Study of iron loss estimation method for silicon steel sheet under inverter excitation considering anomalous loss for design without prototype

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04411
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21010:Power engineering-related
• Research Institution: Chiba University
• Principal Investigator: Miyagi Daisuke 千葉大学, 大学院工学研究院, 教授 (10346413)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 鉄損推定 / インバータ励磁 / ヒステリシス損 / 渦電流損 / 異常渦電流損 / プレイモデル / 有限要素法

Outline of Final Research Achievements

In order to establish a method for estimating iron loss of motors under PWM inverter excitation, we have improved the estimation accuracy of minor loops and studied estimation methods for eddy current loss and anomalous loss in no-oriented electrical steel sheets. Experiment results showed that there is a flux transient phenomenon in hysteresis loops under DC-biased magnetization in no-oriented electrical steel sheets, and that the Play model cannot model the minor loops with high accuracy because of this phenomenon. Furthermore, the anomalous loss under PWM inverter excitation was evaluated from the measured iron loss and the eddy current loss obtained by the Play model and 1-D finite element method for no-oriented electromagnetic steel sheets, and it was shown to be independent of the modulation level of PWM inverter, although it was verified only under certain conditions.

Free Research Field

電気機器学

Academic Significance and Societal Importance of the Research Achievements

車の電動化が推し進められる中で，回転機の低損失化は極めて重要な研究課題である。交流モータをインバータで励磁すると負荷率が小さいときほど渦電流損の割合が増加することが問題となっており，これを低減するためには異常渦電流損も含めた鉄損推定手法の確立が急務である。そのような中で，インバータ励磁下での新たな異常渦電流損特性を明らかにしたことは，鉄損推定手法の高精度化を前進させ，低損失なモータシステムの構築に貢献することから，カーボンニュートラルを目標としている我が国において，研究成果の社会的意義は大きい。