Abstract
In late years, many inverters (a variable voltage, a variable frequency control unit) are used with the air conditioner and the Uninterruptible Power Supply (UPS) etc. An electric corrosion occur to the bearing in the cooling fan used near the inverter happens frequently. This phenomenon is assumed a cause that a slight current is generated by the high frequency noise caused by the inverter, and the current flows to the bearing in long time. A lot of researches on electric pitting of bearings for the railroad vehicles have been done, but there is little research intended for the small ball bearings. In this research, the bearing characteristic when it is assumed to be a final purpose to investigate the cause in which the high frequency stray current corrosion happens, and rotates the bearing in the high frequency environment is examined. This is a basic experiment of electric pitting without turning on electricity for small ball bearings (693).
