Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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Development of a High-Frequency Space Vector Pulse Width Modulated Inverter with an Active Common-Noise Canceler Reviewed

Masashi Ogawa, Satoshi Ogasawara, Masatsugu Takemoto

2014 IEEE 36TH INTERNATIONAL TELECOMMUNICATIONS ENERGY CONFERENCE (INTELEC) 2014

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

This paper proposes a new circuit configuration of the active common-noise canceler (ACC), which is used to reduce electromagnetic interference of a space vector modulation (SVPWM) inverter. The original ACC, which was proposed by the authors, cancels all components of the common-mode voltage and, therefore, cannot be used in an SVPWM inverter owing to the low-frequency component of the common-mode (zero-sequence) voltage. The proposed ACC cancels only the high-frequency component of the common-mode voltage so it can be used in SVPWM inverters. Furthermore, the high-frequency carrier makes a large contribution to downsizing the common-mode transformer. To confirm the suitability and usefulness of the proposed ACC, an experimental system including a 100-kHz SVPWM inverter was constructed and tested. The experimental results show that the proposed ACC can reduce the high-frequency component of the common-mode voltage.

A Decoupling Method for Current Regulation in Bearingless Motors Using AC Suspension Current Reviewed

Kimio Hijikata, Nozomu Ando, Masatsugu Takemoto, Satoshi Ogasawara

2014 17TH INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2310 - 2314 2014

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

this paper introduces a novel decoupling method for current regulation in high-speed bearingless motors using AC suspension current. The frequency of the suspension current increases in proportion to rotating speed in the bearingless motors using AC suspension current, and regulating the suspension current is difficult at high speeds rotation. In previous research, a current regulation method is used that convert AC to DC using a rotating coordinate system. However, that method has interference voltages which make the system unstable. In this paper, we propose a novel decoupling method for the suspension current regulation. In the experiment, stable levitation of the bearingless motor is achieved at 30000 min(-1) by using the proposed decoupling controller.

Consideration of 10kW In-Wheel Type Axial-Gap Motor Using Ferrite Permanent Magnets Reviewed

Kodai Sone, Masatsugu Takemoto, Satoshi Ogasawara, Kenichi Takezaki, Wataru Hino

2014 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-HIROSHIMA 2014 - ECCE-ASIA) 3525 - 3531 2014

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

In general, the in-wheel type permanent magnet synchronous motor (PMSM) for electric city commuters uses powerful rare earth permanent magnets (PMs). However, the employment of the rare earth PMs should be reduced due to high prices. Therefore, it is important to develop an in-wheel PMSM that does not use the rare earth PMs. We proposed 5kW in-wheel type axial gap motor that can generate high torque density and has features such as a coreless rotor structure with ferrite PMs and a reduction gearbox in the inner side of the stator. And we have presented details of experimental results on a prototype. So, in this paper, in order to achieve further higher power output, we considered a 10 kW in-wheel motor with the proposed structure. The motor with 10-kW output was examined by means of using 3D-FEM and experimental results in order to attain the further higher power as a rare earth free motor.

Verification of a Novel 5-axis Active Control Type Bearingless Canned Motor Pump Utilizing Passive Magnetic Bearing Function for High Power Reviewed

Kazuya Miyamoto, Masatsugu Takemoto, Satoshi Ogasawara, Masao Hiragushi

2014 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 2454 - 2461 2014

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

A centrifugal pump that employs a bearingless motor with 5-axis active control has been developed. In this paper, a novel bearingless canned motor pump is proposed, and differences from the conventional structure are explained. A key difference between the proposed and conventional bearingless canned motor pumps is the use of passive magnetic bearings; in the proposed pump, the amount of permanent magnets (PMs) is reduced by 30% and the length of the rotor is shortened. Despite the decrease in the total volume of PMs, the proposed structure can generate large suspension forces and high torque compared with the conventional design by the use of the passive magnetic bearings. In addition, levitation and rotation experiments demonstrated that the proposed motor is suitable for use as a bearingless canned motor pump.

A Feedback-Type Dead-Time Compensation Method for High-Frequency PWM Inverters with Low Distortion and High Voltage Utiliazation Factor Characteristics Reviewed

OGAWA Masashi, OGASAWARA Satoshi, TAKEMOTO Masatsugu

IEEJ Transactions on Industry Applications 133 ( 10 ) 970 - 977 2013.10

Language：Japanese Publisher：一般社団法人電気学会

This paper proposes a new feedback-type dead-time compensation method. The proposed method compensates the output voltage by employing two operations. First, the normal compensation matches the width of the output pulse to that of the input pulse with reduced delay time from the input pulse to the output pulse compared with the conventional method. Second, the short pulse compensation generates an output pulse after a few pulses are input so that the average value of the output signal equals that of the input signal. The voltage utilization factor of the proposed method is almost 100%, because there is no limit to the compensation and the decrease in the fundamental output caused by dead time is eliminated. The experimental results using a 100-kHz input signal show that there is no discrepancy between the output pulse width and the input pulse width. Furthermore, the THD of the compensated output current, when the output frequency is 50Hz, is eliminated, compared with that of the output current without compensation. These results show that the proposed method has low distortion and high voltage utilization factor characteristics.

