PERMANENT MAGNET TYPE ROTARY ELECTRICAL MACHINE

摘要

Disclosed is a permanent magnet type rotary electrical machine in which generation of leakage magnetic flux can be effectively suppressed, while centrifugal force intensity can be preserved. The electrical machine is equipped with a rotor (5) in which are embedded three permanent magnets (8a to 8c) for a single pole in the interior of a rotor core (6). The rotor (5) is rotatably arranged, with the provision of a rotation gap, on a stator comprising a stator coil accommodated in the interior of a slot. Magnet insertion holes, in which the permanent magnets (8a to 8c) are embedded, are provided in the rotor core (6) adjacent to one another in a substantially U-shaped formation directed towards the outer peripheral surface of the rotor (5). Cavities (9a1, 9a2, 9b1, 9b2, 9c1 and 9c2) are formed at the side faces of the permanent magnets (8a to 8c) which are embedded in the magnet insertion holes.