Geometrically aligning a stator and a base plate for a spindle motor
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United States of America Patent
Stats
-
Jul 26, 2005
Grant Date -
Mar 17, 2005
app pub date -
May 25, 2004
filing date -
Sep 16, 2003
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
Stator and base plate interface alignment is provided for a spindle motor, meeting design specifications such that motor performance is maintained. A portion of a surface of the stator is separated from the base plate. Accurate stator z-height, parallelism and concentricity are provided for use with a low profile disc drive memory system. In an aspect, laminations are formed about a stator and the bottom layer laminations are formed with a smaller diameter than the top layer lamination. The stator bottom layer laminations seat on a flat base plate machined surface, avoiding a base plate corner radius. Precise machining of a small corner interface of the base plate where a stator is typically seated and aligned with the base plate is made unnecessary. Component machining costs, wear and tear to machining systems, and machining process cycle times are reduced.
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