Faculty Profiles - DOKI, Shinji

Papers - DOKI, Shinji

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Position sensorless control of IPMSM in overall speed range by extended EMF Reviewed International journal

Nimura T., Doki S.

2019 21st European Conference on Power Electronics and Applications EPE 2019 Ecce Europe 2019.9

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：2019 21st European Conference on Power Electronics and Applications EPE 2019 Ecce Europe

We present the redefined Extended EMF, which is proportional to not only rotor speed but also high frequency injected signal. We propose smooth and simple overall speed range position estimation by only using the redefined Extended EMF without switching control method at all.

DOI： 10.23919/EPE.2019.8915377

Scopus

Analysis and Evaluation of Current Control System of PMSM with Time-Delay to Improve Parallelization for Implementation on Multi-core Precessors Reviewed International journal

Kim J., Seiya K., Edahiro M., Doki S.

2019 22nd International Conference on Electrical Machines and Systems, ICEMS 2019 2019.8

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：2019 22nd International Conference on Electrical Machines and Systems, ICEMS 2019

With the introduction of multi-core processors, high performance of the control system has become possible. However, the use of multicore is not enough because parallelization is difficult in systems with sequential algorithms, such as motor current control systems. This paper describes the utilization of time-delay to improve parallelism in multi-core implementations of motor control systems. In addition, we propose a method of analyzing and evaluating the effect of time-delay on the control performance according to the insertion location.

DOI： 10.1109/ICEMS.2019.8921506

Scopus

Sensor Fail-Safe of PMSM Current Control System By Utilizing Current And Position State Estimation Techniques Reviewed International journal

Hori S., Doki S.

2019 22nd International Conference on Electrical Machines and Systems, ICEMS 2019 2019.8

Along with the expansion of applic tions of PMSM, safety is required for PMSM drive systems. One of the concerns about the safety of the PMSM drive system is sensor failures. In this regard, we aim to make sensor systems redundant and improve fail-safe by using state estimation techniques. In this paper, propose a current control system of PMSM with sensor failsafe by utilizing the techniques and verify some fail-safe performance of the methods in simulation and experiment.

DOI： 10.1109/ICEMS.2019.8921898

Scopus

自律移動ロボットのロバストな位置推定のための相関係数による多数決センサ選択と統合 Reviewed Open Access

大橋臨,舟洞佑記,道木慎二,道木加絵

計測自動制御学会論文集 Vol. 55 ( 7 ) page： 439-446 2019.7

自律移動ロボットのロバストな位置推定のための相関係数による多数決センサ選択と統合 Reviewed Open Access

大橋臨, 舟洞佑記, 道木慎二, 道木加絵

計測自動制御学会論文集 Vol. 55 ( 7 ) page： 439-446 2019.7

座標変換器の離散化実装を考慮したPMSMのモデル化と提案モデルに基づく非干渉制御 Reviewed Open Access

井上雅理,道木慎二

電気学会論文誌D Vol. 139 ( 7 ) page： 637-644 2019.7

座標変換器の離散化実装を考慮したPMSMのモデル化と提案モデルに基づく非干渉制御 Reviewed Open Access

井上雅理, 道木慎二

電気学会論文誌D Vol. 139 ( 7 ) page： 637-644 2019.7

自動車の電動化における最新技術動向 Open Access

貝塚正明,立花武,小坂卓,道木慎二,太田豊

電気学会論文誌D Vol. 139 ( 6 ) page： 535-542 2019.6

自動車の電動化における最新技術動向 Reviewed Open Access

貝塚正明, 立花武, 小坂卓, 道木慎二, 太田豊

電気学会論文誌D Vol. 139 ( 6 ) page： 535-542 2019.6

Quantification of Contributing Degree to Braking Operation of Driver based on the Hidden Markov Model Reviewed International journal

Hashimoto K., Miyosawa T., Yamada T., Tsuchiya T., Doki K., Doki S.

IEEE International Symposium on Industrial Electronics Vol. 2019-June page： 1711 - 1716 2019.6

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：IEEE International Symposium on Industrial Electronics

In order to assist cognitive of driver, it is effective for driver to teach the objects that he should recognize in a visual way. However, it is expected that too much information is provided for a driver from the system and it cause him distraction. Therefore, information presentation without exaggeration and without omission is demanded for assistant system. In this paper, it is assumed that the objects which contribute to driver's braking operation should be presented to him. However, these objects changes according to the facing driving situation. Therefore, a selection method of these objects in the appeared objects model is desired. In this paper, a quantification method of contributing degree to braking operation is proposed to select object that system should present. In this method, the degree of contributing to braking operation is calculated based on a driving behavior model. This model express the relationship between the braking operation and time series features of the object that contributes to braking operation. Therefore, in this paper, the modeling method is also proposed.In the experiment, the modeled time series features of the objects that contribute to braking operation was evaluated based on the propose modeling method. Moreover, the calculated degree of contributing to braking operation based on the proposed method was evaluated by using driving simulator. As the results, it was confirmed that high detection accuracy of object that contributes to braking operation was confirmed.

