Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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Evaluation of a Bearingless PM Motor With Wide Magnetic Gaps Reviewed

Junichi Asama, Miya Amada, Norimasa Tanabe, Naoya Miyamoto, Akira Chiba, Satoru Iwasaki, Masatsugu Takemoto, Tadashi Fukao, M. Azizur Rahman

IEEE TRANSACTIONS ON ENERGY CONVERSION 25 ( 4 ) 957 - 964 2010.12

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

A new noncontact drive system has been developed employing a consequent-pole-type bearingless permanent magnet (PM) motor and a thrust magnetic bearing. This bearingless motor has a wide magnetic gap. The wide magnetic gap may cause a decrease in radial magnetic suspension force because of an increase in magnetic reluctance. A thrust magnetic bearing is installed at the end of the shaft because strong thrust force exists in centrifugal pump applications. In this paper, the magnetic suspension forces and rotation characteristics of the experimental prototype are evaluated while the rotor is magnetically suspended. Experimental results are also compared to the calculated ones using the finite-element method. It is demonstrated that the developed consequent-pole-type bearingless PM motor possesses sufficient magnetic suspension force for noncontact operation.

DOI： 10.1109/TEC.2010.2040828

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A Novel Structure of a 3-axis Active Control Type Magnetic Bearing With a Cylindrical Rotor Reviewed

K. Tsuchida, M. Takemoto, S. Ogasawara

2010 International Conference on Electrical Machines and Systems (ICEMS 2010) 1695 - 1700 2010.10

Torque density and efficiency improvements of a Switched Reluctance Motor without rare earth material for hybrid vehicles Reviewed

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

2010 IEEE Energy Conversion Congress and Exposition 2653 - 2659 2010.9

A ferrite permanent magnet axial gap motor with segmented rotor structure for the next generation hybrid vehicle Reviewed

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

The XIX International Conference on Electrical Machines - ICEM 2010 2010.9

A simulation method using state transition matrix suitable for real-time simulators Reviewed

Yuki Kubo, Satoshi Ogasawara, Masatsugu Takemoto

The 2010 International Power Electronics Conference - ECCE ASIA - 2444 - 2449 2010.6

Prototype and characteristics measurement of bearingless motor with wide air gap structure

Kazunobu Oi, Daiki Matsuhashi, Masakatsu Nomura, Masatsugu Takemoto, Tadashi Fukao

The 2010 International Power Electronics Conference - ECCE ASIA - 581 - 586 2010.6

Design and analysis of a switched reluctance motor for next generation hybrid vehicle without PM materials Reviewed

Yuichi Takano, Motoki Takeno, Nobukazu Hoshi, Akira Chiba, Masatsugu Takemoto, Satoshi Ogasawara, M. Azizur Rahman

The 2010 International Power Electronics Conference - ECCE ASIA - 1801 - 1806 2010.6

A basic study on inverter output filter for radiative noise suppression Reviewed

Jun Fukuda, Satoshi Ogasawara, Masatsugu Takemoto

The 2010 International Power Electronics Conference - ECCE ASIA - 2872 - 2876 2010.6

Experimental evaluation of a new PWM control scheme for matrix converters

Tomohiko Sanada, Satoshi Ogasawara, Masatsugu Takemoto

The 2010 International Power Electronics Conference - ECCE ASIA - 2366 - 2371 2010.6

研究グループ紹介：北海道大学大学院情報科学研究科システム情報科学専攻システム変換学研究室

小笠原悟司, 竹本真紹

電気学会論文誌Ｄ（産業応用部門誌） 130 ( 2 ) NL2_05 2010

Operating Area of a Switched Reluctance Motor with Continuous Current Operation Reviewed

Yuichi Takano, Tomohiro Maeda, Motoki Takeno, Akira Chiba, Nobukazu Hoshi, Masatsugu Takemoto, Satoshi Ogasawara, Tadashi Fukao

IEEE POWER AND ENERGY SOCIETY GENERAL MEETING 2010 2010

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

This paper shows an operation area consideration of a torque and speed region of a 50kW Switched Reluctance Motor (SRM) for Hybrid Electric Vehicle (HEV) applications. Increasing a number of turns in stator windings is effective to reduce phase current of SRM at low rotational speed, however, motor output power falls significantly at high speed because of an increased back emf.
A continuous current operation can enhance output power at high rotational speed. The continuous current operation can be realized by expanding excitation angle of applied voltage. In this operation, phase current is increased, thus, motor output power is maintained at high rotational speed, which is strongly required in HEV applications. An effectiveness of the continuous current operation is shown for a 50kW SRM aimed for HEV application. The SRM is designed with competitive dimensions, efficiency, weight, voltage and current with respect to HEV IPM motors.

