High speed spindle motor and apparatus equipped with high speed spindle motor
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Sep 8, 1998
Grant Date -
N/A
app pub date -
Dec 19, 1995
filing date -
Dec 21, 1994
priority date (Note) -
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status (Latency Note)
Importance
Abstract
A spindle motor comprises a permanent magnet having an outer diameter, an outer circumference, and a number of poles. A stator core is disposed around and spaced from the outer circumference of the permanent magnet rotor. The stator core has a yoke portion, a number of lengthwise extending and circumferentially spaced slots, and a tooth portion between each adjacent two of the slots. The slots are disposed in close proximity to the outer circumference of the permanent magnet rotor, and a width of each of the slots in a radial direction of the stator core is smaller than a width of the yoke portion and equal to or greater than 1/20 of the outer diameter of the permanent magnet rotor. A coil has two or less turns and is comprised of a conductor disposed in the slots of the stator core.
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