Patent ID: 8638021
Filing Date: 2014-01-28
Classification: H02K

Abstract:
1. A rotating electrical machine comprising: a rotor; and a stator including an annular stator core formed by helically stacking a plurality of core pieces that are connected to each other by connecting portions, the rotor being disposed inside an inner periphery of the stator core, wherein each of the core pieces includes a main core portion and a sub-core portion, the main core portion being provided at the inner periphery of the stator core and having a tooth portion at the inner periphery of the stator core, the sub-core portion being provided at an outer periphery of main core portion, the tooth portions of the main core portions being spaced apart from each other in a circumferential direction of the stator core to define slots between the tooth portions, wherein the core pieces are connected to each other by the connecting portions provided at boundaries between the main core portions and the sub-core portions, wherein the connecting portions are arranged along a stacking direction of the stator core so that first grooves that extend in the stacking direction of the stator core are formed in an outer peripheral surface of the stator core at positions where the connecting portions are provided, wherein a maximum width of the first grooves in the circumferential direction is greater than a maximum width of the slots in the circumferential direction, wherein the stator includes a frame provided at an outer periphery of the stator core, and wherein the rotating electrical machine further comprises: