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Dovetail spoke internal permanent magnet machine

United States Patent

August 23, 2011
View the Complete Patent at the US Patent & Trademark Office
An internal permanent magnet (IPM) machine is provided. The IPM machine includes a stator assembly and a stator core. The stator core also includes multiple stator teeth. The stator assembly 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 defining a cavity. The IPM machine also includes a rotor assembly and a rotor core. The rotor core is disposed inside the cavity and configured to rotate about the longitudinal axis. The rotor assembly further includes a shaft. The shaft further includes multiple protrusions alternately arranged relative to multiple bottom structures provided on the shaft. The rotor assembly also includes multiple stacks of laminations disposed on the protrusions and dovetailed circumferentially around the shaft. The rotor assembly further includes multiple pair of permanent magnets for generating a magnetic field, which magnetic field interacts with the stator magnetic field to produce a torque. The multiple pair of permanent magnets are disposed between the stacks. The rotor assembly also includes multiple middle wedges mounted between each pair of the multiple permanent magnets.
Alexander; James Pellegrino (Ballston Lake, NY), EL-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Lokhandwalla; Murtuza (Clifton Park, NY), Shah; Manoj Ramprasad (Latham, NY), VanDam; Jeremy Daniel (West Coxsackie, NY)
General Electric Company (Niskayuna, NY)
12/ 432,894
April 30, 2009
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH & DEVELOPMENT This invention was made with Government support under contract number DE-FC26-07NT43122 awarded by U.S. Department of Energy. The Government has certain rights in the invention.