Patent ID: 8648513

Claim:
A permanent magnet type rotating electric machine, comprising: a rotor comprising a rotor core having a polygonally shaped periphery, a rotating shaft, a plurality of equiangularly arranged reference positions each of which is located in a center of a side of the polygonally shaped periphery at a same radial distance from a center of the rotating shaft, and a plurality of permanent magnets which form magnetic poles, which are arranged on the periphery of the rotor core, and which are shifted in circumferential directions according to a shift pattern which defines shifts of each of the plurality of permanent magnets which specifically target an N-th (N is an integer) order component of a cogging torque and predominantly reduce said N-th order component of the cogging torque; and a stator comprising a stator core, slots, and armature windings located in the slots, wherein, when a number of the magnetic poles is M (M is an integer) and a number of the slots is N, M permanent magnets are sequentially numbered from first to M-th in a circumferential direction and are shifted according to the shift pattern, and a positional shift amount from a corresponding one of the equiangularly arranged reference positions for an i-th (i=1, 2, . . . , M) permanent magnet is h i (i=1, 2, . . . , M) (including a sign), M unit vectors in total, each being in an angular direction of 2πN(i−1)/M (rad), are defined, and a sum of M vectors obtained by multiplying the unit vectors respectively by the positional shift amount h i is smaller than a maximum value of an absolute value of the positional shift amount h i .