Patent ID: 7855486

Claim:
A claw pole generator comprising: a circularly arranged permanent magnet; and an internal stationary unit including a ring-shaped coil arranged radially inward of the permanent magnet and a yoke surrounding a perimeter of the coil, the permanent magnet being rotatably arranged with respect to the internal stationary unit, the yoke including a stator yoke and a core yoke, with the stator yoke being arranged between the coil and the permanent magnet, and the core yoke being arranged radially inward of the coil and magnetically coupled to the stator yoke, the stator yoke including a first laminated yoke and a second laminated yoke, with each of the first and second laminated yokes including at least two plate-like pieces having a substantially circular disc-shaped connecting portion arranged on one side of the coil and a plurality of outer circumferential yoke portions that are folded over from an outer circumferential surface of the connecting portion and arranged between the coil and the permanent magnet with circumferential spaces in-between, and the connecting portions of each of the first and second laminated yokes having a plurality of connecting layers overlying each other in an axial direction with respect to an axial centerline of the coil, each of the outer circumferential yoke portions having a plurality of outer circumferential yoke layers laminated overlying each other along a radial direction with respect to the axial centerline of the coil, each of the outer circumferential yoke portions having an outermost one of the outer circumferential yoke layers that is closest to the permanent magnet with a longer axial length than an innermost one of the outer circumferential yoke layers.