Patent ID: 6898052
Filing Date: 2005-05-24
Classification: F16C,G11B,H02K

Abstract:
1. A spindle motor for use in a disk drive, the spindle motor comprising: a spindle motor base; a motor shaft in mechanical communication with the spindle motor base, the motor shaft having a central axis and a distal end; a spindle motor hub rotatably coupled to the spindle motor base, the spindle motor hub including a central magnetic metal portion disposed adjacent the distal end; a ball bearing set disposed between and in mechanical communication with the spindle motor hub and the motor shaft for rotatably coupling the spindle motor hub and the spindle motor base; and a shaft magnetic element attached to the motor shaft at the distal end adjacent the central magnetic metal portion; wherein the shaft magnetic element being sized and configured to apply an attractive magnetic force to the central magnetic metal portion in a direction along the central axis for pre-loading the ball bearing set.