The realization of the high efficient wave power generation using high thrust density linear motor based on the regenerative power maximization

2023 Fiscal Year Final Research Report

• Project/Area Number: 20K14717
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Mie University
• Principal Investigator: Koyama Masato 三重大学, 工学研究科, 助教 (50804473)
• Project Period (FY): 2020-04-01 – 2024-03-31
• Keywords: スパイラルモータ / 波力発電 / 最大電力点追従制御 / 機械アドミタンス制御

Outline of Final Research Achievements

This study proposed applying the helical motor which has high thrust density to wave power generation as the generator. By the mathematical model, it derived the power generation characteristic and the control method maximizing the generation efficiency. Although this motor needs magnetic levitation control continuously, we achieved the high efficient power generation by applying the virtual admittance control with designing the apparent mechanical characteristic properly. By optimizing the derived power generation efficiency by designing the parameters of the admittance model, it achieved the efficiency maximization. Furthermore, it improved the motion control performance and re-designed the motor structure for increasing the thrust density. As a result, we achieved the high efficient generation around 90% with the expected ocean wave frequency from 0.1 to 1.0Hz on the numerical simulation emulating the experiment.

Free Research Field

電気電子工学

Academic Significance and Societal Importance of the Research Achievements

高推力密度を有するスパイラルモータを波力発電に適用、数理モデルから発電効率を最大化する制御系の設計法を明らかにした。本モータは常時磁気浮上のための電力を必要とするが、従来の発電制御では発電動作のみを考慮していたため、本研究は本モータ発電特性だけでなく力行動作も同時に考慮可能な手法を明らかにした。また効率最大化が可能な制御系設計法、構造再設計による推力密度向上により効率を更に改善できると明らかにした。日本近海での波力周波数0.1Hz～1.0Hzにおいて同程度の定格推力密度を有する一般的なモータでは60%前後だが、本研究成果では実機模擬シミュレーションにおいて90%の効率を保持できると示した。