Patent ID: 7667363

Claim:
A permanent magnet embedment rotating electric machine, comprising: an annular stator, the stator defining a radial direction; a plurality of teeth arranged on an inner circumference of the stator, a slot being defined between each adjacent pair of the teeth; a plurality of coils, each coil being arranged in the corresponding slots; a rotor located inside of the stator, the rotor being rotatable in a rotation direction, the rotor defining a rotational axis, a virtual circumference about the rotational axis, and said rotor comprising a rotor core having an outer circumference, wherein the rotor core outer circumference is alternately provided with a plurality of circumferential core portions and a plurality of convex core portions, the circumferential core portions being included in the virtual circumference, each of the circumferential core portions including a circumferential center, the convex core portions being located radially inward of the virtual circumference and bulging radially outward, each convex core portion including first and second angle core portions, and three peripheral core straight lines, wherein said three peripheral core straight lines are connected to one another to define the first and second angle core portions, said rotor further defining first virtual straight lines and second virtual straight lines, wherein each of said first virtual straight lines connecting the rotational axis to one of the circumferential centers of said circumferential core portions being referred to as radial lines, each of said second virtual straight lines bisecting one of the convex core portions being referred to as bisectors; a plurality of permanent magnets embedded inside the rotor, each of the permanent magnets having a magnetic pole center; and a plurality of magnetic flux blocking regions located on the rotor core, one of the magnetic flux blocking region being located in a range between the radial line and the bisector adjacent to and preceding the radial line in the rotation direction, wherein the second angle core portion is closer to the radial line than the first angle core portion, wherein a straight line, which connects the second angle core portion to the rotational axis, is referred to as an angle straight line, and wherein the magnetic flux blocking region is located in a range between the radial line and the angle straight line.