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Spoke permanent magnet machine with reduced torque ripple and method of manufacturing thereof

United States Patent

March 15, 2016
View the Complete Patent at the US Patent & Trademark Office
An internal permanent magnet machine includes a rotor assembly having a shaft comprising a plurality of protrusions extending radially outward from a main shaft body and being formed circumferentially about the main shaft body and along an axial length of the main shaft body. A plurality of stacks of laminations are arranged circumferentially about the shaft to receive the plurality of protrusions therein, with each stack of laminations including a plurality of lamination groups arranged axially along a length of the shaft and with permanent magnets being disposed between the stacks of laminations. Each of the laminations includes a shaft protrusion cut formed therein to receive a respective shaft protrusion and, for each of the stacks of laminations, the shaft protrusion cuts formed in the laminations of a respective lamination group are angularly offset from the shaft protrusion cuts formed in the laminations in an adjacent lamination group.
Reddy; Patel Bhageerath (Niskayuna, NY), EL-Refaie; Ayman Mohamed Fawzi (Niskayuna, NY), Huh; Kum-Kang (Niskayuna, NY), Alexander; James Pellegrino (Ballston Lake, NY)
13/ 958,693
August 5, 2013
GOVERNMENT LICENSE RIGHTS This invention was made with Government support under contract number DE-EE0005573 awarded by the United States Department of Energy. The Government has certain rights in the invention.