Sectionalized Electromechanical Machines Having Low Torque Ripple and Low Cogging Torque Characteristics

摘要

A method and apparatus for reducing or eliminating the effects of torque ripple and cogging torque and otherwise improving performance in an electromechanical machine such as a motor or generator. The rotor and/or stator is conceptually sectionalized and the sections spaced apart by amount sufficient to alleviate deleterious aspects of cogging torque and torque ripple. Positioning of the stator teeth or rotor magnets is determined based on the calculated spacing. Conceptual sections may be formed as physically individual segments. Unwound teeth may be disposed in end spaces between sections occupying less than the entire area of the end space.

主权项

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.