Patent ID: 8348598
Filing Date: 2013-01-08
Classification: F03D,F05B,F16C,Y02E

Abstract:
1. A rolling bearing for a wind turbine generator for supporting a first member and a second member which rotates relative to the first member, the rolling bearing comprising: an inner ring to which the first member is fixed; an outer ring to which the second member is fixed; a center ring held between the inner ring and the outer ring without being fixed to the first member and the second member and, wherein said center ring is rotatable independently of the inner ring and the outer ring; rolling elements which are provided between the inner ring and the center ring and between the center ring and the outer ring in such a manner that the rolling elements are allowed to freely roll; a center ring drive unit for rotating the center ring; and, a control unit for controlling the center ring drive unit to intermittently rotate the center ring.