Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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フェライト磁石を用いたレアアースフリーモータの開発

竹本真紹

電気学会誌 132 ( 8 ) 2012

Test Results of High Torque and High Efficiency SRMs designed for 50kW Hybrid Electric Vehicle Reviewed

Motoki Takeno, Kyohei Kiyota, Yuta Murakami, Akira Chiba, Nobukazu Hoshi, Masatsugu Takemoto, Satoshi Ogasawara

2012 IEEE POWER AND ENERGY SOCIETY GENERAL MEETING 2012

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

This paper reports a comparison of the experimental results and analysis of the SRMs. Two Switched Reluctance Motors (SRMs) have been designed, constructed, and tested. The iron core of these machines is made of 6.5% silicon steel and conventional 3.5% silicon steel. The performance of these SRMs has been investigated in full loading tests. Efficiency of both SRMs has reached more than 90% and output power has reached more than 50 kW.

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Rotor Structure Suppressing Suspension Force Ripple in an IPM Type Bearingless Motor with 2-pole Motor Windings and 4-pole Suspension Windings Reviewed

Tatsuya Matsuzaki, Masatsugu Takemoto, Satoshi Ogasawara, Satoru Ota, Kazunobu Oi, Daiki Matsuhashi

2012 XXTH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES (ICEM) 744 - 750 2012

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

A bearingless motor has integrated characteristics of an electrical motor and a magnetic bearing. In general, surface permanent magnet (SPM) type rotor structure with a ring magnet magnetized in parallel is employed in high-speed PM type bearingless motors. However, in case of increasing motor size for high output, this rotor structure has problems of insufficient suspension force due to a wide air gap and high cost by using the large-diameter ring magnet magnetized in parallel. Therefore, this paper discusses a novel interior permanent magnet (IPM) type rotor structure for the high-speed and high-output bearingless motor. In the novel IPM type rotor structure, suspension force ripple is suppressed by means of arranging flux barriers at the suitable position in a rotor. It is confirmed with 2D-FEM that the proposed rotor structure using the flux barriers is effective in suppressing the suspension force ripple.

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Fundamental Analysis for a Ferrite Permanent Magnet Axial Gap Motor with Coreless Rotor Structure Reviewed

Kazuya Chiba, Shinji Chino, Masatsugu Takemoto, Satoshi Ogasawara

2012 15TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS 2012) 3 ( 1 ) 47 - 54 2012

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE

In general, a rare-earth permanent magnet that has large energy product is used for traction motors mounted on hybrid electric vehicles (HEVs). However, it is necessary to develop rare-earth-free motors for the HEV traction motors owing to several problems such as price hike and export restriction of rare-earth materials. In this paper, a ferrite permanent magnet axial gap motor with coreless rotor structure is introduced as the rare-earth-free motor. In addition, the motor structure and the results of 3D-FEA are described in detail.

DOI： 10.1541/ieejjia.3.47

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A Feedback-Type Dead-Time Compensation Method for High-Frequency PWM Inverter - Delay and Pulse Width Characteristics Reviewed

Masashi Ogawa, Satoshi Ogasawara, Masatsugu Takemoto

2012 TWENTY-SEVENTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC) 100 - 105 2012

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

This paper discusses a dead-time compensation method for high-frequency pulse-width modulation (PWM) inverters. Feedback-type dead-time compensation can eliminate error in the inverter output voltage. With next-generation switching devices using SiC, the switching frequency of inverters is expected to improve to 10-fold that of conventional inverters. However, as switching frequency increases, dead time will more strongly affect output voltage error. This paper proposes a new compensation method, which can reduce the minimum output pulse width and the phase delay of the inverter output voltage. An experimental system was constructed and tested, using highspeed power MOSFETs and a field-programmable gate array controller. Experimental results support the validity and usefulness of the proposed compensation method.

