Patent ID: 7521833

Claim:
A rotating electric machine comprising: an annular stator including an inner circumference, a plurality of teeth arranged along the inner circumference of the stator, and a slot defined between adjacent ones of the teeth; a coil arranged in the slot; a rotor surrounded by the stator, with the rotor having a rotational axis and an outer circumference extending about the rotational axis in a circumferential direction; and a plurality of permanent magnets embedded in the rotor, with each permanent magnet having a magnetic pole center; a plurality of circumferential portions respectively corresponding to the magnetic pole centers and defined along the outer circumference of the rotor at a plurality of locations, with each circumferential portion extending along part of a virtual circumferential surface, which is coaxial with the rotor, and spaced from one another in the circumferential direction; and a plurality of convex portions connecting adjacent pairs of the circumferential portions, wherein each of the convex portions is located radially inward from the virtual circumferential surface, projects in a radially outward direction, and includes a plurality of angled portions directed in the radially outward direction.