| 摘要 |
PROBLEM TO BE SOLVED: To provide a rolling device having superior conductivity in which galvanization hardly occurs, and an inverter controlled motor having superior durability. SOLUTION: A deep groove ball bearing is equipped with: an inner ring 1 having a raceway surface 1a on an outer peripheral surface thereof; an outer ring 2 having a raceway surface 2a opposing the raceway surface 1a on its inner peripheral surface; a plurality of rolling elements 3 rollably disposed between the raceway surfaces 1a, 2a; a cage 4 for holding the plurality of rolling elements 3 between the inner and outer rings 1, 2; and seal devices 5, 5 that are like seals covering an opening of a gap between the inner and outer rings 1, 2. Further, a grease composition G for lubricating between the raceway surfaces 1a, 2a, and the rolling elements 3 is disposed in an inner space formed between the inner and outer rings 1, 2, and having the rolling elements 3 thereinside. The relative dielectric constant of the grease composition G is 3 or more. The ratio of the relative dielectric constant and an oil film parameter (relative dielectric constant/oil film parameter) of the grease composition G is 0.8 or more. COPYRIGHT: (C)2008,JPO&INPIT |
