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Torque ripple reduction in electric machines

United States Patent

August 22, 2017
View the Complete Patent at the US Patent & Trademark Office
An electric machine, such as an Internal Permanent magnet or Synchronous Reluctance machine, having X phases, that includes a stator assembly, having M slots, with a stator core and stator teeth, that is further configured with stator windings to generate a stator magnetic field when excited with alternating currents and extends along a longitudinal axis with an inner surface that defines a cavity; and a rotor assembly, having N poles, disposed within the cavity which is configured to rotate about the longitudinal axis, wherein the rotor assembly includes a shaft, a rotor core located circumferentially around the shaft. The machine is configured such that a value k=M/(X*N) wherein k is a non-integer greater than about 1.3. The electric machine may alternatively, or additionally, include a non-uniformed gap between the exterior surface of the rotor spokes and the interior stator surface of the stator.
Reddy; Patel Bhageerath (Niskayuna, NY), Huh; Kum-Kang (Niskayuna, NY), El-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Galioto; Steven Joseph (Waterford, NY)
14/ 057,591
October 18, 2013
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number DE-EE0005573 awarded by U.S. Department of Energy. The Government has certain rights in the invention.