Patent ID: 6762529
Filing Date: 2004-07-13
Classification: H02K

Abstract:
In a spindle motor comprising a shaft and a hub rotating over the shaft supported by a bearing for rotation relative to the shaft, the hub supporting a magnet radially aligned with a stator supported from an outer surface of the shaft, the stator comprising a plurality of laminations forming a laminated stack comprising a coating over the surface of the stack, the laminations having a circular inner yoke having an inner diameter sized to form an interference fit with a surface within the motor, the yoke further comprising a plurality of lamination features extending radially inward from the inner diameter of the yoke to have the coating scraped from the surface of the features by interference fit with an outer surface over which the stack is located, thereby rigidly establishing an axial, radial and circumferential location of the stator relative to the shaft while grounding the stator to the shaft or base of the motor.