Electromagnetic evaluation of the impeller of a turbine using a hightemperature superconductivity electromagnet
黄 宇 Haoyu HUANG 高瀬 健太郎 Kentaro TAKASE 柴下 直昭 Naoaki SHIBASHITA 釘本 三男 Mitsuo KUGIMOTO 塚本 透 Toru TSUKAMOTO
Electromagnetic Evaluation Method High Temperature Superconductivity Electromagnet Turbine
Abstract: This study proposes an electromagnetic method for the evaluation of the condition of a turbine in a nuclear power plant. Experimental results of a small turbine driven by an electric motor are shown in th is paper. A high temperature superconductivity electromagnet is applied outside the case of the turbine to provide excitation magnetic field. On the other hand, pickup coils are placed near the impeller inside the case of the turbine. The experimental results show that it is not only possible to detect the movement but also the condition of the impeller by applying the electromagnetic evaluation method. Moreover, an enforcem ent vibration experiment shows that the vibration increment as well as the main frequency of the vibration o f the impeller can be detected when comparing the results of cases with and without enforcement excitation.