Patent ID: 6583952
Filing Date: 2003-06-24
Classification: F16C,G11B,H02K

Abstract:
A spindle motor for use in a magnetic data storage system including a rotating shaft having a central section and two independent fluid dynamic bearings on opposite sides of said central section,each of said bearings comprising a bearing cone fixed to the shaft and tapering radially inwardly towards said central section, and a bearing seat fixed around the shaft, each of the bearing seats having a fluid bearing surface facing a surface of said bearing cone across a first gap to thereby establish a first section of a fluid dynamic bearing, each of said fluid dynamic bearings further comprising an opening defined between an inner surface of said bearing cone and a surface of said shaft, and a second section of a gap defined between a radially extending surface of said bearing cone and a surface fixed to said bearing seat, so that a continuous gap is formed around each of said bearing cones, and a fluid in said continuous gap separating said facing surfaces of said bearing seat and said bearing cone to allow free rotation of said shaft and said bearing cone, and a centrifugal capillary seal on one side of each said bearing cone and a grooved pumping seal on an opposite side of each said bearing cone to isolate and contain said fluid within said independent fluid dynamic bearings.