Innovative insulation design method of converter-fed rotating machine for construction of sustainable society

2016 Fiscal Year Final Research Report

• Project/Area Number: 25289072
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Partial Multi-year Fund
• Section: 一般
• Research Field: Power engineering/Power conversion/Electric machinery
• Research Institution: The University of Tokyo
• Principal Investigator: Kumada Akiko 東京大学, 工学(系)研究科(研究院), 准教授 (20313009)
• Co-Investigator(Kenkyū-buntansha): 松岡 成居 東京大学, 工学(系)研究科(研究院), 助教 (10114646) ; 日高 邦彦 東京大学, 工学(系)研究科(研究院), 教授 (90181099) ; 岩渕 大行 横浜国立大学, 工学(系)研究科(研究院), 助教 (50757341)
• Project Period (FY): 2013-04-01 – 2017-03-31
• Keywords: インバータサージ / 電界緩和 / 繰り返しインパルス / 回転機

Outline of Final Research Achievements

Surface potential measuring system (respondable frequency : commercial frequency ~ 100 MHz) using Pockels crystal was assembled and was applied to the measurement of transient change of the electric field distribution of the stress grading system (the part to which the nonlinear resistance was added) at the end of the bar-coil for the high-voltage rotating machine. The spatial resolution of this system is about 2 ㎜. Using this system, the electric field distribution at the relevant part under the application of PWM, repetitive impulse, commercial frequency voltage was measured. We also established an analysis by the finite element method and proposed an equivalent circuit model. With these prospects, it became possible designing the stress grading system with good outlook.

Free Research Field

電気工学