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Examination of an Interior Permanent Magnet Type Axial Gap Motor for the Hybrid Electric Vehicle Reviewed

Arakawa Tatsuro, Takemoto Masatsugu, Ogasawara Satoshi, Inoue Koji, Ozaki Osamu, Hojo Hirofumi, Mitani Hiroyuki

IEEE TRANSACTIONS ON MAGNETICS 47 ( 10 ) 3602 - 3605 2011.10

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Hybrid electric vehicles (HEVs) that emit less carbon dioxide have attracted much attention and rapidly become widespread, but further popularization of HEVs requires further technical advancement of mounted traction motors. Accordingly, our research group focuses on axial gap motors that can realize high torque density. In this paper, an axial gap motor with a novel interior permanent magnet (IPM) rotor structure is proposed and an examination of the proposed motor at the actual motor size of an HEV is presented. For comparison, we selected the newest radial gap-type 60kW IPM synchronous motor equipped in the third-generation Toyota Prius. Under the condition that the size of the proposed motor be the same as the comparison motor, we confirmed through three-dimensional finite-element analysis that the proposed motor could output twice the maximum torque of the comparison motor. In addition, a comparison was made with a previously reported conventional IPM-type axial gap motor, and the proposed motor was found to be more effective in generating reluctance torque. Moreover, the proposed motor exhibited sufficient durability to irreversible demagnetization of the permanent magnets, to stress caused by rotating the rotor, and to unbalanced electromagnetic forces caused by axial rotor eccentricity.

DOI： 10.1109/TMAG.2011.2150206

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A test result of a 50kW switched reluctance motor designed for a Hybrid Electric Vehicle Reviewed

Motoki Takeno, Yuichi Takano, Akira Chiba, Nobukazu Hoshi, Masatsugu Takemoto, Satoshi Ogasawara

2011 IEEE Power and Energy Society General Meeting 2011.7

Improvement of torque characteristic of a 50kW SRM for HEV with a consideration of magnetic saturation of stator yoke Reviewed

竹野元貴, 千葉明, 星伸一, 小笠原悟司, 竹本真紹

日本AEM学会誌 19 ( 2 ) 372 - 377 2011.6

Development of a 5‐axis Active Control Type Bearingless Canned Motor Pump Reviewed

山本直人, 竹本真紹, 小笠原悟司, 平櫛真男

日本AEM学会誌 19 ( 2 ) 146 - 152 2011.6

A Study of the Number of the Slots in a Ferrite Permanent Magnet Axial Gap Motor for the Hybrid Vehicles Reviewed

茅野真治, 三浦昂彦, 竹本真紹, 小笠原悟司, 千葉明, 星伸一

日本AEM学会誌 19 ( 2 ) 121 - 127 2011.6

Structure and Fundamental Characteristics of a Ferrite Permanent Magnet Axial Gap Motor for the Next Generation Hybrid Vehicle Reviewed

三浦昂彦, 茅野真治, 竹本真紹, 小笠原悟司, 千葉明, 星伸一

日本AEM学会誌 19 ( 2 ) 128 - 133 2011.6

Influence of Switched Reluctance Motor Drive System on Vibration Reviewed

今川聖, 星伸一, 千葉明, 竹本真紹, 小笠原悟司

日本AEM学会誌 19 ( 2 ) 90 - 96 2011.6

Torque Density and Efficiency Improvements of a Switched Reluctance Motor Without Rare-Earth Material for Hybrid Vehicles Reviewed

Akira Chiba, Yuichi Takano, Motoki Takeno, Takashi Imakawa, Nobukazu Hoshi, Masatsugu Takemoto, Satoshi Ogasawara

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 47 ( 3 ) 1240 - 1246 2011.5

Language：English Publishing type：Research paper (scientific journal) Publisher：IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

A machine design of a switched reluctance motor having competitive torque and efficiency as well as compactness with respect to an interior permanent-magnet (IPM) synchronous motor (IPMSM) in a hybrid electric vehicle (Toyota Prius 2003) has been investigated. A torque of 400 N . m is set as a target with an outer diameter of 269 mm with an axial length of 156 mm, including coil end lengths. In addition, a 50-kW field weakening capability must be competitive to the IPMSM. The highest efficiency of 95% is also aimed. Stator and rotor structures and iron material are investigated. Test machines are built. Static and light load tests are carried out.

