- 名前：
- 方 志法
- 学年/肩書：
- 博士課程後期課程3年
- 役職：
- したっぱ
- グループ：
- モータ
- 趣味：
- 研究、旅行、聖地巡礼
研究テーマ / Research topic
誘導機高速駆動に関する研究（Study of The Induction Motor High-Speed Drive）
| English ver. | Japanese ver. |
// Induction Motor(IMs) has been widely used in many areas, such as electrical vehicles (EVs), more electrical aircrafts(MEAs), since their cost-efficiency and high reliability. Additionally, IMs are considered more sustainable than Permanent Magnet Synchronous Motors(PMSMs) for many countries all over the world, as the rare earth source is too expensive. Moreover, it is required to run at high-speed to achieve high power and high efficiency in many industrial applications.
However, the requirement of high-speed drive conflicts to the switching frequency limitation resulting from the semi-conductor performance. For example, the switching frequency is restricted to around 20kHz for IGBT and around 40kHz for SiC. Thus, an indicator called fundamental-to-switching frequency ratio (fe/fs) is proposed to define the ‘high-speed’ board line, where the fundamental frequency (fe) is the electrical frequency proportional to the rotating speed. The current control performance will significantly deteriorate as fe/fs increase. In my experiments, the current controller starts oscillating when fe/fs at around 0.04. Hence, my study focuses on the high-performance control when the fe/fs is high, such as fe/fs = 0.1. Actually, a part of my study has been published in an international conference[1~5]. In my experiments, the fe/fs can be improved up to 0.15 by designing the ACR based on the PEFD model.
The figure illustrated above is my experiment (my partner), which is named Motor T.
PUBLICATIONS
[1]Z. Fang and S. Doki, “An Innovative Discrete-Time dq-Axis Model Considering Phase Discretization Error for High-Speed IM Drive and Its Analysis,” 2024 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC), Naples, Italy, 2024, pp. 1-6, doi: 10.1109/ESARS-ITEC60450.2024.10819793.
[2]2025年電気学会全国大会(明治大学中野キャンパス)
[3]Z. Fang and S. Doki, “Optimal Approximation Order Analysis of the Phase-Error-Free Discrete-Time Model for Induction Motor High Speed Drive,” 2025 IEEE International Conference on Electrical Energy Conversion Systems and Control（IEECSC), Chongqing, China, 2025, pp. 13-17, doi: 10.1109/IEECSC64206.2025.11099925.
[4]Z. Fang and S. Doki, “Implementation Analysis and Evaluation of Phase-Error-Free Discrete-Time Model for Induction Motor High-Speed Drive under Various Operating Conditions,” IECON 2025 – 51st Annual Conference of the IEEE Industrial Electronics Society, Madrid, Spain, 2025, pp. 1-6, doi: 10.1109/IECON58223.2025.11221829.
[5]Z. Fang and S. Doki, “Analysis and Optimal Design of Phase-Error-Free Discrete-Time Model for Induction Motor Low Switching Frequency Drive,” 2025 IEEE Energy Conversion Conference Congress and Exposition (ECCE), Philadelphia, PA, USA, 2025, pp. 1-6, doi: 10.1109/ECCE58356.2025.11259507.
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//
誘導電動機（IM）は、そのコスト効率と高い信頼性から、電気自動車（EV）や電動航空機（MEA）など多くの分野で広く使用されています。さらに、IMは多くの国々において、希土類資源が高価であるため、永久磁石同期電動機（PMSM）よりも持続可能であると考えられています。さらに、多くの産業用途では、高出力と高効率を達成するために高速で運転することが求められます。
しかし、高速駆動の要求は、半導体の性能によるスイッチング周波数の制限と矛盾します。例えば、IGBTのスイッチング周波数は約20kHz、SiCでは約40kHzに制限されています。したがって、基本周波数（fe）対スイッチング周波数（fs）の比率（fe/fs）という指標が提案され、「高速」の基準を定義しています。基本周波数は回転速度に比例する電気的周波数です。fe/fsが増加すると、電流制御性能が著しく低下します。私の実験では、fe/fsが約0.04になると電流制御器が振動し始めます。したがって、私の研究は、fe/fsが高い場合、例えばfe/fs = 0.1のような高性能制御に焦点を当てています。実際、私の研究の一部は国際会議また国内会議で発表されています[1~5]。実機実験において、fe/fs = 0.15まででも安定的な運転することができるようになった。
これは私の仲間だ！モータTと呼ばれています！
[1]Z. Fang and S. Doki, “An Innovative Discrete-Time dq-Axis Model Considering Phase Discretization Error for High-Speed IM Drive and Its Analysis,” 2024 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC), Naples, Italy, 2024, pp. 1-6, doi: 10.1109/ESARS-ITEC60450.2024.10819793.
[2]2025年電気学会全国大会(明治大学中野キャンパス)
[3]Z. Fang and S. Doki, “Optimal Approximation Order Analysis of the Phase-Error-Free Discrete-Time Model for Induction Motor High Speed Drive,” 2025 IEEE International Conference on Electrical Energy Conversion Systems and Control（IEECSC), Chongqing, China, 2025, pp. 13-17, doi: 10.1109/IEECSC64206.2025.11099925.
[4]Z. Fang and S. Doki, “Implementation Analysis and Evaluation of Phase-Error-Free Discrete-Time Model for Induction Motor High-Speed Drive under Various Operating Conditions,” IECON 2025 – 51st Annual Conference of the IEEE Industrial Electronics Society, Madrid, Spain, 2025, pp. 1-6, doi: 10.1109/IECON58223.2025.11221829.
[5]Z. Fang and S. Doki, “Analysis and Optimal Design of Phase-Error-Free Discrete-Time Model for Induction Motor Low Switching Frequency Drive,” 2025 IEEE Energy Conversion Conference Congress and Exposition (ECCE), Philadelphia, PA, USA, 2025, pp. 1-6, doi: 10.1109/ECCE58356.2025.11259507.