Faculty Profiles - TAKEMOTO Masatsugu

Papers - TAKEMOTO Masatsugu

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Suppression of High-Frequency DC- And AC-Side Common-Mode Currents in DC-Fed Motor Drive Systems Reviewed

Shotaro Takahashi, Satoshi Ogasawara, Masatsugu Takemoto

23rd International Conference on Electrical Machines and Systems, ICEMS 2020 783 - 788 2020.11

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

To reduce radiated electromagnetic interference (EMI) in a motor drive system with long power cables, it is necessary to suppress both high-frequency (HF) input- and output-side common-mode (CM) current. In a DC-fed motor drive system, due to stray capacitance between power devices and heat sink, it is difficult to suppress both HF DC- and AC-side CM current by using only the conventional AC-side passive EMI filter. In this paper, the authors investigate how to suppress both HF DC- and AC-side CM currents on a DC-fed motor drive system. To achieve the above purpose, the DC-fed motor drive system based on SiC-MOSFET is constructed and DC- and AC-side CM currents are measured and evaluated for each filter condition.

DOI： 10.23919/ICEMS50442.2020.9290991

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An Isolated AC/DC Converter Using a Matrix Converter: A Feedback Control Method Considering the Non-linearity of a Diode Rectifier Reviewed

Wataru Kodaka, Satoshi Ogasawara, Koji Orikawa, Masatsugu Takemoto, Hiroyuki Tokusaki

IECON 2020 The 46th Annual Conference of the IEEE Industrial Electronics Society 2020.10

Investigation of Enhancing Output Power Density in Ultra-High-Speed Motors with Concentrated Winding Structure Reviewed

Takayuki Iida, Masatsugu Takemoto, Satoshi Ogasawra, Koji Orikawa, Ikuya Sato, Hiroyuki Kokubun, Akio Toba, Masao Syuto

2020 IEEE Energy Conversion Congress and Exposition (ECCE) 2020.10

Investigation of Operational Characteristics and Efficiency Enhancement of an Ultrahigh-Speed Bearingless Motor at 100 000 r/min Reviewed

Yu Fu, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 56 ( 4 ) 3571 - 3583 2020.7

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

This article introduces the operational characteristics of an ultra-high-speed bearingless motor with 2-pole concentrated motor windings and 4-pole concentrated suspension windings. Experiments with a prototype machine indicate that iron loss is the largest component of losses in the proposed bearingless motor. Therefore, in order to reduce the iron loss, comparison of the experimental results and the 3D-FEM results is discussed. As a result, because it is turned out that iron loss of the switching frequency component accounts for a large proportion in total iron loss, a method of enhancing efficiency of the proposed bearingless motor by means of high switching frequency using SiC-MOSFET is examined. The experimental results with the examined method show that the prototype machine can attain the high efficiency of 94.3% at rated operation of 1.70 kW and 100,000 r/min in spite of including suspension input power for magnetic levitation. In addition, operational characteristics comparison of the bearingless motor at switching frequency of 40 kHz, 80 kHz and 120 kHz is discussed in detail.

DOI： 10.1109/TIA.2020.2986453

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Development Policy of SMC to Improve Efficiency of Axial Gap Motor Employing Coreless Rotor Structure Reviewed

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Tatsuya Saito, Tomoyuki Ueno

2020 INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES (ICEM), VOL 1 1644 - 1650 2020

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

In recent years, electric motors having flat shape are desired in order to minimize system size as well as enhancing the efficiency. Therefore, axial gap motors (AGMs) have attracted significant attention because they can achieve higher torque density in flat shape than that of conventional radial gap motors (RGMs). In general, AGMs employ the soft magnetic composite (SMC) for the stator core since they have three dimensional magnetic paths unlike RGMs. If AGMs employ the SMC which has low iron loss characteristic, the efficiency can be improved. On the other hand, the average torque is decreased because the SMC basically has tradeoff-relationship between the iron loss characteristic and the permeability. Hence, in this research, an AGM having coreless rotor structure that torque performance is not easily affected by the permeability of the SMC is proposed. In this paper, many virtual SMC materials which have different iron loss and permeability are considered for the proposed AGM employing the coreless rotor structure. Finally, suitable SMC characteristic to enhance the efficiency over a wide operating range is revealed by three-dimensional finite element analysis (3D-FEA).

