Patent ID: 11881746
Assignee: NIDEC CORPORATION
Field: Electrical machinery, apparatus, energy (Electrical engineering)
Classification: CPC H | IPC H

Claim 11:
12. A rotor, comprising:
a rotor iron core including electrical steel sheets that are layered in an axial direction, the rotor iron core configured to rotate about a center axis, wherein the rotor iron core includes
a plurality of flux barrier groups, wherein each of the plurality of flux barrier groups includes a plurality of flux barriers, each flux barrier of the plurality of flux barriers has an elongated shape on a cross-section of the rotor iron core, the cross-section being perpendicular to the axial direction, and two ends of said each flux barrier is closer to a circumferential surface of the rotor than an intermediate portion of said each flux barrier, and
a plurality of slot groups penetrating the electrical steel sheets in the axial direction, wherein each of the plurality of slot groups includes a plurality of slots, each slot of the plurality of slots has an elongated shape, only one end of said each slot is adjacent to the circumferential surface of the rotor, and the other end of said each slot is more distant from the circumferential surface than the one end of said each slot, wherein

the plurality of flux barrier groups and the plurality of slot groups are provided at intervals in a circumferential direction of the rotor iron core,
all flux barriers overlapping each other between the center axis and a point on the circumferential surface of the rotor in a radial direction of the rotor iron core belong to one of the plurality of flux barrier groups,
all slots arranged consecutively along the circumferential direction without being intervened by a flux barrier group of the plurality of flux barrier groups belong to one of the plurality of slot groups, and
a number of the plurality of flux barrier groups is larger than that of the plurality of slot groups.