Faculty Profiles - DOKI, Shinji

Presentations -

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全速度域で利用可能な拡張誘起電圧における新たな極性判別法の電気自動車への実装と性能評価

渡辺拓誠, 小櫻崇雅, 北村健太郎, 道木慎二

令和3年電気学会全国大会 2021.3.9 電気学会

モータ制御システムのマルチコア実装における並列度と制御性能両立に向けた遅延挿入箇所の探索方法

Jinsoo KIM, 寒河江翔太, 加藤聖也, 枝廣正人, 道木慎二

令和3年電気学会全国大会 2021.3.9 電気学会

高周波電流制御を用いたSynRMの低速時の位置センサレス制御におけるインダクタンス誤差の影響

林立喜, 國枝武史, 冨田睦雄, 長谷川勝, 道木慎二

令和3年電気学会全国大会 2021.3.9 電気学会

位置推定と極性判別を同時に行う永久磁石同期モータの始動時磁極位置推定法の性能向上

小櫻崇雅, 道木慎二

令和3年電気学会全国大会 2021.3.11 電気学会

永久同期電動機のセンサレスベクトル制御 Invited

道木慎二

産業応用フォーラム「「ACドライブシステムのセンサレスベクトル制御～基礎から実装，応用例まで～」」 2021.2.1 電気学会

Application of Variable Carrier Frequency Control by Using Wide Bandgap Semiconductors Inverter for WLTC Mode Driving International conference

Hori, S; Kanazawa, Y; Akatuka, H; Wang, S; Doki, S; Tadano, H; Shiozaki, K

2021 22ND IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT) 2021 Proceedings of the IEEE International Conference on Industrial Technology

Event date： 2021

Language：English Presentation type：Oral presentation (general)

This paper aims to propose a control method of a high efficiency electric vehicles(EVs) drive motor and to verify its effectiveness. One of the ways to extend the driving distance is to improve the efficiency of the motor control system. However, existing motor control systems which use Si-IGBT inverters have limitations in terms of efficiency due to device restrictions. New inverters using wide bandgap (WBG) semiconductors such as Gallium Nitride (GaN) are being investigated to improve the efficiency. The advantages of a GaN inverter are the lower conduction and switching losses than a Si-IGBT inverter and the higher switching frequency. If the switching frequency is increased, the motor harmonic loss as well as the whole loss in the motor control system can be reduced. However, most of the existing research have focused on small capacity modules, which are not sufficient to study the motor control system of EVs. Therefore, our research group has been working on improving the GaN inverter to realize a compact EV. We are investigating variable carrier frequency control as a control method to make WBG semiconductors more useful. In this paper, a variable carrier frequency control is applied to a motor control system using GaN and SiC inverters, and we discuss the usefulness of wide bandgap semiconductors for electric vehicles by measuring the loss in WLTC mode with the systems. The experimental results show that the application of variable carrier frequency control to the motor control system with SiC inverter reduces the loss in WLTC mode by up to about 6% compared to the conventional control method.

DOI： 10.1109/ICIT46573.2021.9453618

Scopus

A Novel Decoupling Control of Dual Three Phase Drive with Two Independent Microprocessors Utilizing Current Observer International conference

Wang, S; Kitamura, K; Doki, S; Suzuki, T

2021 THIRTY-SIXTH ANNUAL IEEE APPLIED POWER ELECTRONICS CONFERENCE AND EXPOSITION (APEC 2021) 2021 Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC

Event date： 2021

Language：English Presentation type：Oral presentation (general)

A novel decoupling control scheme of a Dual Three Phase (DTP) Permanent Magnet Synchronous Motor (PMSM) drive with two microprocessors applying current observer is proposed in this work. Multiphase drives are considered as a viable solution for safety-critical applications, and substantial works have been conducted for this purpose. However, it should be noted that for a fault-tolerant drive, not only the machine itself should be considered, but also control executed Microcontroller Unit (MCU) Therefore, a novel configuration of an integrated fault tolerant DTP drive with two independent MCUs has become the interest of this paper. Magnetic coupling between winding sets is a big issue causing instability and dynamic deterioration. In order to implement decoupling current vector control on this particular system, an observer that estimates the other subsystem output current is proposed and utilized. Effectiveness of the proposed drive has been verified by experimental results.

