Patent ID: 9712005
Date: 2017-07-18
CPC Classifications: H02K

Claim:
1. An interior permanent magnet machine comprising: a rotor having a center and a plurality of slots, the rotor being configured to magnetically interact with a stator; a first and a second pole having centrally-located first and second pole axes in the rotor, respectively; wherein the plurality of slots includes first, second, third and fourth slots, the first and second slots being disposed in the first pole and the third and fourth slots being disposed in the second pole; wherein the first, second, third and fourth slots are substantially arc-shaped; a first barrier defined by the first, second, third and fourth slots; a first angle defined between respective centerlines of the first and second slots, and a second angle defined between respective centerlines of the third and fourth slots; and wherein the first angle is sufficiently different from the second angle to reduce torque ripple.