Abstract: A motor includes a shaft supporting a rotation of a rotor, a sleeve supporting the shaft such that an upper end of the shaft protrudes upward in an axial direction, a rotor case having a rotor hub, which is forcibly inserted and fixed to a protrusion of the shaft, and rotated by a rotation of the shaft, and an adhesive sealing space formed on an insertion surface between the protrusion and the rotor hub.

Abstract: There is provided a hydrodynamic bearing assembly that includes: a sleeve with an axial hole into which a shaft is inserted; a radial dynamic pressure unit formed on at least one of an outer diameter of the shaft and an inner diameter of the sleeve; and a sub-radial dynamic pressure unit formed on at least one of the outer diameter of the shaft and the inner diameter of the sleeve in an upper part in an axial direction of the radial dynamic pressure unit, wherein an oil interface formed in an axial hole between the radial dynamic pressure unit and the sub-radial dynamic pressure unit moves up toward the sub-radial dynamic pressure unit as the temperature of a motor rises due to driving of the motor.

Abstract: A motor includes a shaft supporting a rotation of a rotor, a sleeve supporting the shaft such that an upper end of the shaft protrudes upward in an axial direction, a rotor case having a rotor hub, which is forcibly inserted and fixed to a protrusion of the shaft, and rotated by a rotation of the shaft, and an adhesive sealing space formed on an insertion surface between the protrusion and the rotor hub.

Abstract: Disclosed herein is a spindle motor which is capable of more easily controlling an axial gap and levelness between the thrust plate of a rotating shaft and a sealing cap. The spindle motor includes a rotating shaft having a thrust plate which is perpendicularly inserted into the upper portion of the rotating shaft. A sleeve accommodates the rotating shaft and rotatably supports the rotating shaft. The sleeve is secured to a plate. A sealing cap is secured to the sleeve through laser welding in such a way as to face the upper surface of the thrust plate. At least part of the sealing cap is stepped towards the thrust plate to correspond to a degree of deformation occurring during the laser welding.

Abstract: Disclosed herein is a spindle motor which is capable of more easily controlling an axial gap and levelness between the thrust plate of a rotating shaft and a sealing cap. The spindle motor includes a rotating shaft having a thrust plate which is perpendicularly inserted into the upper portion of the rotating shaft. A sleeve accommodates the rotating shaft and rotatably supports the rotating shaft. The sleeve is secured to a plate. A sealing cap is secured to the sleeve through laser welding in such a way as to face the upper surface of the thrust plate. At least part of the sealing cap is stepped towards the thrust plate to correspond to a degree of deformation occurring during the laser welding.