Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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Reduction Effect of Suspension Input Power Using Rotor Eccentricity in a Bearingless Motor Reviewed

Hiroshi Hara, Masatsugu Takemoto, Yasuhiro Tanaka, Akira Chiba, Tadashi Fukao

ICEMS 2008: PROCEEDINGS OF THE 11TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS, VOLS 1- 8 2968 - + 2008

Language：English Publishing type：Research paper (international conference proceedings) Publisher：WORLD PUBLISHING CORPORATION

Bearingless motors (BelMs) have two kinds of stator windings composed of motor windings and suspension windings in the same stator. Not only torque but also electromagnetic suspension force can be simultaneously generated in the same stator. Therefore, rotor shaft suspension can be realized without mechanical contacts and lubricant. In addition to advantages of magnetic bearings, the BelMs are expected to have advantageous features such as small size, low cost and high critical speed. This paper introduces reduction effect of suspension input power using rotor eccentricity actively in the BelMs. It is verified experimentally that the rotor eccentricity is effective in reducing the suspension input power.

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Suspension Characteristics of a Consequent-Pole Type Bearingless PM Motor with Wide Magnetic Gaps Reviewed

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

2008 IEEE POWER & ENERGY SOCIETY GENERAL MEETING, VOLS 1-11 1612 - + 2008

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

A new non-contact drive system has been developed employing a consequent-pole type bearingless permanent magnet (PM) motor. This bearingless; motor has a much wider gap with respect to its rotor radius. Wide magnetic gaps can cause a decrease in radial magnetic suspension force of the bearingless motor because of an increase in magnetic reluctance. In this paper, the magnetic suspension forces of the fabricated wide gap bearingless drive system are evaluated, when the rotor is magnetically levitated. 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 with wide magnetic gaps possesses sufficient magnetic suspension force for non-contact operation.

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Synchronous Reluctance Type Bearingless Motors with Multi-flux Barriers Reviewed

M. Takemoto, K. Yoshida, N. Itasaka, Y. Tanaka, A. Chiba, T. Fukao

2007 Power Conversion Conference - Nagoya 1559 - 1564 2007.4

Winding Design and Characteristic of a Consequent-pole Type Bearingless Motor With 4-axis Active Magnetic Suspension Reviewed

Miya Amada, Akira Mizuguchi, Yoshihiro Asano, Junichi Asama, Akira Chiba, Masatsugu Takemoto, Tadashi Fukao

CONFERENCE RECORD OF THE 2007 IEEE INDUSTRY APPLICATIONS CONFERENCE FORTY-SECOND IAS ANNUAL MEETING, VOLS. 1-5 552 - + 2007

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

Suspension winding design has been investigated for successful magnetic suspension under the limited voltage and current of suspension power electronics circuits. In bearingless motors, winding configuration design is a critical issue. To reduce requirements in suspension winding and its inverter, required current should be reduced. Thus, a large number of series windings with small diameter conductors is preferred. However, the current response in suspension winding becomes slow, and in the worst case, magnetic suspension is not possible. Design consideration of suspension winding is reported with experimental confirmation. Successful start up and operating characteristics are presented.

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Basic characteristics of a permanent-magnet type bearingless motor with positive salient pole Reviewed

Hirokazu Kusayanagi, Masatsugu Takemoto, Yasuhiro Tanaka, Akira Chiba, Tadashi Fukao

2007 INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS, VOLS 1-4 1897 - + 2007

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

Various types of permanent-magnet type bearingless motors, which have integrated magnetic bearings with permanent magnet synchronous motors, have been developed actively. However, these motors cannot effectively generate electromagnetic suspension force for rotor shaft suspension, because suspension flux is attenuated owing to passing through high magnetic reluctance of permanent magnets. Accordingly, the authors have proposed a novel permanent-magnet type bearingless motor with positive salient pole that inductance L-d in the d-axis direction is greater than inductance L-q in the q-axis direction. In previous papers, it was shown with 2D-FEM that the proposed motor can generate the suspension force effectively, because the suspension flux does not pass through the permanent magnets. This paper introduces basic characteristics of torque and suspension force in the proposed motor with test results of a prototype machine.

