| 摘要 |
PROBLEM TO BE SOLVED: To reduce cogging torque and torque puls of a rotor which has a buried permanent magnet. SOLUTION: An electric rotating machine comprises a stator 5, in which an armature winding is wound around a stator core, and the rotor 1 in which the permanent magnet 2 is buried in a rotor core 9. A hole 3 for prevention of a short circuit in magnetic flux, which is extended in a radial direction from a circumferential end (a vicinity of a q-axis) of the permanent magnet 2 to a vicinity of an outer periphery of the rotor core 9, is further extended to the side of a d-axis (in a circumferential direction), and formed in such a manner that the distance between the side of an outer periphery of the hole 3 and the outer periphery of the rotor core 9 is gradually made longer to the side of the d-axis from the side of the q-axis.
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