Patent ID: 6373655
Filing Date: 2002-04-16
Classification: G11B,H02K

Abstract:
A spindle motor comprising a rotatable shaft supporting a hub for supporting a rotating disc media for data storage in a computer system comprising:a single piece base of aluminum having an axial extending sleeve having inner and outer surfaces, the sleeve inner surface defining a first axial extending opening wherein the shaft is located the inner surface of the sleeve cooperating with an outer surface of the rotatable shaft to define a hydrodynamic bearing supporting the shaft for rotation; said rotating shaft affixed to a hub for supporting said disc media; the rotating shaft having a thrust plate at an end thereof opposite from the hub and rotating over a counterplate supported in a second opening in the base, the single piece base and sleeve including a surface facing a surface of the thrust plate, the first and second openings together defining an axial opening extending entirely through the single piece base having an axial extending sleeve, said motor also comprising a drive assembly including a stator supported from the base and a permanent magnet supported from the hub and aligned with the stator, energization of the stator causing rotation of the hub.