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Total efficiency of a deeply buried permanent magnet type bearingless motor equipped with 2-pole motor windings and 4-pole suspension windings Reviewed

Satoshi Yajima, Masatsugu Takemoto, Yasuhiro Tanaka, Akira Chiba, Tadashi Fukao

2007 IEEE POWER ENGINEERING SOCIETY GENERAL MEETING, VOLS 1-10 3879 - 3885 2007

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

Various kinds of permanent magnet type bearingless motors, which can be characterized by integration of permanent magnet synchronous motors and magnetic bearings, have been proposed and developed. These motors can realize magnetic suspension of rotor shafts by themselves without mechanical contacts or lubrication. However, these motors cannot generate suspension force effectively, because suspension flux necessary for generating suspension force passes through permanent magnets which have large magnetic reluctance. Accordingly, a novel deeply-buried permanent magnet type bearingless motor with 2-pole motor windings and 4-pole suspension windings has been proposed by the principal authors. In the proposed motor, the suspension flux does not pass through the permanent magnets. Thus, it was shown that the proposed motor can generate suspension force effectively in previous papers. In addition, it was confirmed experimentally that the proposed motor has the desired characteristic of high total efficiency considering suspension input power at rated speed. However, irrespective of the proposed motor, no studies have ever tried to make dear the total efficiency of the bearingless motors in wide speed range to the authors' knowledge. Therefore, this paper introduces the total efficiency of the proposed motor in the wide speed range, along with loading test results of a prototype motor.

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Basic characteristic of the multi-consequent-pole bearingless motor Reviewed

Natsuki Watanabe, Hiroya Sugimoto, Akira Chiba, Tadashi Fukao, Masatsugu Takemoto

2007 POWER CONVERSION CONFERENCE - NAGOYA, VOLS 1-3 1521 - + 2007

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

For low speed applications, such as rotating and swing stages, a multi-consequent-pole bearingless motor is proposed. This paper describes basic characteristics of a multi-consequent-pole bearingless motor. Unlike conventional bearingless motors, suspension force generating on consequent-pole type is independent of rotor rotational position. Thus, multi-pole rotors such as 40, 44, and 46 poles are easy without a penalty of high precision in rotating angular position detection. Basic design of pole number selection is discussed with suspension force and average torque capability. Magnetic force error can be reduced with multi-pole rotor configuration. A test machine has been constructed and driven by a compact drive and a CPU unit.

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Torque and suspension force in a bearingless switched reluctance motor

Masatsugu Takemoto, Akira Chiba, Hirofumi Akagi, Tadashi Fukao

ELECTRICAL ENGINEERING IN JAPAN 157 ( 2 ) 72 - 82 2006.11

Language：English Publishing type：Research paper (scientific journal) Publisher：SCRIPTA TECHNICA-JOHN WILEY & SONS

Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. The bearingless switched reluctance motors are characterized by integration of switched reluctance motors and magnetic bearings. These motors have two kinds of stator windings composed of motor main windings and suspension windings in the same stator in order to produce suspension force that can realize rotor shaft suspension without mechanical contacts or lubrication. For successful stable operation, accurate theoretical formulas of instantaneous torque and suspension force are necessary to a rotational speed controller and a rotor radial position controller. This paper derives the theoretical formulas of the instantaneous torque and the suspension force from an assumption of simple permeance distribution. This derivation process makes an assumption that fringing fluxes are distributed on elliptical lines. It is shown with experimental results that the derived theoretical formulas are very accurate in terms of practical application. (c) 2006 Wiley Periodicals, Inc.

DOI： 10.1002/eej.20157

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Characteristic of Magnetic Rotor Suspension and Total efficiency in a Deeply-Buried Permanent Magnet Type Bearingless Motor Equipped with 2-pole Motor Windings and 4-pole Suspension Windings Reviewed

S. Yajima, Y. Kodama, M. Takemoto, Y. Tanaka, A. Chiba, T. Fukao

2006 International Conference on Electrical Machines and Systems (ICEMS2006) ( DS3E2-12 ) 2006.11

Development of a 4-axis Actively Controlled Consequent-Pole Type Bearingless Motor Reviewed

Y. Asano, A. Mizuguchi, M. Amada, A. Chiba, M. Ooshima, M. Takemoto, T. Fukao, O. Ichikawa, D. G. Dorrell

2006 International Conference on Electrical Machines and Systems (ICEMS2006) ( DS2E2-02 ) 2006.11

Optimization of stator design in a consequent-pole type bearingless motor considering magnetic suspension characteristics Reviewed

Masakazu Nakagawa, Yoshikazu Asano, Akira Mizuguchi, Akira Chiba, Che Xiao Xuan, Masahide Ooshima, Masatsugu Takemoto, Tadashi Fukao, Osamu Ichikawa, David G. Dorrell

IEEE TRANSACTIONS ON MAGNETICS 42 ( 10 ) 3422 - 3424 2006.10

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 is presented. This produces stable magnetic suspension under motor torque generation. The suspension force reduction and direction error, which can be caused by torque generation, are limited in the proposed designs. In the optimization routine, the number of suspension and torque winding turns and air-gap length are carefully assessed. Three stators are constructed for experimental verification. The amplitude and direction errors for the suspension force are found to be within acceptable ranges and the operation of the magnetic suspension is acceptable.

