This study evaluates the outer race defect size of ball bearings in the accelerated life test by analyzing the signal of electromagnetic sensor. The electromagnetic sensor consists of a permanent magnet and a pickup coil. When a conductor passes in the static magnetic field, the generated eddy current is detected as the change of the magnetic field. The autocorrelatio n method is applied for sizing defects in the early phase of the damage progress and the RMS method is developed for bigger defects. With th...
英字タイトル:
Electromagnetic Nondestructive Detection for Monitoring the Damage Progress of Ball Bearings