US 9,812,909 B2
Sectionalized electromechanical machines having low torque ripple and low cogging torque characteristics
Jeffrey K. Petter, Williston, VT (US); and Hector Hurtado, Montpelier, VT (US)
Assigned to WEG Electric Corp, Duluth, GA (US)
Filed by WEG Electric Corp., Duluth, GA (US)
Filed on Dec. 10, 2014, as Appl. No. 14/566,193.
Application 14/566,193 is a division of application No. 13/240,731, filed on Sep. 22, 2011, granted, now 8,912,704.
Claims priority of provisional application 61/385,660, filed on Sep. 23, 2010.
Prior Publication US 2015/0137652 A1, May 21, 2015
Int. Cl. H02K 1/16 (2006.01); H02K 21/16 (2006.01); H02K 29/03 (2006.01); H02K 15/02 (2006.01); H02K 1/14 (2006.01); H02K 1/27 (2006.01)
CPC H02K 1/165 (2013.01) [H02K 15/026 (2013.01); H02K 21/16 (2013.01); H02K 29/03 (2013.01); H02K 1/148 (2013.01); H02K 1/278 (2013.01); H02K 2213/03 (2013.01); H02K 2213/12 (2013.01); Y02E 10/725 (2013.01); Y10T 29/49009 (2015.01); Y10T 29/49012 (2015.01)] 25 Claims
OG exemplary drawing
 
1. An electromechanical machine having rotor poles and stator poles that cooperate to generate electricity from rotation or convert electricity to rotation, comprising inner and outer structures, at least one of said structures rotating relative to the other of said structures with the rotor poles disposed on the rotating structure and the stator poles disposed on the other structure, at least one of said structures including a plurality of sections, wherein:
the poles of said structure including the plurality of sections are arranged in sets of wound poles formed on teeth having a depth;
a set of said poles is disposed in each one of said plurality of sections and each set has two end poles, one at each section end;
the end poles are spaced from the section ends by an end space at each section end, the end space having a width of approximately the distance from the end pole winding to the section end, and a depth of approximately the depth of the wound pole teeth to define an end space area; and
an unwound tooth is disposed in each said end space, the unwound teeth occupying not more than 90% of said end space area.