Appeal No. 2005-0375
Application No. 09/826,422
a stator configured in the form of an annular ring having a plurality of
groups of electromagnet poles, the groups substantially equidistantly
distributed along the angular extent of the annular ring, each of the groups
comprising magnetic material magnetically isolated and separated from the
other groups, the electromagnet poles having pole faces separated from
each other by gaps, gaps between pole faces within each group being of a
substantially uniform first angular distance; and
an annular rotor, concentric with an axis of rotation and concentric
with the annular stator to form a radial air gap therebetween comprising a
plurality of permanent magnets substantially equidistantly distributed with
alternating magnetic polarity along the angular extent of the air gap and
separated from each other by gaps of a second angular distance different
from the first angular distance, the permanent magnets having a common
magnetic return path;
wherein each group of electromagnet poles comprises windings that
are switchably energized from driving electromotive interaction between
the stator and rotor.
Heidelberg et al. (Heidelberg) 4,754,207 June 28, 1988
Hancock et al. (Hancock) 5,015,903 May 14, 1991
Forbes et al. (Forbes) 5,918,360 July 6, 1999
Acquaviva 6,181,035 Jan. 30, 2001
(Filing date Sept. 29, 1994)
Li 6,278,216 Aug. 21, 2001
(Filing date June 7, 1999)
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