rotor magnets largely matched the designed specifications. Furthermore, to evaluate the motor characteristics, a motor was prototyped, and the induced voltage was measured. The measurement results closely matched the FEM simulation, demonstrating the validity of the proposed motor. Additionally, a comparison with an IPMSM using Nd-Fe-B sintered magnets, conducted through FEM analysis, showed that the proposed motor exhibited comparable torque characteristics, demonstrating its practical utility.</p>

DOI CiNii Research

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 )  8 ( 1 ) 52 - 56   2024年05月  [査読有り]

研究論文（学術雑誌）  

<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>

DOI CiNii Research

Sm-Fe-Nボンド磁石を用いた高トルクIPMSMに関する検討

武田 一真, 吉田 征弘, 吉田 理恵, 阿部 将裕, 多田 秀一, 山本 宗生, 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 )  8 ( 1 ) 62 - 66   2024年05月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>  Permanent magnet motors use powerful neodymium sintered magnets, which contain dysprosium (Dy), a heavy rare earth, to improve the coercive force in general.We have been studying heavy rare earth-free motors using bonded magnets. In this paper, the torque characteristics of a motor using Dy-free samarium-iron-nitrogen (Sm-Fe-N) bonded magnets were calculated using the finite element method, aiming for torque characteristics comparable to those of a motor using neodymium sintered magnets. This study shows that a motor using Sm-Fe-N bonded magnets can output torque close to that of a motor using neodymium sintered magnets by changing the magnet arrangement of the rotor from a V-shape to a U-shape to increase the magnet surface area and to eliminate leakage flux at the flux barrier.</p>

DOI CiNii Research

昇圧リアクトル機能を有するモータ構造に関する検討

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  [査読有り]

研究論文（学術雑誌）   国内共著

<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>

DOI CiNii Research

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  [査読有り]

研究論文（学術雑誌）   国内共著

<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>

DOI CiNii Research

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]

研究論文（学術雑誌）  

<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>

DOI CiNii Research

Geometric Correction of Historical Maps Based on Vector Field Analysis

Takeshi Miura, Katsubumi Tajima

Journal of Information Processing ( Information Processing Society of Japan )  30   85 - 95   2022年02月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Maximum Torque Micro-Step Drive of a Five-Phase Hybrid Stepping Motor

Matsuo K.

IEEJ Transactions on Electrical and Electronic Engineering ( IEEJ Transactions on Electrical and Electronic Engineering )    2022年  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Point location conversion in distance cartogram construction based on vector field analysis

Miura T., Tajima K.

Journal of Information Processing ( 情報処理学会 )  28 ( 0 ) 711 - 714   2020年11月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>Distance cartograms are deformed maps in which the distance of each of the preselected point pairs in the geographic map is changed in step with a specified value such as a travel time. In distance cartogram construction, the preselected points are fixed in the first step whereas the locations of other points are converted in the second step. This paper proposes a new point location conversion method for the second step. The conversion process is modeled as a phenomenon in a three-dimensional vector field. Each point in the geographic map is connected with the corresponding point in the cartogram by a streamline of the field. The connection relationship becomes a smooth homeomorphism required in distance cartogram construction. The experimental results demonstrate its effectiveness.</p>

DOI CiNii Research

Study on Asymmetric Magnetic Pole Structure for IPM Motor Using Neodymium Bonded Magnet

T. Yanagisawa, Y. Yoshida, K. Tajima

Journal of the Magnetics Society of Japan ( 日本磁気学会 )  44 ( 2 ) 45 - 51   2020年03月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI

Vibration reduction of a stepping motor using a pre-compensator to remove control delay

Matsuo K., Miura T., Tajima K.

IEEJ Journal of Industry Applications ( 電気学会 )  9 ( 2 ) 191 - 192   2020年03月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>To reduce vibration, overshoot, and tracking error of the rotor in an open-loop micro-step drive of a stepping motor, we propose a novel pre-compensator using a low-pass type filter without control delay. The pre-compensator consists of a low-pass filter that removes the natural frequency component causing the vibration and a zero-phase filter that removes the control delay. Finally, a position control experiment demonstrates the validity of the pre-compensator.</p>

DOI CiNii Research

Development of a point location conversion approach for distance cartogram construction

Miura T., Tajima K.

