Patent ID: 8319387

Claim:
A rotor, comprising: a rotor core having a rotation axis; and first permanent magnets and second permanent magnets arranged in the rotor core so that, on a cross-sectional plane of the rotor core perpendicular to the rotation axis, each of the first permanent magnets and each of the second permanent magnets corresponding to each other define the letter V having a first side, a second side and an apex pointing toward the rotation axis, the first side of the letter V being defined by each of the first permanent magnets, the second side of the letter V being defined by each of the second permanent magnets, each of the first permanent magnets and each of the second permanent magnets corresponding to each other cooperating to form a single magnetic pole, wherein each of the first permanent magnets and each of the second permanent magnets corresponding to each other are arranged on the cross-sectional plane of the rotor core so that a straight line interconnecting the rotation axis and the apex of the letter V is interposed therebetween, an angle of each of the first permanent magnets relative to the straight line being smaller than an angle of each of the second permanent magnets relative to the straight line, a width of each of the first permanent magnets in the direction parallel to the extension direction of the first side of the letter V being smaller than a width of each of the second permanent magnets in the direction parallel to the extension direction of the second side of the letter V.