PERMANENT MAGNET-TYPE ROTARY ELECTRIC MACHINE AND VEHICLE DRIVE SYSTEM

摘要

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