Loss Analysis of Induction Motor Taking Account of Deterioration of Magnetic Characteristics by Stress Tensor

2018 Fiscal Year Final Research Report

• Project/Area Number: 16K06230
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: Saga University
• Principal Investigator: Muramatsu Kazuhiro 佐賀大学, 理工学部, 教授 (30263627)
• Co-Investigator(Kenkyū-buntansha): 高 炎輝 佐賀大学, 理工学部, 助教 (40586286)
• Project Period (FY): 2016-04-01 – 2019-03-31
• Keywords: 磁界解析 / 回転機 / 鉄損 / 応力 / マクスウェルの応力テンソル / 回転損

Outline of Final Research Achievements

In this research, a loss calculation method taking account of the deterioration of magnetic properties due to stress for rotating machines is developed. First, as a modeling method of magnetic properties, an energy-based modeling method of hysteresis using free energy is developed so that the effect of stress can be considered by elastic energy. Moreover, to obtain the stress distribution in the iron core, a new expression method of Maxwell's stress tensor to calculate the local force is proposed and verified. Finally, the calculation method of the rotational iron loss is proposed and its usefulness is shown.

Free Research Field

電気機器・電磁装置の数値解析

Academic Significance and Societal Importance of the Research Achievements

本研究課題で開発した応力による鉄損増加が考慮できる磁界解析法を用いれば，CO2削減で重要なモータのより詳細な高効率化設計が可能となり，社会的意義は大きい．また，電磁力の算出に用いるマクスウェルの応力テンソルに関して，従来の全体力のみでなく，局所力の算出に着目し，新しい表現方法を提案したことの学術的意義は大きい．