Patent ID: 8928197
Filing Date: 2015-01-06
Classification: H02K

Abstract:
1. An interior permanent magnet machine comprising: a rotor having a plurality of arc segments that are substantially arc-shaped; wherein the rotor includes a first and a second pole; wherein the plurality of arc segments includes a first layer disposed in the first pole, the first layer defining a first configuration relative to a first arc center; wherein the plurality of arc segments includes a second layer disposed in the second pole, the second layer defining a second configuration relative to a second arc center; wherein the rotor is configured such that the first configuration is sufficiently different from the second configuration to minimize torque ripple; the first layer includes first, second and third arc segments in the first pole, the second arc segment being adjacent to the first and third arc segments; the first and third arc segments are located at a first distance from the first arc center, the first and third arc segments being symmetric relative to a first pole axis; the second arc segment is located at a second distance from the first arc center; and the first distance is different from the second distance.