Patent ID: 7948137

Claim:
A rotor comprising: a core extending in a predetermined direction; and a magnet buried in said core and having pole faces extending in said predetermined direction, said core having a first part formed by a magnetic material and facing one of said pole faces, at least one of ends of said magnet defined in said predetermined direction protruding forward in parallel to said predetermined direction with respect to an end of said first part, said end of said first part being on the same side with said at least one of said ends of said magnet, said magnet including a plurality of magnets arranged in a loop, said core having first gaps and second gaps both extending in said predetermined direction, each of said first gaps extending in a first direction perpendicular to said predetermined direction, each of said first gaps holding said magnet buried therein, each of said second gaps being defined at an end of each of said first gaps in said first direction, each of said second gaps extending in a second direction perpendicular to said predetermined direction, said core further having a third part formed by a magnetic material and arranged between adjacent ones of said second gaps, and at least one of ends of said third part defined in said predetermined direction protruding forward in said predetermined direction with respect to the ends of said adjacent ones of said magnets, said ends of said adjacent ones of said magnets being on the same side with at least one of said ends of said third part.