Research Achievements - Original paper -

Calculation for Output Characteristic of Motor Structure with Boost Reactor Function Based on RNA

Zhang L., Yoshida Y., Sakurai S., Handa N., Tajima K.

Transaction of the Magnetics Society of Japan Special Issues ( The Magnetics Society of Japan )  8 ( 1 ) 52 - 56   2024.05  [Refereed]

Research paper (journal)  

DOI CiNii Research

Study on High Torque IPMSM Using Sm-Fe-N Bonded Magnet

Takeda K., Yoshida Y., Yoshida R., Abe M., Tada S., Yamamoto M., Tajima K.

Transaction of the Magnetics Society of Japan Special Issues ( The Magnetics Society of Japan )  8 ( 1 ) 62 - 66   2024.05  [Refereed]

Research paper (journal)   Domestic Co-author

DOI CiNii Research

A Study on Motor Structure with Boost Reactor Function

Zhang Lei, Yoshida Yukihiro, Sakurai Sho, Handa Naoto, Tajima Katsubumi

IEEJ Transactions on Fundamentals and Materials ( The Institute of Electrical Engineers of Japan )  144 ( 4 ) 139 - 144   2024.04  [Refereed]

Research paper (journal)   Domestic Co-author

DOI CiNii Research

Prototype Test of Asymmetric Pole Structure IPM Motor Using Bonded Magnet

Tsukada Y., Yoshida Y., Handa N., Tajima K.

Transaction of the Magnetics Society of Japan Special Issues ( The Magnetics Society of Japan )  7 ( 1 ) 73 - 79   2023.05  [Refereed]

Research paper (journal)   Domestic Co-author

DOI CiNii Research

Study on Design Method of Axial Gap Induction Motor

Terui T., Yoshida Y., Tajima K.

Transaction of the Magnetics Society of Japan Special Issues ( The Magnetics Society of Japan )  6 ( 1 ) 74 - 80   2022.05  [Refereed]

Research paper (journal)  

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   2022.02  [Refereed]

Research paper (journal)   Domestic Co-author

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   2020.11  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2020.03  [Refereed]

Research paper (journal)   Domestic Co-author

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   2020.03  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2020.02  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2019.05  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2018.09  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2018.07  [Refereed]

Research paper (journal)   Domestic Co-author

<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

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   2018.05  [Refereed]

Research paper (journal)   Domestic Co-author

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   2018.05  [Refereed]

Research paper (journal)   Domestic Co-author

Development of a visualization method for motion-characteristic distribution of Japanese folk dances - A case study of the Bon Odori dance

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

Journal of Information Processing ( 情報処理学会 )  26 ( 0 ) 74 - 84   2018.02  [Refereed]

Research paper (journal)   Domestic Co-author

<p>This study proposes a method to systematically visualize the motion-characteristic distribution of Japanese folk dances passed down in a certain area. This is accomplished by adopting an approach that involves analyzing motion-capture data collected from the dances. The visualization process in the proposed method consists of three stages. The first stage is the modeling of the relationship among motion-capture data, folk dances, and the settlements in which folk dances have been passed down. This relationship is modeled as a hierarchical-structure model. The second stage is the extraction of motion characteristics from motion-capture data streams. The motion characteristics of each data stream are summarized as a fourteen-dimensional feature vector. The third stage is the visualization of the motion-characteristic distribution of the dances investigated. Each of the dances is mapped on a two-dimensional scatter plot in accordance with the feature quantities obtained in the second stage. Information on the hierarchical-structure model constructed in the first stage is also displayed. The analysis results for the distribution of Bon Odori dances showed that the proposed method could have almost completely visualized the motion-characteristic distribution of sample folk dances, while also demonstrating consistency with the knowledge of the dances acquired in the previous studies.</p>

DOI Repository

Low-dimensional Feature Vector Extraction from Motion Capture Data by Phase Plane Analysis

Takeshi Miura, Takaaki Kaiga, Takeshi Shibata, Katsubumi Tajima, Hideo Tamamoto

Journal of Information Processing   25   884 - 887   2017.09  [Refereed]

Research paper (journal)   Domestic Co-author

This paper proposes a method to obtain a low-dimensional feature vector appropriately representing the characteristics of a given motion-capture data stream. The feature vector is derived based on the concept of phase plane analysis. A set of phase plane trajectories are obtained from the temporal variation of the state variables representing the body-segment arrangement. The information on six motion-characteristic properties is extracted from the shapes of the trajectories, and used as the components of a six-dimensional feature vector. The experimental results showed the effectiveness and limitation of the proposed method.

DOI

Estimation of Eddy current loss for transformer windings based on RNA

Takuya Hiwatashi, Katsubumi Tajima, Yukihiro Yoshida

日本磁気学会論文特集号   1 ( 1 ) 61 - 65   2017.05  [Refereed]

Research paper (journal)   Domestic Co-author

Demagnetizing Analysis of Ferrite Magnet Motor Based on RNA

Y. Yoshida, D. Momma, K. Tajima

日本磁気学会論文特集号   1 ( 1 ) 66 - 69   2017.05  [Refereed]

Research paper (journal)   Domestic Co-author

Physical Constitution Adjustment for a Human Body Model Used in Motion Capture Data Analysis

Takeshi Miura, Takaaki Kaiga, Takeshi Shibata, Katsubumi Tajima, Hideo Tamamoto

IEEJ Transactions on Electrical and Electronic Engineering   11 ( S2 ) S140 - S141   2016.12  [Refereed]

Research paper (journal)   Domestic Co-author

DOI