System for inductive transmission of electrical power to lamp of bicycle, has secondary winding movable at fixed coupling strength, where maximum coupling strength is invariant against displacements of winding along gravity direction

摘要

The system has a secondary winding (41) insertable in a space covered by a primary winding (30) and movable and/or displaceable at fixed coupling strength in a gravity direction when reaching a position of maximum inductive coupling. A region axially covered in a winding axis direction and/or an insertion direction of the primary winding overlaps with a covered region of the secondary winding. Maximum coupling strength is invariant against displacements of the secondary winding along the gravity direction. The gravity direction is vertical to the insertion direction. The primary and secondary windings are designed as ring windings.