| 摘要 |
PURPOSE:To simplify the structure and also reduce a cogging quantity by arranging a rotor gear and a substrate opposite each other with a specific gap in the axial direction of a rotating shaft, and using the rotating shaft as part of a magnetic path. CONSTITUTION:As the rotating shaft 13 rotates, the rotor gear 16 coupling with it also rotates together. A magnet 17 and substrate 18, on the other hand, are fixed to a bearing 15. At this time, a high-density part of magnetic flux crosses the rotating direction in the gap G because the rotor gear 16 has a tooth part 16a. Therefore, the magnetic flux depending upon the conductive pattern of the substrate 18 varies according to the rotation of the rotor gear 16, and consequently a current corresponding to variation of the magnetic flux is generated at the conductive pattern 18a. |
