Patent ID: 9472985
Filing Date: 2016-10-18
CPC Classification: H02K

Claim Text:
1. A rotor yoke, comprising: a plurality of rotor cores laminated to be formed in a cylindrical shape, each of the plurality of rotor cores possessing a disk shape; a plurality of magnet inserting holes, each including a longitudinal side and a transverse side arranged on a surface of the rotor cores orthogonal to a rotation shaft, the longitudinal sides of the magnet inserting holes being arranged separately from one another near an outer circumferential surface of the rotor cores along a circumferential direction, the magnet inserting holes penetrating the rotor yoke in a laminating direction of the rotor yoke; a bridge portion arranged between two of the magnet inserting holes that are adjacent to one another in a circumferential direction of the rotor cores, the bridge portion connecting an inner area arranged radially inward of the magnet inserting holes to an outer area arranged radially outward of the magnet inserting holes; a recessed portion arranged at the bridge portion and formed from the outer circumferential surface of the rotor cores toward a radially inward direction; a protruding edge of one of the magnet inserting holes being arranged at the bridge portion and protruding toward an inside of the one magnet inserting hole, the protruding edge including a most protruding edge at a portion of the transverse side of the one magnet inserting hole; and the protruding edge forming first and second clearance portions when a magnet is located in the one magnet inserting hole, the first clearance portion being formed by one end of the transverse side of the one magnet inserting hole and being recessed toward an outside of the one magnet inserting hole, and the second clearance portion being formed by another end of the transverse side of the one magnet inserting hole and being recessed toward the outside of the one of the magnet inserting holes.