DOI： 10.1541/ieejias.133.970

A Study of Simulation Methods Suitable for Real-Time Simulators Reviewed

KUBO Yuki, OGASAWARA Satoshi, TAKEMOTO Masatsugu

IEEJ Transactions on Industry Applications 133 ( 7 ) 714 - 720 2013.7

Language：Japanese Publisher：一般社団法人電気学会

This paper proposes simulation methods based on the forward Euler method that are suitable for real-time simulators. However, real-time simulation using the forward Euler method has the following problems: A simulation error caused by a time step limitation and a delay in the simulated waveforms. The authors have proposed a simulation method suitable for real-time simulators, but the physical meaning of the state variables is diluted by diagonalization of the system matrix. This paper proposes a simulation method to obtain the same characteristics as the previous method, without diagonalization. Off-line and real-time simulation results demonstrate the validity and usefulness of the proposed simulation method.

DOI： 10.1541/ieejias.133.714

Experiments for a Prototype Machine with Proposed High Power Structure in a 5‐axis Active Control Type Bearingless Canned Motor Pump Reviewed

松崎達也, 土方規実雄, 宮本和弥, 竹本真紹, 小笠原悟司, 平櫛真男

日本AEM学会誌 21 ( 2 ) 196 - 202 2013.6

Language：Japanese Publisher：The Japan Society of Applied Electromagnetics and Mechanics

A bearingless motor is characterized by integration of an electrical motor and a magnetic bearing. Electromagnetic force generated by the magnetic bearing function can realize magnetic suspension of a rotor shaft without mechanical contacts. Principal authors have been proposing a non-contact canned motor pump using the bearingless motor. This pump has no expendable parts, such as shaft seals, mechanical bearings and lubricant. Therefore, it can realize next advantages; 1. clean liquid sending. 2. maintenance free 3. longer operating life. 4. high chemical resistance. The previous paper has proposed novel structure which can generate high output and high suspension force compared with conventional structure. A prototype bearingless canned motor pump with the proposed high power structure is produced, and characteristics of suspension force and torque is tested in the prototype machine. This paper introduces the experimental results of the prototype machine with the proposed high power structure in detail.

DOI： 10.14243/jsaem.21.196

Operation Characteristics of Ferrite Permanent Magnet In-Wheel Axial-Gap Motor with Coreless Rotor Structure for Electric City Commuters Reviewed

Kodai Sone, Masatsugu Takemoto, Satoshi Ogasawara, Kenichi Takezaki, Wataru Hino

2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3186 - 3193 2013

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

Small electric vehicles called city commuters are used for commuting and traveling short distances within cities. These vehicles have been extensively researched and developed because of their high environmental performance and small battery size. The in-wheel permanent magnet synchronous motor (PMSM) for electric city commuters generally utilizes powerful rare earth permanent magnets (PMs). However, the employment of rare earth PMs should be reduced, owing to increasing prices and export restrictions on rare earth materials, making it necessary to develop an in-wheel PMSM that does not use rare earth PMs. We propose a ferrite PM-type axial gap motor that generates high torque density and has features such as a coreless rotor structure and a reduction gearbox on the inner side of the stator. Detailed operational characteristics of the proposed motor remain unverified by experiment, so this paper presents such operational characteristics as obtained from experimentation on a prototype.

Measurement of Resistance Characteristics of Power Cables in the Very High Frequency Band for Improving Electromagnetic Interference Analysis Reviewed

Yutaro Fujimori, Satoshi Ogasawara, Masatsugu Takemoto

2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 903 - 908 2013

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

This paper focuses on the resistance characteristics of power cables in the very high frequency (VHF) band. The resistance characteristics have a significant influence on radiative electromagnetic interference (EMI). However, to the authors' knowledge, as yet there have been no reports regarding the resistance characteristics of power cables in the VHF band. This paper proposes a measurement method based on distributed constant circuit theory and impedance matching theory. By using this method, the resistance characteristics for a single-core wire with polyvinyl chloride insulation are measured in the frequency range from 10 to 100 MHz. The experimental results show that the measured values of the cable resistance are more than 10-fold the theoretical values calculated by taking the skin effect into account, which are often used in EMI analysis and simulation. Furthermore, the measured values are proportional to the frequency raised to a power of approximately 2/3, whereas the theoretical values are proportional to the square root of the frequency. The measured resistance is validated by simulation using the 3D electromagnetic analysis software EMC Studio.

