PERMANENT MAGNET-TYPE ROTARY ELECTRIC MACHINE AND VEHICLE DRIVE SYSTEM

摘要

A rotor core 6 includes magnet insertion holes 9 embedding permanent magnets 9a and arranged in a substantially U-shape, facing an outer circumferential surface of a rotor 5, and includes hollow portions 9b formed at both side surface portions in a direction orthogonal to a magnetization direction of the permanent magnets 9a embedded in the magnet insertion holes 9. A permanent magnet group for each pole having the plurality of permanent magnets includes vent holes 7 passing through the rotor core 6 in a direction of a rotating shaft 51, between one of the magnet insertion holes 9 in which the permanent magnets are embedded and adjacent one of the magnet insertion holes 9 or between the one of the magnet insertion holes 9 and outer circumferential portions of the rotor core 6. The vent holes 7 are arranged at positions to form the substantially U-shape together with the magnet insertion holes 9.