Patent ID: 7705503
Filing Date: 2010-04-27
Classification: H02K

Abstract:
1. A rotating electrical machine comprising: a ring-shaped stator; and a rotor arranged inside the stator, wherein the stator includes a stator core with armature windings, wherein the rotor includes a rotor core in which permanent magnets are inserted and cooling holes are formed, and a coolant flowing in each of the cooling holes, wherein a pair of two cavities are provided to each of a plurality of predetermined locations set up along an outer periphery at intervals in a circumferential direction of the rotor core and each permanent magnet is inserted in each cavity, and each pair of two cavities are formed in a V-formation which opens to a rotation axis of the rotor core to make a magnetic pole there-between, and wherein each of the cooling holes is formed at a middle position of the magnetic pole made between each pair of two cavities so as to have a sectional view, an outside half of which is convex toward an outer periphery and an inside half of which is arcuate and curved inward to the rotation axis of the rotor core.