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Development of a Four-Axis Actively Controlled Consequent-Pole-Type Bearingless Motor Reviewed

Yoshihiro Asano, Akira Mizuguchi, Miya Amada, Junichi Asama, Akira Chiba, Masahide Ooshima, Masatsugu Takemoto, Tadashi Fukao, Osamu Ichikawa, David G. Dorrell

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 45 ( 4 ) 1378 - 1386 2009.7

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

In this paper, a design-optimization method for a consequent-pole bearingless motor with a rather large air-gap length is presented. A rotor iron and permanent-magnet structure is proposed which enhances the suspension-force capability during startup. Magnetic saturation in the rotor-iron pole area is solved, and the stator iron is designed so that magnetic saturation is avoided. The design optimization is based on finite-element-method analysis. It is shown that startup is achieved from the touch-down condition in the experiments.

DOI： 10.1109/TIA.2009.2023498

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Suspension Characteristics Measurement of a Bearingless Motor Reviewed

Naoya Miyamoto, Takehiro Enomoto, Miya Amada, Junichi Asama, Akira Chiba, Tadashi Fukao, Satoru Iwasaki, Masatsugu Takemoto

IEEE TRANSACTIONS ON MAGNETICS 45 ( 6 ) 2795 - 2798 2009.6

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

Bearingless PM motors which have additional suspension windings have been designed with 3D FEM. To verify satisfactions in practical application, a test machine has been built. In this paper, suspension force is measured with the static forces. Two experimental methods are proposed. It is proved that those procedures are suitable even if it is in limited conditions, only one shaft end can be used for static force applied. Furthermore, the relation of the suspension force and rotor rotational angle is shown.

DOI： 10.1109/TMAG.2009.2018658

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Voltage Characteristics of a Consequent-Pole Bearingless PM Motor With Concentrated Windings Reviewed

Junichi Asama, Miya Amada, Masatsugu Takemoto, Akira Chiba, Tadashi Fukao, Azizur Rahman

IEEE TRANSACTIONS ON MAGNETICS 45 ( 6 ) 2823 - 2826 2009.6

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

A bearingless permanent magnet (PM) motor combines functions of non-contact magnetic suspension and torque generation together, thus it can drive without mechanical contact. Unlike conventional bearingless PM motors, such as a surface-mounted PM motor, a consequent-pole type of bearingless PM motor has inherent advantages. It can regulate the radial rotor positions independently of the motor drive and has no tradeoff between radial suspension force and torque. In the consequent-pole bearingless PM motors, distributed or concentrated windings can be employed to the motor winding structure. However, relationship between voltage characteristics and the winding design has not yet been revealed. In this paper, the induced electromotive force (EMF) of the consequent-pole bearingless PM motor is numerically calculated on the basis of the magnetic flux distribution in the airgap around the rotor. It is found that the EMF is distorted by the second harmonic at a specific slot number in a consequent-pole rotor. The calculated EMFs are confirmed with the experimental results in the fabricated test machines.

DOI： 10.1109/TMAG.2009.2018679

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A Proposal of an Active Thrust Magnetic Bearing with a Cylindrical Rotor Core Reviewed

HIJIKATA Kimio, KOBAYASHI Syunsuke, MIYAZAKI Hajime, TAKEMOTO Masatugu, TANAKA Yasuhiro, CHIBA Akira, FUKAO Tadashi

Journal of the Japan Society of Applied Electromagnetics and Mechanics 17 ( 1 ) 96 - 101 2009.3

Behavior of a Novel Thrust Magnetic Bearing with a Cylindrical Rotor on High Speed Rotation Reviewed

HIJIKATA Kimio, TAKEMOTO Masatsugu, OGASAWARA Satoshi, CHIBA Akira, FUKAO Tadashi

IEEE Transactions on Magnetics 45 ( 10 ) 4617 - 4620 2009

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

Thrust magnetic bearings, which can regulate axial displacement of a rotor shaft, have been used for high-speed rotation. However, conventional thrust magnetic bearings have many problems in manufacturing and assembling caused by a large disk rotor of itself. Therefore, we have proposed a novel structure of a thrust magnetic bearing without the large disk rotor. A cylindrical rotor, that has a small diameter as well as a simple shape, is used in the proposed thrust magnetic bearing. This paper introduces the structure and the principle of the proposed thrust magnetic bearing. In addition, it is shown with experiments on high-speed operation that the proposed thrust magnetic bearing is equipped with the sufficient performance in order to make for practical use.

