Disc drive spindle motor with low cogging torque
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United States of America Patent
Stats
-
Aug 15, 1989
Issued Date -
N/A
app pub date -
Oct 30, 1987
filing date -
May 4, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A disc drive spindle motor having a stator with nine evenly distributed windings separated by relatively large slot openings, further comprises a rotor having a radially polarized eight-pole magnet. The motor of this invention has three phases, the first phase starting at any winding end of the nine windings and incorporates the windings n, n+2 and n+4 connected in series and being wound in the same direction; the second phase starting at the winding n+3, and incorporating the windings n+5 and n+7 connected in series and being wound in the same direction; and the third phase beginning with the winding n+6 and incorporating the windings n+8 and n+1, connected in series and wound in the same direction. The starting points of the three phases are selected to provide the necessary 120.degree. phase shift between windings.
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