DOI： 10.1109/ISIE.2019.8781518

Scopus

無人飛行体によるインフラ設備外観自動点検システムのための状態データの精度と作業効率を考慮した計測位置決定 Reviewed Open Access

麻晃太朗,舟洞佑記,道木慎二,道木加絵

計測自動制御学会論文集 Vol. 55 ( 5 ) page： 386-392 2019.5

無人飛行体によるインフラ設備外観自動点検システムのための状態データの精度と作業効率を考慮した計測位置決定 Reviewed Open Access

麻晃太朗, 舟洞佑記, 道木慎二, 道木加絵

計測自動制御学会論文集 Vol. 55 ( 5 ) page： 386-392 2019.5

A Current Harmonic Minimum PWM for Three-Level Converters Aiming at the Low-Frequency Fluctuation Minimum of Neutral-Point Potential Reviewed International journal Open Access

Guan Bo, Doki Shinji

IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS Vol. 66 ( 5 ) page： 3380 - 3390 2019.5

Design of band elimination filter for PMSM vector control operable in overmodulation region of inverter Reviewed International journal Open Access

Nakayama Yosuke, Doki Shinji

ELECTRICAL ENGINEERING IN JAPAN Vol. 207 ( 3 ) page： 45 - 56 2019.5

High-performance V/f control of PMSM using state feedback control based on n-t coordinate system Reviewed International journal Open Access

Matsuki Yosuke, Doki Shinji

ELECTRICAL ENGINEERING IN JAPAN Vol. 206 ( 4 ) page： 55 - 65 2019.3

High response torque control of IPMSM using state feedback control based on n-t coordinate system Reviewed International journal Open Access

Matsuki Yosuke, Doki Shinji

ELECTRICAL ENGINEERING IN JAPAN Vol. 206 ( 1 ) page： 51 - 62 2019.1

Optimal Two Degrees-of-Freedom Based Neutral Point Potential Control for Three-Level Neutral Point Clamped Converters Reviewed International journal

Guan Bo, Doki Shinji

JOURNAL OF POWER ELECTRONICS Vol. 19 ( 1 ) page： 119 - 133 2019.1

Analysis about control model for position sensorless control of pmsms based on expression of imaginary electromotive force Reviewed Open Access

Shota Kondo, Shinji Doki, Atsushi Matsumoto, Mutuwo Tomita

IEEJ Transactions on Industry Applications Vol. 139 ( 1 ) page： 1 - 12 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Institute of Electrical Engineers of Japan

There are many mathematical models for the position sensorless control of permanent magnet synchronous motors (PMSMs), and various position sensorless control methods have already proposed. However, it is necessary to select a control model according to the objective from characteristics of the EMF phase and the robustness against to the motor parameters. An Imaginary Electromotive Force (IEMF) expression can clarify the differences of these models. This paper discusses the characteristics of each model including the Extended Electromotive Force model for position sensorless control that can be applied to the standstill / low speed range from the middle / high speed range. Finally, we show that this IEMF expression is extremely useful in discussing and designing characteristics of the control models of PMSMs.

DOI： 10.1541/ieejias.139.1

Open Access

Scopus

Discrete-time PMSM Modeling including Park Transformation and Decoupling Control Based on the Proposed Model Reviewed

Inoue M., Doki S.

Ieej Transactions on Industry Applications Vol. 139 ( 7 ) page： 637 - 644 2019

Authorship：Last author Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Ieej Transactions on Industry Applications

This paper describes a new discrete-time PMSM model for the discrete design of current vector control systems. The discrete design of current control system minimizes the discretization error and improves the current control performance at the sampling point. The conventional PMSM model discretization method presumes that park transformation runs continuously. When the sampling frequency is considerably lower than the fundamental electric frequency, this assumption is invalid and the control performance will degrade due to modeling error. In this paper, the authors propose a method of PMSM model discretization considering discrete-time park transformation and design an additional cross-coupling compensator for the proposed model. The experimetntation results demonstrate the effectiveness of the proposed model.

DOI： 10.1541/ieejias.139.637

Scopus

Validation of control with contact force distribution for multi-joint wearable robot for body trunk assist Reviewed

Funabora Y., Uchiyama N., Doki S., Doki K.

Ieej Transactions on Electronics Information and Systems Vol. 139 ( 11 ) page： 1325 - 1332 2019

Language：Japanese Publishing type：Research paper (scientific journal) Publisher：Ieej Transactions on Electronics Information and Systems

In order to make a multi-joint wearable robot for assisting an user's motions on whole body trunk, this paper discusses the usefulness of control with contact force distribution between user and robot for ensuring the safety of the user. To ensure the safety with wearable assistive robots being different structure from the assisting part of the user, sensing and controlling contact force distribution applying to the user is desired. By utilizing the tactile pressure sensors on the robot's surface, the robot can measure physical contact force distribution as pressure distribution. In this paper, a control methodology based on general impedance control system with pressure distribution is presented. Then, the methodology is confirmed possibility to improve safety compared with conventional torque-base control methodology. In some basically simulations, the proposed control system can reduce power of maximum contact force applying to the user, indicating usability of contact force distribution information for improving safety of assist robots with different motions from assisting parts of the user.

DOI： 10.1541/ieejeiss.139.1325

Scopus

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Papers - DOKI, Shinji