Patent ID: 7002280

Claim:
A bicycle claw-pole generator comprising: a permanent magnet unit extending in a circumferential direction; a coil disposed radially inwardly of the permanent magnet unit; a yoke surrounding the coil, wherein the permanent magnet unit rotates relative to the yoke around an axis, wherein the yoke comprises: a plurality of laminated first yoke arms disposed on a first axial side of the coil, each first yoke arm having a first yoke arm radially outer portion and a first yoke arm radially inner portion, and each first yoke arm comprising a plurality of circumferentially laminated first plate-shaped pieces; a plurality of laminated second yoke arms disposed on a second axial side of the coil, each second yoke arm having a second yoke arm radially outer portion and a second yoke arm radially inner portion, and each second yoke arm comprising a plurality of circumferentially laminated second plate-shaped pieces; wherein each first yoke arm radially inner portion faces a corresponding second yoke arm radially inner portion in the axial direction; wherein the plurality of first yoke arm radially outer portions extend axially toward the second axial side of the coil; wherein the plurality of second yoke arm radially outer portions extend axially toward the first axial side of the coil; and wherein the plurality of first yoke arm radially outer portions are interleaved with the plurality of second yoke arm radially outer portions in a circumferential direction.