Patent ID: 7622841

Claim:
A motor comprising: a stator configured by winding a coil around a stator core, the stator core including a salient-pole core and a yoke; and a rotor including a rotor core made by laminating thin and highly permeable iron sheets, the rotor being rotatably held facing an inner peripheral face of the salient-pole core via a gap; wherein the rotor core has a plurality of permanent magnet embedding holes, a permanent magnet being embedded in and held stationary by each of the permanent magnet embedding holes absent adhesive; a cross section of the permanent magnet is a rectangle with a long side in a rotating direction and a short side perpendicular to the long side; a cross section of each of the permanent magnet embedding holes has an embedding hole's long side corresponding to the long side and an embedding hole's short side corresponding to the short side; and the embedding hole's short side has a first protrusion and a flat portion, and a second protrusion is provided on both ends of the embedding hole's long side to an inner diameter side so that a protruded whole shape of the second protrusion is disposed to be on a center side of the embedding hole from the flat portion.