Electromagnetic Nondestructive Detection for Wounded Bearings and Correlation of Size of Defect and Signal
萱田 良 Ryo KAYATA 三好 剛正 Takemasa MIYOSHI 藤原 英起 Hideki FUJIWARA ペラン ステファン Perrin Stephane 角皆 学 Manabu TSUNOKAI 高瀬 健太郎 Kentaro TAKASE 宮 健三 Kenzo MIYA
Ball BearingsEddy CurrentsElectromagnetic Nondestructive Detection Method
A new electromagnetic method for the nondestructive evaluation of electric pumps with ball bearings is proposed. A permanent magnet generates a static magnetic field and a coil of several hundred turns wrapped around it is used to pick up eddy currents induced inside rotating ball bearings and impellers. First, a method that makes use of the autocorrelation is applied to the signals of the ball bearings. A relation between the processed signals and the size of the defects in the bearings is obtained.