Rotor Structure in 50 kW Spoke-Type Interior Permanent Magnet Synchronous Motor with Ferrite Permanent Magnets for Automotive Applications Reviewed

Wataru Kakihara, Masatsugu Takemoto, Satoshi Ogasawara

2013 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 606 - 613 2013

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

In light of global warming and the rapidly increasing prices of rare earths, electric vehicles with motors free of rare earths are needed. We are therefore developing an interior permanent magnet synchronous motor (IPMSM) that utilizes ferrite permanent magnets. Because the residual flux density of a ferrite magnet is lower than that of a rare earth magnet, we have adopted a spoke-type IPMSM with radially arranged ferrite magnets. This paper proposes two rotor structure designs for spoke-type IPMSMs with ferrite magnets, and presents the results of two-dimensional finite element analysis (FEA) for the two designs. The results indicate that the performance loss from using ferrite magnets can be moderated by effectively utilizing reluctance torque in a spoketype IPMSM. Finally, a rotor structure that has sufficient performance to be usable in a traction motor free of rare earths is examined through experiments on a prototype and three-dimensional FEA.

Novel PWM Scheme with Multiphase SVPWM for Reducing Current Ripple Reviewed

Minglei Gu, Satoshi Ogasawara, Masatsugu Takemoto

2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 652 - 657 2013

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

This paper proposes a novel pulse width modulation (PWM) scheme for multiphase space vector pulse width modulation (MSVPWM), which is used in sensorless control of interior permanent-magnet synchronous motor drives. The estimation of the rotor position is based on magnetic saliency and employs high-frequency components of voltage and current which are excited by a MSVPWM pattern. The difference between the instantaneously applied voltage vector and the reference voltage vector causes current ripples. Since six active voltage vectors are generated during a PWM period, the sequences of the six error voltage vectors lead to different types of current ripples. In this paper, the proposed PWM scheme employs six sequences based on angle range to reduce line current ripple. Experimental results confirm that the proposed PWM scheme leads to significant reduction in harmonic current while maintaining high performance of sensorless estimation despite the reduced current ripple.

Non-Linear Common-Mode Equivalent Circuit for Inverter-Fed Motor Drive Systems Reviewed

Yizhanyi Tang, Satoshi Ogasawara, Masatsugu Takemoto

2013 IEEE ECCE ASIA DOWNUNDER (ECCE ASIA) 278 - 284 2013

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

This paper presents a discussion on common-mode (CM) electromagnetic interference (EMI) in an inverter-fed motor drive system, and proposes a non-linear CM equivalent circuit. The effectiveness and necessity of the non-linear element introduction are confirmed.

Ferrite-Magnet Spoke-Type IPMSM with W-Shaped Magnet Placement Reviewed

Kazuya Chiba, Masatsugu Takemoto, Satoshi Ogasawara, Woo Gyong Yim

39TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2013) 2869 - 2874 2013

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

Rare earth magnets that have a large energy product are generally used in high-efficiency interior permanent-magnet synchronous motors (IPMSMs). However, efficient rare-earth-free motors are needed because of problems such as the high prices of and export restrictions on rare earth materials. This paper introduces a ferrite-magnet spoke-type IPMSM that employs a W-shaped magnet placement in order to achieve high efficiency. The effectiveness of the W-shaped magnet placement is verified from the results of two-dimensional finite element analysis and experiments on a prototype.

An Inductance Estimation Method for Sensorless IPMSM Drives Based on Multiphase SVPWM Reviewed

Minglei Gu, Satoshi Ogasawara, Masatsugu Takemoto

2013 1ST INTERNATIONAL FUTURE ENERGY ELECTRONICS CONFERENCE (IFEEC 2013) 646 - 651 2013

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

This paper proposes an inductance-based estimation method for sensorless interior permanent magnet synchronous machine drives. Rotor position estimation is based on magnetic saliency and employs high-frequency components of voltage and current excited by a multiphase space vector pulse width modulation pattern. Unique to this method is that not only the rotor position but also the inductance parameter values can be estimated instantaneously during a period of modulation. Since inductance is an essential parameter for magnet polarity identification and maximum torque per ampere control, this paper presents the principles and performance results of the proposed inductance estimation method. Experimental results confirm that the proposed method is reliable, real-time, accurate, and convenient.