DOI： 10.1109/APEC42165.2021.9487432

Scopus

Application of Augmented Reality based on Sensing Data to Teleoperation System for Operator Support International conference

Doki, K; Suzuki, K; Torii, A; Mototani, S; Funabora, Y; Doki, S

2021 22ND IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT) 2021 Proceedings of the IEEE International Conference on Industrial Technology

Event date： 2021

Language：English Presentation type：Oral presentation (general)

In this paper, we propose a new system for operator support in teleoperation using Augmented Reality(AR) based on sensing data. In the proposed system, an 360-degree camera is equipped with a mobile machine in a remote place which is controlled by an operator, and the captured 360-degree image is displayed to the head mounted display put on the head of the operator. The operator can control the machine smoothly by watching what he needs for his current task by turning his head. In addition, the provided image around the machine has no blind spot because of the 360-degree image. However, a large transfer delay or a dropped frame occurs due to the enormous data size of the 360-degree image, which adversely influences the operator performance. In order to solve this problem, the AR image is actually provided to the operator, in which CG objects generated based on other sensor information are superimposed on the 360-degree image as AR objects. In this paper, the usefulness of the proposed method is shown through the experimental results on obstacle avoidance of a mobile robot by teleoperation.

DOI： 10.1109/ICIT46573.2021.9453619

Scopus

Capacitor Current Reduction of Double Three Phase PMSM Drive System by Real-time MPC International conference

Suzuki, A; Doki, S; Imai, K; Aoki, Y; Kondo, K

IECON 2021 - 47TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY 2021 IECON Proceedings (Industrial Electronics Conference)

Event date： 2021

Language：English Presentation type：Oral presentation (general)

This paper proposes a capacitor current reduction method using real-time model predictive control (MPC) for a double three-phase permanent magnet synchronous motor (DTPPMSM) drive system. Capacitor current reduction for volume minimization of DTP-PMSM drive system is important issue. Optimizing switching timings by MPC is promising approach. However, it is difficult to implement ideal MPC in a real system because it requires a huge amount of calculation to predict the capacitor current. In this paper, we propose a new method that is possible to search optimal switching timing for reducing the capacitor current by using the MPC, whose calculation amount can be implemented in real-time. This paper shows the possibility of realizing an capacitor current reduction method with high control performance by reducing the amount of computation for MPC.

DOI： 10.1109/IECON48115.2021.9589070

Scopus

Effects of Inductance Error on Position Sensorless Control of Synchronous Reluctance Motor at Low Speeds Using High-Frequency Current Controller International conference

Tatsuki Hayashi, Koki Kataoka, Mutuwo Tomita, Masaru Hasegawa, Shinji Doki

2021 IEEE Industrial Electronics and Applications Conference (IEACon) 2021 IEEE

AR video presentation using 3D LiDAR information for operator support in mobile robot teleoperation International conference

Doki, K; Suzuki, K; Torii, A; Mototani, S; Funabora, Y; Doki, S

2021 IEEE 19TH WORLD SYMPOSIUM ON APPLIED MACHINE INTELLIGENCE AND INFORMATICS (SAMI 2021) 2021

Model Predictive Current Control of PMSM drives for Achieving both Fast Transient Response and Ripple Suppression International conference

Kawai, H; Cordier, J; Kennel, R; Doki, S

IECON 2021 - 47TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY 2021

GNSS で飛行する構造物点検用 UAV 群における GNSS と相対計測情報の統合による位置推定のロバスト化

木村圭佑, 舟洞佑記, 道木慎二, 道木加絵

第21回計測自動制御学会システムインテグレーション部門講演会 2020.12.17 計測自動制御学会　システムインテグレーション部門

視線情報に基づく拡張現実感映像による遠隔運転支援システム

鈴木建哉, 道木加絵, 舟洞佑記, 道木慎二, 鳥井昭宏. 元谷卓

第21回計測自動制御学会システムインテグレーション部門講演会 2020.12.18 計測自動制御学会　システムインテグレーション部門

Position Sensorless Estimation for Surface Permanent Magnet Synchronous Motor Using Eddy Current International conference

Soma Kato, Mutuwo Tomita, Masaru Hasegawa, Shinji Doki

ICEMS 2020 2020.11.27 IEEE

A Study on the Implementation of Vector Control System Using the Model Base Parallelization Tool on Multi-Core Processor International conference

Jinsoo Kim, Seiya Kato, Shinya Honda, Masato Edahiro, Shinji Doki

ICEMS 2020 2020.11.27 IEEE

A Novel Decoupling Control Scheme for Dual Three Phase Motors International conference

Shen Wang, Koji Imai, Shinji Doki

ICEMS 2020 2020.11.26 IEEE

Examination of Current Sensor Fail-Safe of PMSM Current Control System which Using Current and Position State Estimation Techniques International conference

Shota Hori, Shinji Doki

ICEMS 2020 2020.11.25 IEEE

Control Method that Reduces the High Harmonic in Overmodulation Drive of Dual Winding Motor under Condition of Voltage Supplies Unbalance International conference

Takashi Suzuki, Shinji Doki

ICEMS 2020 2020.11.25 IEEE

Performance Evaluation of Position Sensorless Control by Using Extended Electromotive Force Including Overmodulation Region on Electric Vehicle International conference

Kentaro Kitamura, Shinji Doki

ICEMS 2020 2020.11.25 IEEE

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<DOKI, Shinji>

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