DOI： 10.1109/TMAG.2009.2022178

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A Case Study of Suspension Characteristics of a Bearingless Motor Supplied by Inverters Having Different Voltage and Current Ratings Reviewed

AMADA Miya, MIYAMOTO Naoya, ENOMOTO Takehiro, TANABE Norimasa, ASAMA Junichi, CHIBA Akira, FUKAO Tadashi, IWASAKI Satoru, TAKEMOTO Masatsugu

Journal of System Design and Dynamics 3 ( 4 ) 506 - 518 2009

Language：English Publisher：The Japan Society of Mechanical Engineers

A wide magnetic gap consequent-pole type bearingless motor has been developed. The wide magnetic gap makes it difficult to start up and suspend a shaft with reasonable suspension voltage and current. To provide high current, high voltage rating is demanded, although, high voltage causes bad influence on magnetic suspension. In this paper, the authors have investigated the start-up and rotational characteristics of a prototype bearingless machine driven by voltage source inverters having the rated voltage of 200V and 100V. When the rated voltage is not suitable, significant problems are occurred. The effectiveness of proper selection in the rated voltage is discussed. The result of this study shows that the 100V inverter is a better choice for the bearingless motor.

DOI： 10.1299/jsdd.3.506

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Experimental Evaluation of Magnetic Suspension Characteristics in a 5-axis Active Control Type Bearingless Motor without a Thrust Disk for Wide-gap Condition Reviewed

Masatsugu Takemoto, Satoru Iwasaki, Hajime Miyazaki, Akira Chiba, Tadashi Fukao

2009 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION, VOLS 1-6 2282 - + 2009

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

Bearing less motors are characterized by integration of electrical motors and magnetic bearings. These motors can realize magnetic suspension of rotor shafts without mechanical contacts. Recently, non-contact canned motor pumps without expendable parts by means of using these motors have been vigorously developed. In these pumps, the large magnetic gap length of about 5 mm or more is required of the bearingless motors, because fluid flows into the gap. It becomes difficult to generate sufficient suspension force for magnetic suspension, as the magnetic gap length is increased.Therefore, a novel structure of a 5-axis active control type bearingless motor which can generate the sufficient suspension force under wide-gap condition has been proposed by the principal authors. In general, thrust disks with large outside diameters are used in thrust magnetic bearings. However, in the canned motor pump application, rotational speed is limited to prevent cavitation caused by the large thrust disks. Accordingly, the proposed novel structure is equipped with a cylindrical rotor instead of the large thrust disk, and can generate sufficient suspension force in the axial direction, also. This paper introduces magnetic suspension characteristics of the proposed novel structure with experiments.

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Basic Characteristics of an Active Thrust Magnetic Bearing With a Cylindrical Rotor Core Reviewed

Kimio Hijikata, Shunsuke Kobayashi, Masatsugu Takemoto, Yasuhiro Tanaka, Akira Chiba, Tadashi Fukao

IEEE TRANSACTIONS ON MAGNETICS 44 ( 11 ) 4167 - 4170 2008.11

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

Magnetic bearings, which can suspend rotor shafts by electromagnetic force without mechanical contacts and lubrication, have been developed and commercialized. In the various types of magnetic bearings, thrust magnetic bearings with thrust disks are generally used for active suspension control of thrust direction. However, the large thrust disks of the thrust magnetic bearings have caused various problems. Therefore, this paper proposes a novel structure of an active thrust magnetic bearing using a cylindrical rotor core without the large thrust disk, and it is shown with 3-D-FEA and experiment that the proposed thrust magnetic bearing with the cylindrical rotor core is effective in producing thrust force.

DOI： 10.1109/TMAG.2008.2002628

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環境負荷の低減めざす新技術

小笠原悟司, 竹本真紹

電気学会誌 128 ( 10 ) 697-697 (J-STAGE) - 697 2008

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