Construction of high-speed magnetic property evaluation system under inverter excitation for high-speed high-power density motor core

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K04509
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 21030:Measurement engineering-related
• Research Institution: Nippon Bunri University
• Principal Investigator: Oka Mohachiro 日本文理大学, 工学部, 特任教授 (80107838)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: PWMインバータ / 鉄損 / 電磁鋼板 / ステータコア / 高調波 / IGBT / SiC

Outline of Final Research Achievements

In this research, a PWM inverter using an IGBT specialized for magnetic measurement was produced and its effectiveness was demonstrated. We also prototyped a PWM inverter using SiC and GaN. In addition, we constructed a magnetic characteristic measurement device under PWM inverter excitation that has functions such as automatic parameter setting of the PWM inverter. The superiority of the laminated ring core and wound laminated ring core which were made from the ultra-thin electrical steel sheet was also demonstrated. In addition, we measured the circumferential magnetic property distribution of the stator cores of the outer rotor permanent magnet motor and the double axial gap induction motor, demonstrating the importance of correctly evaluating the magnetic properties of stator cores with complex shapes.

Free Research Field

計測工学

Academic Significance and Societal Importance of the Research Achievements

この研究の学術的な意義は，PWMインバータの各種パラメータを自動設定できるディレイパターンジェネレータを備え，IGBT製PWMインバータ，数値制御直流電源，広帯域電流プローブを統合したPWMインバータ励磁下の磁気特性測定装置を構築したことである。また，この装置のPWMインバータのSiC化やGaN化にめどをつけたことである。さらに，各種形状のステータコアの磁気特性分布の測定を可能にする励磁法を提案したことである。これによって，従来明らかにされていなかった極薄電磁鋼板製巻き積層コアのPWMインバータ励磁下の磁気特性が明らかになり，これを使ったモータの高効率化に貢献できることである。