Rotor for use in IPM rotating electric machine, and IPM rotating electric machine provided with the rotor

An IPM (interior permanent magnet) rotating electric machine, comprising:

• a stator core;
• stator windings provided in the stator core;
• a rotor core having a rotation axis and an outer circumference surrounded by the stator core;
• and
• first permanent magnets and second permanent magnets arranged in the rotor core such that each of the first permanent magnets corresponds to one of the second permanent magnets and, on a cross-sectional plane of the rotor core perpendicular to the rotation axis, a first line passing through said each of the first permanent magnets in an extension direction thereof and a second line passing through said one of the second permanent magnets in an extension direction thereof meet at a point pointing toward the rotation axis, said each of the first permanent magnets and said one of the second permanent magnets cooperating to form a single magnetic pole,
• wherein said each of the first permanent magnets and said one of the second permanent magnets are arranged on the cross-sectional plane of the rotor core such that a straight line interconnecting the rotation axis and the point is interposed therebetween, an angle of said each of the first permanent magnets relative to the straight line being smaller than an angle of said one of the second permanent magnets relative to the straight line, and a width of said each of the first permanent magnets in the direction parallel to the first line being smaller than a width of said one of the second permanent magnets in the direction parallel to the second line.