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Examination of Enhancing Efficiency of Axial Gap Motor in High Speed and High Torque Region by Adopting Neodymium Bonded Magnet Reviewed

綱田錬, 竹本真紹, 小笠原悟司, 折川幸司, 齋藤達哉, 上野友之

電気学会論文誌 D 140 ( 12 ) 2020

Control of Three Phase to High Frequency Single Phase Matrix Converter Capable of High Power Factor Operation and Soft Switching Reviewed

小高渉, 小笠原悟司, 折川幸司, 竹本真紹, 徳崎裕幸

電気学会論文誌 D 140 ( 12 ) 2020

A study on the shape between the stator poles of a homopolar magnetic bearing integrated with four C-shaped cores Reviewed

Hao Sun, 竹本真紹, 小笠原悟司, 折川幸司

日本AEM学会誌 28 ( 4 ) 2020

Basics and Applications of Traction Motors for Electrically Driven Vehicles

竹本真紹

自動車技術 74 ( 12 ) 2020

Investigation of Development Policy of SMC Material for High Efficiency over a Wide Operating Range in Axial Gap Motors Having Coreless Rotor Structure Reviewed

綱田錬, 竹本真紹, 小笠原悟司, 折川幸司, 齋藤達哉, 榎園勇太, 上野友之

日本AEM学会誌 28 ( 2 ) 2020

Switching Control Method for Voltage-Source PWM Inverters to Eliminate Conduction Noise between Phases Reviewed

埴岡翔太, 家澤雅宏, 小笠原悟司, 竹本真紹, 折川幸司

電気学会論文誌 D 140 ( 12 ) 2020

Design of Main Circuit for an SiC-MOSFET Inverter Using a Thick Copper Multilayer PCB to Minimize Stray Inductance Reviewed

Ishikawa Kohsuke, Ogasawara Satoshi, Takemoto Masatsugu, Orikawa Koji

IEEJ Transactions on Industry Applications 140 ( 2 ) 89 - 98 2020

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

<p>Inverters using SiC or GaN power devices can achieve high frequency and high efficiency operation. To achieve high efficiency, the switching characteristics of these power devices are important because stray inductances in the main circuit of the inverter have a strong influence on the switching characteristics. To reduce switching loss and surge voltage, minimization of stray inductance in the main circuit is required for a high-frequency PWM inverter. This paper describes design guidelines for high-frequency inverters that achieve low inductance. The PCB design guideline on a thick multilayer PCB is derived from the inductance calculation using 3D-FEA. It is shown experimentally that the stray inductance of the designed PCB can be reduced to the same level as the inductance inside the power devices. Experimental results verify that a prototype can achieve high-speed switching and suppress a surge voltage. A load test is demonstrated to evaluate the main circuit efficiency in a half-bridge inverter at 100kHz.</p>

DOI： 10.1541/ieejias.140.89

Experimental Evaluation of the Relationship between Dimensional Dependencies of MnZn Ferrites and Filter Inductor Impedances Reviewed

Takahashi Shotaro, Ogasawara Satoshi, Takemoto Masatsugu, Orikawa Koji, Tamate Michio

IEEJ Transactions on Industry Applications 140 ( 6 ) 433 - 441 2020

Language：Japanese Publisher：The Institute of Electrical Engineers of Japan

<p>This study investigates the relationship between filter inductor impedance and dimensional resonance of MnZn ferrite. Experimental results clarify that multiple factors affect inductor impedance resonances. These can be classified into three factors: the inherent characteristics of a magnetic material, self-resonance due to winding stray capacitance, and winding that acts as a distributed constant line. Next, based on the measurement results, the dimensional dependencies of complex permeabilities (dimensional resonance) and the influence of dimensional resonance on inductor impedance are discussed in detail. Finally, this study verifies that the influence of dimensional resonance on complex permeability can be mitigated, and filter inductor impedance can be increased in the high frequency range by core lamination. All experiments are performed using off-the-shelf magnetic core products.</p>

DOI： 10.1541/ieejias.140.433

Basic Examination for a Hybrid Excitation Motor with a Field Winding on a Rotor Reviewed

仲沢龍翔, 竹本真紹, 小笠原悟司, 折川幸司

日本AEM学会誌 28 ( 3 ) 2020

Verification of Iron Loss Affected by Secondary Frequency in Multi-core Transformer for Frequency Multiplying Circuit Reviewed

