ROTOR HAVING EMBEDDED PERMANENT MAGNET

摘要

PURPOSE: A rotor is provided to reduce the amount of the use of a magnet by thinly forming the thickness between the magnetic poles of a center magnet than a side magnet. CONSTITUTION: A short-circuit preventing groove(10e) for preventing the short-circuit of a magnetic flux between the adjacent permanent magnets is formed in the circumference of a core. A magnet insertion hole(10f) of a square shape is formed in a parallel direction to the tangent line of the core circumference. The pole face(1a) of the core outer peripheral side of a side magnet(2) and the center magnet(1) are magnetized to a N pole. The pole face(1b) of the core inner circumference(10d) is magnetized to a S pole. The thickness(M1) between the magnetic poles of the center magnet is thinner than the thickness(M2) of the side magnet of both ends. A magnetoresistive torque is increased with the volume increment of the core in the front part of a magnetic pole(10a).