Patent ID: 8836186

Claim:
A bus bar device electrically connecting a plurality of coils arranged along a circumferential direction to form an annular shape in entirety, wherein the bus bar device includes the circumferential direction, a radial direction, and an axial direction, the bus bar device comprises: a plurality of bus bars arranged to form a plurality of layers in the radial direction, wherein each of the bus bars is formed from an arc-shaped conductive wire; a plurality of connection wires respectively connected to the coils, wherein the connection wires are arranged to overlap the bus bars in the axial direction and intersect with the bus bars; an arc-shaped or annular bus bar holder, wherein the bus bar holder holds the bus bars so as to restrict movements of the bus bars in the radial direction, wherein the bus bars and the connection wires intersect at intersection portions including connection intersection portions at which the plurality of connection wires is electrically connected to the bus bars, and wherein the bus bar holder includes a hole-shaped connecting portion located at a portion of the bus bar holder corresponding to the connection intersection portion and extending through the bus bar holder along the axial direction.