Shogo Nishikawa, Koji Orikawa, Satoshi Ogasawara, Masatsugu Takemoto

2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 5248 - 5255 2020

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

This paper verifies the iron loss affected by the secondary frequency in the multi-core transformer for the frequency multiplying circuit. In the frequency multiplying circuit, the secondary frequency component also flows through the primary winding although the transformer is excited by the primary switching frequency, which is one-fifth of the secondary frequency. However, the influence of the secondary frequency to the iron loss of the multi-core transformer in the frequency multiplying circuit has not discussed sufficiently. In this paper, three conditions including a no-load test, a resonant test where the inductance of the secondary side is dominant, and a resonant test where the inductance of the primary side is dominant, are demonstrated in order to verify the influence of the secondary frequency to the exciting voltage and the magnetizing current, that is, the influence of the voltage drop on the primary winding to the iron loss. The iron loss of Mn-Zn ferrite (PC40, TDK) is measured by drawing B (magnetic flux density)-H (magnetic field intensity) curves under the switching frequency is around 200 kHz and the secondary frequency is around 1 MHz. Experimental results verified the increment of the iron loss is 5.1% when the inductance of the secondary side is dominant to the total resonant inductance compared to that in the no-load test. In addition, it is confirmed that the increment of the iron loss is increased by the amplitude of the secondary current. On the other hand, experimental results verified that the secondary frequency significantly affects to the iron loss when the inductance of the primary side is dominant to the total resonant inductance because the voltage drop due to the primary winding's parameters and the secondary frequency component in the primary current occurs. The increment of the iron loss is 35.9% compared to that in a no-load test. From these observations, this paper indicates that placing the resonant inductance at the secondary side is effective for suppressing the influence of the secondary frequency to the iron loss of the multi-core transformer for the frequency multiplying circuit.

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Resonant Frequency Tracking Control for a Linear Compressor with Assist Springs Reviewed

Takahiro Suzuki, Masaki Koyama, Syuhei Nagata, Wataru Hatsuse, Masatsugu Takemoto, Satoshi Ogasawara

2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 3016 - 3021 2020

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

This paper proposes a drive control method for a linear compressor driven by a linear motor. Generally, the efficiency of a linear motor itself is relatively lower than that of a rotational motor. However, higher efficiency should be achievable by adding assist springs and driving at the resonant frequency. We have developed a novel resonant frequency estimation method that calculates the phase difference between a supplied voltage and a mover position. Since the phase difference changes according to the drive frequency with respect to the resonant frequency, our method calculates the phase difference by using the arctangent of a Fourier coefficient, which controls the drive frequency to keep the phase difference at 90 degrees. Experimental results show that the proposed method can successfully track to the resonant frequency dynamically even if the mechanical condition is changed.

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Investigation of Enhancing Reluctance Torque of a Delta-Type Variable Flux Memory Motor Having Large Flux Barrier for EV/HEV Traction Reviewed

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Koji Orikawa

2020 IEEE ENERGY CONVERSION CONGRESS AND EXPOSITION (ECCE) 53 - 60 2020

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

Delta-type permanent magnet (PM) arrangement and extended flux barriers are very effective in improving magnetization characteristics of variable flux memory motors (VFMMs). However, the reluctance torque tends to be declined because of small q-axis inductance. Therefore, a conventional VFMM using above two methods needs larger load current for achieving required maximum torque than that of a target traction motor which is mounted in TOYOTA PRIUS 4th generation. Hence, this paper proposes rotor shape that can increase the reluctance torque in order to achieve required maximum torque by applying same load current as that of the target motor. Finally, the proposed VFMM whose reluctance torque is improved can generate the target maximum torque with smaller load current than that of the conventional VFMM. In addition, the proposed VFMM has smaller maximum magnetizing current compared to that of the conventional model, and the proposed VFMM also indicates higher efficiency than that of the target traction motor in high speed region.

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Position Sensor-less Resonant Frequency Estimation Method for Linear Compressor with Assist Springs Reviewed

Takahiro Suzuki, Masaki Koyama, Shuhei Nagata, Wataru Hatsuse, Masatsugu Takemoto, Satoshi Ogasawara

2020 INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES (ICEM), VOL 1 1206 - 1212 2020

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

Higher efficiency for a linear motor should be achievable by adding assist springs and driving the motor at the resonant frequency, even if the efficiency of the motor itself is relatively lower than that of a rotational motor. When using a linear motor with assist springs in a sealed chamber such as a compressor, it is difficult to install a position sensor in such an environment; thus, position sensor-less resonant frequency control is essential. This paper proposes a drive control method that realizes resonant frequency driving without a position sensor. The resonant frequency is estimated on the basis of the detected motor phase current, and the position is estimated using only the fundamental component of the current after removing the offset of the detected current with a high-pass filter. Experimental results show that the proposed method can successfully track the resonant frequency dynamically without a position sensor.

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Reduction of Stray Capacitance in an Inverter Main Circuit Using Multilayer Printed Circuit Boards Reviewed

Kohsuke Ishikawa, Satoshi Ogasawara, Masatsugu Takemoto, Koji Orikawa

2019 IEEE 4th International Future Energy Electronics Conference (IFEEC) 2019.11

A Proposal of Ultra-Flat Axial Gap Motor Employing C-type SMC Core Reviewed

Ren Tsunata, Masatsugu Takemoto, Satoshi Ogasawara, Tomoyuki Ueno, Tatsuya Saitoh

IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 2019.10

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Papers - TAKEMOTO Masatsugu