Magnetic Properties of High Si Steel Sheet and Its Application to Rare Earth Free Motor Reviewed

Yoshihiko Oda, Tatsuhiko Hiratani, Akira Chiba, Nobukazu Hoshi, Masatsugu Takemoto, Satoshi Ogasawara

TETSU TO HAGANE-JOURNAL OF THE IRON AND STEEL INSTITUTE OF JAPAN 98 ( 12 ) 823 - 828 2012.12

Consideration of Number of Series Turns in Switched-Reluctance Traction Motor Competitive to HEV IPMSM Reviewed

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

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 48 ( 6 ) 2333 - 2340 2012.11

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

This paper shows a winding design consideration of a 50-kW switched-reluctance motor (SRM) for hybrid-electric-vehicle (HEV) applications. Increasing the number of turns in stator windings is effective in reducing the maximum current; thus, the inverter current rating is reduced. However, motor output power falls significantly at high speed because of the increased back electromotive force. Continuous current operation can enhance output power at high rotational speed. In this operation, phase current is increased, and hence, the motor output power is maintained at high rotational speed. However, continuous current operation results in a decrease in efficiency. Thus, there is a trade-off in selecting the number of series turns. In this paper, two SRMs are constructed with the same dimensions, and their performance results, i.e., torque and efficiency ranges, are compared with those of the automotive industry standard interior-permanent-magnet motor for HEV applications.

DOI： 10.1109/TIA.2012.2227093

A Ferrite PM In-Wheel Motor Without Rare Earth Materials for Electric City Commuters Reviewed

Sone Kodai, Takemoto Masatsugu, Ogasawara Satoshi, Takezaki Kenichi, Akiyama Hidekatsu

IEEE TRANSACTIONS ON MAGNETICS 48 ( 11 ) 2961 - 2964 2012.11

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

Electric city commuters are vehicles used for commuting from suburbs to inner cities and for movement within cities. Because of the short distances that they cover and their small battery size, such vehicles are beginning to attract attention. Generally, a high-performance permanent magnet (PM) composed of rare earth elements, such as neodymium and dysprosium, is used in the in-wheel PM synchronous motor (PMSM) of an electric city commuter. However, rising prices of rare earth elements and export restrictions on them are serious problems. Development of an in-wheel PMSM that does not utilize rare earth PMs is therefore highly desirable for electric city commuter vehicles. Accordingly, our research group has focused on a surface PM type axial gap structure that can achieve a high torque density and a short motor length in the axial direction. The designed motor structure with ferrite PMs replacing the rare earth PMs and the results of a 3-D finite element analysis are introduced in detail in this paper. Moreover, to examine the fundamental characteristics of the designed motor, a prototype is produced and tested.

DOI： 10.1109/TMAG.2012.2196685

A Comparison between Two Types of High Torque and High Efficiency 50-kW SRMs Designed for HEVs Reviewed

TAKENO Motoki, CHIBA Akira, HOSHI Nobukazu, TAKEMOTO Masastugu, OGASAWARA Satoshi

IEEJ Transactions on Industry Applications 132 ( 8 ) 842 - 848 2012.8

Language：Japanese Publisher：一般社団法人電気学会

Permanent magnets made of rare earth materials are used in interior permanent magnet synchronous motors (IPMSMs), which are major component of hybrid electric vehicles. The recent remarkable increase in the cost of rare earth materials is a major concern. A switched reluctance motor (SRM) without permanent magnets is one of the possible alternatives. Two types of SRMs have been designed with different materials. The SRMs have been investigated full loading tests. This paper reports a comparison between experimental and analysis results for the SRMs. The efficiency of both SRMs can exceed 90%, and the output power can be in excess of 50kW.

DOI： 10.1541/ieejias.132.842

Test Results and Torque Improvement of the 50-kW Switched Reluctance Motor Designed for Hybrid Electric Vehicles Reviewed

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

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 48 ( 4 ) 1327 - 1334 2012.7

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

A switched reluctance motor (SRM) has been developed as one of the possible candidates of rare-earth-free electric motors. A prototype machine has been built and tested. It has competitive dimensions, torque, power, and efficiency with respect to the 50-kW interior permanent magnet synchronous motor employed in the hybrid electric vehicles (Toyota Prius 2003). It is found that competitive power of 50-kW rating and efficiency of 95% are achieved. The prototype motor provided 85% of the target torque. Except 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. An improved design is attempted, and a new experimental switched reluctance machine is designed and built for testing. The results are given in this paper.

DOI： 10.1109/TIA.2012.2199952

Characteristic measurements of switched reluctance motor on prototype electric vehicle Reviewed

Takashi Imakawa, Kenta Chimata, Nobukazu Hoshi, Akira Chiba, Masatsugu Takemoto, Satoshi Ogasawara

2012 IEEE International Electric Vehicle Conference 2012.3

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