DOI： 10.1109/TMAG.2006.879500

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Basic Characteristics of an Outer Rotor Consequent-pole Bearingless Drive Reviewed

T. Yamada, A. Chiba, A. Nakajima, T. Hoshino, T. Fukao, M. Takemoto, M. Oshima, O. Ichikawa

Tenth International Symposium on Magnetic Bearings 35 - 41 2006.8

Extension of Driving Speed Range for a Bearingless Motor with Simultaneous Magnetic Flux and Displacement Estimation Reviewed

千葉明, 山内義一, 大島政英, 深尾正, 竹本真紹

日本AEM学会誌 14 ( 1 ) 2006

Computation of Suspension Force with Magnetic Circuit Analysis in a Deeply-Buried Permanent Magnet Bearingless Motor equipped with 2-pole Motor Windings and 4-pole Suspension Windings Reviewed

児玉宜朋, 竹本真紹, 田中康寛, 深尾正, 千葉明

日本AEM学会誌 14 ( 1 ) 2006

Examination of a Compensator for Vibration Suppression of a Rotor Shaft in a Bearingless Motor Reviewed

松下将之, 千田浩史, 竹本真紹, 田中康寛, 深尾正, 千葉明

日本AEM学会誌 14 ( 1 ) 2006

A rotor angular position estimation based on a simple mathematical expression of the magnetizing characteristics of switched reluctance machines

Takanori Suzuki, Motoichiro Terada, Akira Chiba, Masatsugu Takemoto, Tadashi Fukao

INTERMAG ASIA 2005: Digests of the IEEE International Magnetics Conference 372 2005

Torque Calculation based on a Simple Mathematical Expression of Magnetizing Characteristic in Switched Reluctance Machines Reviewed

M. Terada, A. Chiba, M. Takemoto, T. Fukao

International Conference on Electrical Machines and Systems 2004 (ICEMS2004) ( PL-3 (430-M06-022) ) 2004.10

Radial Force and Torque of a Bearingless Switched Reluctance Motor Operating in a Region of Magnetic Saturation Reviewed

Masatsugu Takemoto, Akira Chiba, Hirofumi Akagi, Tadashi Fukao

IEEE Transactions on Industry Applications 40 ( 1 ) 103 - 112 2004.1

Publishing type：Research paper (scientific journal)

Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. These motors are characterized by integration of switched reluctance motors and magnetic bearings. It is essential for a control system to consider magnetic saturation in real time in order to realize stable operation at a full torque load. Thus, this paper proposes a method for fast calculation of radial force and torque of a bearingless switched reluctance motor operating in a region of magnetic saturation. It is shown experimentally that the proposed method is effective in calculating the radial force and the torque under conditions of magnetic saturation.

DOI： 10.1109/TIA.2003.821816

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Torque and Suspension Force in a Bearingless Switched Reluctance Motor Reviewed

竹本真紹, 千葉明, 赤木泰文, 深尾正

電気学会論文誌 D 124 ( 6 ) 556 - 565 2004

Publishing type：Research paper (scientific journal)

Bearingless switched reluctance motors, which can control rotor radial positions with magnetic force, have been proposed. The bearingless switched reluctance motors are characterized by integration of switched reluctance motors and magnetic bearings. These motors have two kinds of stator windings composed of motor main windings and suspension windings in the same stator in order to produce suspension force that can realize rotor shaft suspension without mechanical contacts or lubrication. For successful stable operation, accurate theoretical formulae of instantaneous torque and suspension force are necessary to a rotational speed controller and a rotor radial position controller. This paper derives the theoretical formulae of the instantaneous torque and the suspension force from an assumption of simple permeance distribution. This derivation process makes an assumption that fringing fluxes are distributed on elliptical lines. It is shown with experimental results that the derived theoretical formulae are very accurate in terms of practical application.© 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejias.124.556

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A Possible Output Area of Torque and Suspension Force in a Switched Reluctance Type Bearingless Motor with One Phase Excitation Reviewed

竹本真紹, 千葉明, 赤木泰文, 深尾正

電気学会論文誌 D 124 ( 7 ) 683 - 692 2004

Publishing type：Research paper (scientific journal)

Switched reluctance type bearingless motors are characterized by integration of switched reluctance motors and magnetic bearings. Therefore, these motors can control radial rotor positions with magnetic force actively. Production of suspension force for rotor shaft magnetic suspension is explained with differential stator windings. In the previous paper, accurate theoretical formulae of instantaneous torque and suspension force generated by one phase excitation were derived from an assumption of simple permeance distribution. From the derived theoretical formulae, it is found that there exist cross coupling between the instantaneous torque and the suspension force. This paper derives a possible output area of the instantaneous torque and the suspension force considering the cross coupling in order to realize a stable operation. It is shown with experimental results that the possible output area of the proposed motors is very accurate in terms of practical application.© 2004, The Institute of Electrical Engineers of Japan. All rights reserved.

DOI： 10.1541/ieejias.124.683

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