Stator grounding means based on radial interference
AssigneeSeagate Technology LLC
InventorsAnthony Joseph Aiello, Alan Lyndon Grantz
Life of this patent
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Abstract
An improved spindle motor design of a type especially for use in a disc drive is disclosed, which provides a simplified design for installation of the stator over the shaft, and should especially locate the stack both radially and axially in a specific location relative to the shaft so that its location relative to the surrounding, rotating parts of the motor is fixed. In addition, the improved spindle motor design fixes the stack on the shaft through radial interference, eliminating the need for adhesive to fix the stator to the shaft. Also, the design minimizes the cost of assembling the stack on the shaft, isolates the stack and shaft from conveying vibration one to the other, and electrically grounds the stack to the shaft.
Claims10
In a spindle motor comprising a shaft and a hub rotating over said shaft supported by bearing means for rotation relative to said shaft, said hub supporting a magnet radially aligned with a stator supported from an outer surface of said shaft,
- a conductive clip ring surrounding a limited region of said shaft between said shaft and said stator and resting against either a fixed feature or recess on said shaft or an inner race of said bearing, said clip ring rigidly establishing an axial, radial and circumferential location of said stator relative to said shaft while grounding said stator to said shaft.
In a spindle motor comprising a shaft and a hub rotating over said shaft supported by bearing means for rotation relative to said shaft, said hub supporting a magnet radially aligned with a stator supported from an outer surface of said shaft,
- locating means supported from a feature on said shaft or said bearing for conductively and rigidly fixing the axial, radial and circumferential location of said stator relative to said shaft or said bearing while grounding said stator to said shaft.
Dependencies are inferred from the claim text.