DOI： 10.1109/TIA.2011.2125770

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Equivalency of series-parallel hybrid system using planetary gear and hybrid system using EVT Reviewed

Yuki Kubo, Satoshi Ogasawara, Masatsugu Takemoto

8th International Conference on Power Electronics - ECCE Asia 2011.5

Experimental estimation of a 5-axis active control type bearingless canned motor pump Reviewed

Naoto Yamamoto, Masatsugu Takemoto, Satoshi Ogasawara, Masao Hiragushi

2011 IEEE International Electric Machines & Drives Conference (IEMDC) 2011.5

Current Status of Novel Permanent Magnet Synchronous Motors without Rare Earth Materials

竹本真紹

電気学会誌 131 ( 11 ) 2011

Technical Development Report

竹本真紹

電気学会論文誌 D 131 ( 4 ) 2011

Novel Switched Reluctance Motor Drive Circuit with Voltage Boost Function without Additional Reactor Reviewed

Yujiro Kido, Nobukazu Hoshi, Akira Chiba, Satoshi Ogasawara, Masatsugu Takemoto

PROCEEDINGS OF THE 2011-14TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE 2011) 2011

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

Switched reluctance motor (SRM) is attractive for the driving motor of electric vehicles (EVs) and hybrid electric vehicles (HEVs) from the view point which does not use rare-earth materials. However, special drive circuit, which is different from general three-phase inverter used for permanent magnet synchronous motor and induction motor, is required in order to drive SRM. By the way, in some of commercial HEVs, boost chopper combined with three-phase inverter is used in order to apply high voltage to motor windings at high-speed range. In this system, the size of the additional reactor, which is required in boost chopper, is a problem. Then, this paper proposes a novel drive circuit with voltage boost function without additional reactor for SRM. In addition, control scheme and controller configuration for the proposed circuit are described. Moreover, the effectiveness of the proposed circuit is verified by simulation and experimental results.

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Fundamental Characteristics of a Ferrite Permanent Magnet Axial gap Motor with Segmented Rotor Structure for the Hybrid Electric Vehicle Reviewed

Shinji Chino, Takahiko Miura, Masatsugu Takemoto, Satoshi Ogasawara, Akira Chiba, Nobukazu Hoshi

2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 2805 - 2811 2011

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

In newest hybrid electric vehicle (HEV) propulsion systems, permanent magnet synchronous motors (PMSMs) using high-performance rare-earth permanent magnets play an important role. However, rare earth materials employed in the high-performance rare-earth permanent magnets have problems such as price rise and export restriction. Thus, it is necessary to develop a rare-earth-free motor for the HEVs. In this paper, a novel ferrite permanent magnet axial gap motor with segmented rotor structure is introduced. In order to obtain the fundamental characteristics of this motor, a prototype is fabricated and tested. The experiment results of the prototype are shown in detail. It can be confirmed with the experiment results of the prototype that the proposed motor with the segmented rotor structure has the possibility of the development of the rare-earth-free motor enough.

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Power and Efficiency Measurements and Design Improvement of a 50kW witched Reluctance Motor for Hybrid Electric Vehicles Reviewed

Motoki Takeno, Akira Chiba, Nobukazu Hoshi, Satoshi Ogasawara, Masatsugu Takemoto

2011 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 1495 - 1501 2011

Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE

A switched reluctance motor is one of possible candidates of rare-earth-free-motors. A prototype machine has been designed, having competitive dimensions, torque, power, and efficiency with respect to the IPMSM employed in the HEVs (Toyota Prius 2003). In this paper, test results are presented including a full load test. It is found that competitive power and efficiency of 50kW and 95%, respectively, are achieved, although 85% of the target torque is possible. Despite of the maximum torque, the most speed-torque region is found to be covered by the test SRM. The cause of discrepancy in the measured and calculated torque values is examined. Considering the discrepancy a new machine is designed for the second stage development.

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Papers - TAKEMOTO Masatsugu