Faculty Profiles - DOKI, Shinji

Presentations -

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Examination of Magnetization Curve Model for Torque Ripple Reduction of IPMSMs to Compensate for Magnetic Characteristics International conference

H. Akatsuka, M. Hasegawa, S. Doki

2020.11.24 IEEE

The Improvement of Initial Rotor Position Estimation Method with Extended-EMF Available at Overall Speed Range by Exciting with Speed and Signal Injection International conference

Takamasa Kozakura, Takumi Nimura, Shinji Doki

ICEMS 2020 2020.11.24 IEEE

Torque Ripple Reduction of IPMSM Considering Compensation of Nonlinearities of Magnetic Characteristics International conference

Hiroyasu Akatsuka, Masaru Hasegawa, Shinji Doki

IECON2020 2020.10.20 IEEE

Position Sensorless Control Method by Using Redefined Extended Electromotive Force for All-Speed-Range Drive of IPMSM and its Evaluation on Electric Vehicle International conference

Kentaro Kitamura, Takumi Nimura, Shinji Doki

ISIE2020 2020.6.17 IEEE

Variable Switching Frequency Control for Efficiency Improvement of Motor Drive System by Using GaN Three Phase Inverter International conference

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

2020 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT) 2020 Proceedings of the IEEE International Conference on Industrial Technology

Event date： 2020

Language：English Presentation type：Oral presentation (general)

This paper aims to propose a new traction motor control system for electric vehicles (EVs). EVs are required to have higher energy efficiency in motor control systems for cruising longer distance. However, motor control systems, which are generally equipped with Si-IGBT inverters, have limits of the energy efficiency. Therefore, new inverters, which use wide bandgap (WBG) semiconductor devices such as Gallium Nitride (GaN), are expected to be a solution to improve the energy efficiency. Having less energy loss in conducting and switching operation than Si-IGBT inverters, the GaN inverters can increase the switching frequency. In addition, the reduction of harmonic loss of the motors will enable us to improve the energy efficiencies of the entire motor control system. Although previous researches have demonstrated the performance of various inverters, the experiments demonstrated only inverters of small capacities that are insufficient to be applied in traction motor control of EVs. Then, our research group are challenging to increase the power of GaN inverters and to realize their practical application to compact EVs. In this research, the switching frequency of the GaN inverter was dynamically changed to verify the higher energy efficiency of the motor control system. The results of the experiment have shown that the total energy efficiency can be improved by up to about 1.5% and the total loss can be reduced by up to about 10%.

DOI： 10.1109/ICIT45562.2020.9067266

Scopus

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

Wang, S; Imai, K; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

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

Suzuki, T; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

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

Kim, J; Kato, S; Honda, S; Edahiro, M; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

Examination of Current Sensor Fail-Safe of PMSM current control system which using current and position state estimation techniques International conference

Hori, S; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

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

Kato, S; Tomita, M; Hasegawa, M; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

Torque Ripple Reduction of IPMSM Considering Compensation of Nonlinearities of Magnetic Characteristics International conference

Akatsuka, H; Hasegawa, M; Doki, S

IECON 2020: THE 46TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY 2020 IECON Proceedings (Industrial Electronics Conference)

Event date： 2020

Language：English Presentation type：Oral presentation (general)

This paper proposes a torque ripple estimation and reduction of IPMSM with concentrated winding considering nonlinearity of magnetization characteristics. First, the proposed torque ripple estimation method which ignores nonlinearities such as magnetic saturation and cross-coupling is derived and some problems of this approach are presented. Then, the torque ripple estimation method considering nonlinearity of magnetization characteristics is proposed, in which this approach is based on simple approximations of the magnetization curve. After that, a torque ripple reduction is proposed, which are based on the adaptive identification of the equivalent torque coefficient. Finally, the performance of the proposed method is experimentally evaluated to show the feasibility of the proposed method.

DOI： 10.1109/iecon43393.2020.9254577

Scopus

Three-dimensional Deformation Control System for Fabric Actuator International conference

Yamaguchi, H; Funabora, Y; Doki, S; Doki, K

2020 IEEE/SICE INTERNATIONAL SYMPOSIUM ON SYSTEM INTEGRATION (SII) 2020

The improvement of initial rotor position estimation method with Extended-EMF available at overall speed range by exciting with speed and signal injection International conference

Kozakura, T; Nimura, T; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

Servo Brake Control based on Finite Control Set-Model Predictive Control with a Voltage Smoother International coauthorship International conference

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

2020 IEEE 2ND GLOBAL POWER, ENERGY AND COMMUNICATION CONFERENCE (IEEE GPECOM2020) 2020

Examination of Magnetization Curve Model for Torque Ripple Reduction of IPMSMs to Compensate for Magnetic Characteristics. International conference

Akatsuka, H; Hasegawa, M; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

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

Kitamura, K; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

Position Sensorless Control Method by Using Redefined Extended Electromotive Force for All-Speed-Range Drive of IPMSM and its Evaluation on Electric Vehicle International conference

Kitamura, K; Takumi, N; Doki, S

2020 IEEE 29TH INTERNATIONAL SYMPOSIUM ON INDUSTRIAL ELECTRONICS (ISIE) 2020 IEEE International Symposium on Industrial Electronics

Event date： 2020

Language：English Presentation type：Oral presentation (general)

This paper presents evaluation of position sen-sorless control method by redefined Extended Electromotive Force (EEMFω+h) for All-speed-range on Electric Vehicle(EV). Pposition sensorless control is one of the significant research concern for IPMSM in terms of lowering cost, saving installation space and improvement of reliability. A previous research that redefined EEMF for all-speed-range drive and proposed a method to estimate (EEMFω+h) excited by signal injection and speed to realize all speed estimation has been conducted. In order to expand application examples, an EV is remodeled and implemented this method, and finally this method is evaluated in various running experiments in this paper.

DOI： 10.1109/isie45063.2020.9152459

Scopus

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

Wang, S; Imai, K; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

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

Kim, J; Kato, S; Honda, S; Edahiro, M; Doki, S

2020 23RD INTERNATIONAL CONFERENCE ON ELECTRICAL MACHINES AND SYSTEMS (ICEMS) 2020

過変調領域まで動作可能な永久磁石同期モータのベクトル制御系 Invited

道木慎二

JSAE SYMPOSIUM 車載用パワーエレクトロニクスの最新技術 2019.10

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<DOKI, Shinji>

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