Patent ID: 8487494

Claim:
An interior permanent magnet machine comprising: a rotor having a center and a plurality of slots; a single barrier defined by the plurality of slots in the rotor, such that the rotor includes no more than one of the single barrier; a plurality of first magnets and a plurality of second magnets disposed within the single barrier; wherein each of the first magnets is located at a different radial distance from the center relative to each of the second magnets; a first and a second pole defined by respective pole axes in the rotor; wherein the first magnets are located in the first pole and the second magnets are located in the second pole, thereby exhibiting pole-to-pole radial asymmetry; wherein the plurality of slots include first, second, third and fourth slots; wherein the first and second slots are provided in the first pole and located at first and second distances from the center, respectively; wherein the third and fourth slots are provided in the second pole and located at third and fourth distances from the center, respectively; and wherein the first, second, third and fourth distances are each different with respect to one another.