Journal of Information Processing ( 情報処理学会 )  28 ( 0 ) 87 - 90   2020年02月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>Distance cartograms are deformed maps in which the distance of each of the preselected point pairs in the geographic map is changed in step with a specified value. In distance cartogram construction, the preselected points such as train stations are fixed in the first step, and other points such as those comprising railroads are fixed in the second step. This paper proposes a new point location conversion approach for the second step. In the approach, a triangle in the geographic map which consists of two points already fixed in the first step and a point to be fixed in the second step, is converted into a similar triangle in the cartogram. The experimental results demonstrate its effectiveness.</p>

DOI CiNii Research

Improvement of moving least squares transformation in distance cartogram construction

Takeshi Miura, Katsubumi Tajima

IEEJ Transactions on Electrical and Electronic Engineering ( Wiley )  14 ( 12 ) 1879 - 1880   2019年11月  [査読有り]

研究論文（学術雑誌）   国内共著

DOI CiNii Research

Development of a cartogram construction method for visualizing Japanese folk dance distribution

Miura T., Shibata T., Uemura M., Tajima K., Tamamoto H.

Journal of Information Processing ( 情報処理学会 )  27 ( 0 ) 378 - 391   2019年05月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>This paper proposes a cartogram construction method to visualize the relevance of the motion-characteristic distribution of Japanese folk dances to the geographic elements of regional communities in which the dances have been passed down. We use motion capture data of the dances to quantitatively extract their motion characteristics. To systematically organize the cartogram construction process, we adopt a hierarchical model representing the relationship among motion capture data, folk dances, and settlements in which the dances have been passed down. Different cartogram types are selected for different levels in the hierarchical model, and, thereby, a hybrid of circle and distance cartograms is provided. We show that an algorithm to locate the constituents of the hierarchical model in the above hybrid cartogram can be obtained by slightly modifying the existing circle cartogram construction algorithm. On the other hand, we develop another new algorithm to locate geographic elements other than the constituents of the hierarchical model in the hybrid cartogram. The results obtained by analyzing the Furyu type folk dances passed down in Akita Prefecture demonstrated the effectiveness of the proposed method.</p>

DOI CiNii Research

Automatic tuning of pulse timings using neural network for rotor oscillation damping of a stepping motor

Matsuo K., Xiang Z., Miura. T., Tajima K.

IEEJ Journal of Industry Applications ( IEEJ Journal of Industry Applications )  7 ( 5 ) 443 - 444   2018年09月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>To suppress the rotor oscillation when positioning a stepping motor, we propose a novel scheme that automatically tunes the pulse timings in back-phasing damping using a neural network, from the input of only a step response. Here, the network is learned from the response and its timings for a few loads. To validate the scheme, the drives that satisfactorily damp the rotor oscillation are demonstrated using the timings estimated with unknown loads attached.</p>

DOI CiNii Research

Precise position control of a stepping motor in micro-step drive using pre-compensator

Matsuo K., Miura T., Tajima K.

IEEJ Journal of Industry Applications ( 電気学会 )  7 ( 4 ) 369 - 370   2018年07月  [査読有り]

研究論文（学術雑誌）   国内共著

<p>In this paper, we propose a method for improving the positional accuracy of a stepping motor in micro-step drive by just modifying a reference angle using the proposed pre-compensator. For a given reference angle, the pre-compensator outputs the modified reference, which cancels the positional error due to the torque ripples and friction. To validate this method, position control experiments were carried out with and without the pre-compensator. The results demonstrate that the positional accuracy of micro-step drive with the pre-compensator is significantly better than that without the pre-compensator.</p>

DOI CiNii Research

Examination of High-Efficiency Rare Earth Free Motor with Three-Dimensional Magnet Arrangement

H. Saito, Y. Yoshida, K. Tajima

日本磁気学会論文特集号   2 ( 1 ) 37 - 42   2018年05月  [査読有り]

研究論文（学術雑誌）   国内共著

Study on Analysis of Torque-Slip Characteristics of Axial Gap Induction Motor

R. Sakai, Y. Yoshida, K. Tajima

日本磁気学会論文特集号   2 ( 1 ) 43 - 47   2018年05月  [査読有り]

研究論文（学術雑誌）   国内共著