Friction-free dynamo for bicycle lighting

摘要

The friction-free permanent magnet dynamo comprises an aluminium or plastic disk (1) attached to the spokes of the rear wheel. Around the outer edge are fastened several permanent magnets (2). On the frame of the bicycle is wound the stator winding (3) with an iron core and past which the magnets rotate. This allows the continuous generation of an alternating voltage which can be rectified and used to supply a set of rechargeable batteries, and thereafter lamps, horn, indicator lamps, and even a radio.