Patent ID: 7545074

Claim:
A rotor for a rotating electrical machine comprising: a rotary shaft; a pair of first and second pole cores fixed on the rotary shaft, each of the first and second pole cores including a plurality of claws each of which extends in an axial direction of the rotary shaft and has a distal end portion, the claws of the first pole core being interleaved with the claws of the second pole core; a plurality of permanent magnets each of which is interposed between adjacent two of the claws of the first and second pole cores in a circumferential direction of the rotary shaft; and a magnet holder holding the permanent magnets, the magnet holder being made of a non-magnetic metal and having a plurality of holding portions and a plurality of connecting portions, each of the holding portions being interposed between adjacent two of the claws of the first and second pole cores in the circumferential direction of the rotary shaft, so as to hold a corresponding one of the permanent magnets between the adjacent two of the claws, each of the connecting portions extending in the circumferential direction of the rotary shaft, through the radially inner side of the distal end portion of one of the claws of the first and second pole cores, to connect end portions of adjacent two of the holding portions which bracket the distal end portion in the circumferential direction, wherein each connected pair of one of the connecting portions and the end portion of one of the holding portions of the magnet holder has a boundary therebetween whose length in a longitudinal direction of the one of the holding portions is less than or equal to ⅓ of a length of the one of the holding portions.