Patent ID: 8729762

Claim:
A permanent magnet synchronous motor, comprising: a rotor including: a rotor iron core, and at least two permanent magnets, arranged circumferentially on the rotor iron core to form respective field poles, and different from each other in magnetic pole direction; wherein the rotor iron core has a plurality of slits including therein non-magnetic substance and extending between the permanent magnets circumferentially juxtaposed to each other; wherein Tp<Tc is satisfied when each of the slits has one of straight shape and arcuate shape, Tp is a radial thickness of each of the permanent magnets, and Tc is a radial thickness of the rotor iron core; and wherein 0.045<Wsl/Wpm<0.425 is satisfied when Wpm is an amount of total circumferential width of a surface of the permanent magnet facing to the rotor iron core to form one of the field magnetic poles, and Wsl is a total amount of widths of the slits extending partially between the surface and a center of the rotor to correspond to the one of the field magnetic poles, each of the widths being a dimension of respective one of the slits in a direction perpendicular to a longitudinal direction of the respective one of the slits.