| 摘要 |
PROBLEM TO BE SOLVED: To provide a power generation hub wherein a coil winding work is performed smoothly and the number of magnetic poles is easily adjusted according to the demand for power.SOLUTION: A flange wall 21 of a bobbin 20 has an outer peripheral surface 216 that is formed as a smooth annular surface with no unevenness. Two magnetic yoke discs 30 are provided on both sides in the axis direction of a portion 11 for mounting a hub shaft 10 while being in contact with the corresponding outside surfaces 212 of the bobbin 20. The two magnetic yoke discs 30 are each formed with a plurality of yoke projections 32 projecting at equal intervals in the peripheral direction so that a plurality of recessed portions 33 are formed in the peripheral direction in a staggering manner. When manufacturing the power generation hub 100, the number of recessed portions 33 of only the magnetic yoke discs 30 is selected according to the demand for power. So, a magnetic yoke disc 30 having as many recessed portions as necessary can be selected to meet a desired number of magnetic poles, and there is no need of changing the structure of the bobbin 20. |
