Faculty Profiles - DOKI, Shinji

Papers - DOKI, Shinji

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EEMFs Excited by Signal Injection for Position Sensorless Control of PMSMs and Their Performance Comparison by Using Imaginary Electromotive Force Reviewed International journal

Nimura Takumi, Kondo Shota, Doki Shinji, Tomita Mutuwo

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 1295-1300 2018

Prototype of Wearable Robot with Tactile Sensor Measurable Contact Force Distribution with User Reviewed International journal

Ito Daiki, Funabora Yuki, Doki Shinji, Doki Kae

2018 15TH INTERNATIONAL CONFERENCE ON CONTROL, AUTOMATION, ROBOTICS AND VISION (ICARCV) page： 960-965 2018

Position Sensorless Control for Wound-Field Synchronous Motor with Double Three-phase Wound Stator Using Extended Electromotive Force Model Reviewed International journal

Imai Koji, Doki Shinji, Fujii Kiyoshi, Jung Sukhawa

2018 IEEE INTERNATIONAL CONFERENCE ON INDUSTRIAL TECHNOLOGY (ICIT) page： 492-497 2018

Position Sensorless Control based on Pattern Matching Method using Multiple Template Data Sets to Improve Position Control Error Reviewed International journal

Song Hamin, Doki Shinji

2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE) page： . 2018

PMSM Model Discretization in Consideration of Park Transformation for Current Control System Reviewed International journal

Inoue Masamichi, Doki Shinji

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 1228-1233 2018

New Search Algorithm of Model Predictive Control to Reducing Calculation Amount for Improving Steady Current Control Performance Reviewed International journal

Shimaoka Masahiro, Doki Shinji

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 1747-1751 2018

Maximum Torque Control Reference Frame Based on a Torque Map for IPMSMs with Large Inductance Variation Reviewed International journal

Ohta Kazuki, Ohnuma Takumi, Doki Shinji

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 1223-1227 2018

Initial Position Error Convergence of Position Sensorless Control of PMSM by using Extended Electromotive Force Excited by Signal Injection Reviewed International journal

Nimura Takumi, Kondo Shota, Doki Shinji, Tomita Mutuwo

2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE) page： . 2018

Majority Rule Sensor Fusion System with Particle Filter for Robust Robot Localization Reviewed International journal

Ohashi Nozomu, Funabora Yuki, Doki Shinji, Doki Kae

2018 IEEE/ASME INTERNATIONAL CONFERENCE ON ADVANCED INTELLIGENT MECHATRONICS (AIM) page： 1106-1111 2018

Improvement in Control Performance of PMSMs by Deactivation of Antiwindup Control in the Overmodulation Range of an Inverter Reviewed International journal

Nakayama Yosuke, Doki Shinji

2018 20TH EUROPEAN CONFERENCE ON POWER ELECTRONICS AND APPLICATIONS (EPE'18 ECCE EUROPE) page： . 2018

High Stability V/f Control of PMSM Using State Feedback Control Based on n-t Coordinate System Reviewed International journal

Matsuki Yosuke, Doki Shinji

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 2224-2228 2018

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

Matsuki Y., Doki S.

IEEJ Transactions on Industry Applications Vol. 138 ( 12 ) page： 911 - 919 2018

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

This paper proposes a new V/f control method for permanent magnetic synchronous motors (PMSMs) without a position sensor. The proposed method uses state feedback control based on an n-t coordinate system, and controls rotational speed and the voltage amplitude. The t-axis is a tangent line of a constant voltage ellipse, and the n-axis is a normal line of the ellipse. The t-axis current is utilized to place the poles of the transfer function at the desired position at low speed and high speed conditions. The effectiveness of the proposed method was verified by simulation and experimental results.

DOI： 10.1541/ieejias.138.911

Scopus

Flight Path Planning of Multiple UAVs for Robust Localization near Infrastructure Facilities Reviewed International journal

Maeda Keigo, Funabora Yuki, Doki Shinji, Doki Kae

IECON 2018 - 44TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY page： 2522-2527 2018

The Multiple Degree of Freedom based Neutral Point Potential Control of Three Level Neutral Point Clamped Converters Reviewed

Guan Bo, Doki Shinji

2018 INTERNATIONAL POWER ELECTRONICS CONFERENCE (IPEC-NIIGATA 2018 -ECCE ASIA) page： 1032-1037 2018

A dual-degrees of freedom based PWM for single phase three level rectifiers with a strong neutral point potential control ability Reviewed International journal

Guan B., Doki S.

Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society Vol. 2017-January page： 527 - 532 2017.12

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：Proceedings IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

For the discussion about the neutral point potential (NPP) control of single phase three-level rectifiers, most of the methods solve the NPP problem by adjusting the zero-sequence voltage under symmetrical load conditions. However, when one phase voltage reaches to the maximum voltage, the other phase voltage goes to the minimal voltage. As a result, the NPP control ability is limited since there is no chosen zero-sequence voltage when the modulation ratio is close to 1. It can not be suitable for some strong asymmetrical load applications, in which two DC-link capacitors are used to drive different loads separately. In this paper, a dual-degrees of freedom based PWM is proposed, which can enhance the NPP control ability for single phase three level rectifiers. Introducing a new degree of freedom, the proposed method has more choices for the NPP control. It can decrease the NPP fluctuation under the strong asymmetrical load conditions, compared with the traditional PWM methods. The simulation results ratify the correctness and feasibility of the proposed PWM method finally.

DOI： 10.1109/IECON.2017.8216093

Scopus

Measuring Position Determination for Accurate and Efficient Visual Inspection Using UAV Reviewed International journal

Asa Kotaro, Yuki Funabora, Shinji Doki, Kae Doki

Proc. of 2017 IEEE/SICE International Symposium on System Integration Vol. 2018-January ( ThA1.3 ) page： 188 - 193 2017.12

A novel neutral point potential balance control of three-level converters based on the search optimization method of dual degrees of freedom Reviewed International journal

Guan B., Doki S.

2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe Vol. 2017-January 2017.11

Authorship：Last author Language：English Publishing type：Research paper (international conference proceedings) Publisher：2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe

Even though the neutral point potential (NPP) balance problem of three-level neutral-point-clamped (NPC) converters can be solved by the traditional methods based on nearest-three-vectors (NTV) PWM, a low frequency fluctuation in the NPP will appear, which makes the capacitor reduction become hard. The dual modulation waves method is used to overcome the low frequency fluctuation, but it is an open-loop way, which will cause the drift voltage problem of the NPP and increase the switching frequency. Moreover, the control ability of the neutral point current is limited since the zero-sequence voltage is fixed. By removing the limit of the zero-sequence voltage and introducing a new degree of freedom, a novel NPP control of three-level NPC converters based on the search optimization is proposed in this paper. Fuzzing the boundary between the NTV-PWM and the dual modulation waves method, the proposed method realizes two modulations by a unified way. It can solve the low frequency fluctuation problem, reduce the switching frequency and extend the control ability of the neutral point current simultaneously by choosing the optimal dual degrees of freedom. Comparing the NTV-PWM, the dual modulation waves method and the proposed method, the simulation results verify the correctness and effectiveness of the proposed method.

DOI： 10.23919/EPE17ECCEEurope.2017.8098930

Scopus

A study on position sensorless control without any q-axis inductance by using Extended Electromotive Force with High frequency signal injection Reviewed International journal

Kondo S., Doki S., Tomita M.

2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe Vol. 2017-January page： P1 - P6 2017.11

Language：English Publishing type：Research paper (international conference proceedings) Publisher：2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe

This paper describes sensitivity analysis to q-axis inductance variation of the position estimation using Extended Electromitive Force (EEMF) excited by High Frequency (HF) signal injection based on the mathematical formula evaluation, and it shows that the influence on the q-axis inductance variation is very small. Finally, experimental results indicate that position estimation can be performed well without any q-axis inductance information.

DOI： 10.23919/EPE17ECCEEurope.2017.8099118

Scopus

Frequency-domain analysis for design of the current control system of PMSM based on model predictive control Reviewed International journal

Yokoyama S., Shimaoka M., Doki S.

2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe Vol. 2017-January page： P1 - P10 2017.11

This paper describes a method of deriving frequency characteristics of PMSM current control system based on Model Predictive Control (MPC). MPC controller predicts the current behavior using the mathematical model of PMSM and directly selects the optimal switch state based on evaluation of these predicted results. So, we have focused the possibility of MPC, which makes it possible to drive machines seamlessly between linear operating region of inverter and the overmodulation operating region. But, MPC is a nonlinear control system, so its frequency characteristics are unknown. In this paper, we derive MPC's frequency characteristic approximately through simulation to realize its frequency domain design.

DOI： 10.23919/EPE17ECCEEurope.2017.8099119

Scopus

High Response Voltage Phase Torque Control of IPMSM for Both Linear and Over-modulation Range of Inverter Reviewed International journal

Matsuki Y., Doki S.

2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe Vol. 2017-January 2017.11

Language：English Publishing type：Research paper (international conference proceedings) Publisher：2017 19th European Conference on Power Electronics and Applications, EPE 2017 ECCE Europe

This paper proposes a high response voltage phase torque control method of interior permanent magnet synchronous motors for both linear and over-modulation range including six-step mode. In our proposed method, a new n-t coordinate system is utilized, on which voltage phase and amplitude are controlled responsively and stably.

DOI： 10.23919/EPE17ECCEEurope.2017.8098942

Scopus

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Papers - DOKI, Shinji