In detail, the flux barrier provided at one end of the permanent magnet 230 includes a middle flux barrier 241 communicating with the magnet insertion hole 223, a left flux barrier 225 provided at the left side of the middle flux barrier 241, and a right flux barrier 226 provided at the right side of the middle flux barrier 241. Between the middle flux barrier 241 and the left flux barrier 225, a partition wall 220b formed of an iron core forming the rotor 220 is interposed. Further, between the middle flux barrier 241 and the right flux barrier 226, the partition wall 220b formed of the iron core forming the rotor 220 is interposed. Thus, the left flux barrier 225 and the right flux barrier 226 are spaced apart from the middle flux barrier 241 by a predetermined distance.

The flux barrier provided at the other end of the permanent magnet 230 also includes a middle flux barrier 242 communicating with the magnet insertion hole 223, a left flux barrier 227 provided at the left side of the middle flux barrier 242, and a right flux barrier 228 provided at the right side of the middle flux barrier 242. A partition wall 220b is interposed between the middle flux barrier 242 and the left flux barrier 227. The partition wall 220b is also interposed between the middle flux barrier 242 and the right flux barrier 228. Thus, the left flux barrier 227 and the right flux barrier 228 are spaced apart from the middle flux barrier 242 by a predetermined distance.