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概要

The epochal electromagnetic nondestructive detection method was proposed. In this method a permanent magnet is utilized to generate a static magnetic field and a coil with several hundred turns is used to detect the eddy currents induce d inside the ball bearings. In the present study the method is applied to observed and evaluate ball bearings contaminated extraneous substances. Experimental validations are carried out using a common ball bearing. A wound and the malf unction of bearings are well detected by the method in spite of the presence of a metallic case and a large lift-off. Comparing the signals from a normal bearing with ones from bearings with contaminated by 0.01mm to 0.1 mm radius of fi ne silicon carbide, it can be seen that the signal voltage becomes higher in accordance with enhanced the radius. From these results the relationship between the signal voltage and extraneous substance radius is expected to be obtained.

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