Interior permanent magnet machine with pole-to-pole asymmetry of rotor slot placement

摘要

An interior permanent magnet machine includes a rotor having a plurality of slots. First and second slots are disposed in a first pole and the third and fourth slots are disposed in a second pole. A first barrier is defined by the first, second, third and fourth slots. The slots are configured to be symmetric relative to their respective pole axes. A first angle is defined between the first and second slots. A second angle is defined between the third and fourth slots. The first angle is configured to be sufficiently different from the second angle so that torque ripple is minimized. Thus the rotor is configured such that the angular configuration of slots in a first pole is different from the angular configuration of slots in a second pole of the rotor.

主权项

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 defined by 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; a first barrier defined by the first, second, third and fourth slots; wherein the first and second slots are symmetric relative to the first pole axis and the third and fourth slots are symmetric relative to the second pole axis; 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 minimize torque ripple.