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A hub dynamo is a small electrical generator built into the front hub of a bicycle wheel that is usually used to power lights. Often the hub "dynamo" is not actually a dynamo, which creates DC, but a low-power magneto that creates AC. Most modern hub dynamos are regulated to 3 watts at 6 volts, although some will drive up to 6 watts at 12 volts.
Bottle dynamo mounted on a bicycle. Dismantled bottle dynamo. Left: Housing with internal permanent magnet rotating through the friction wheel. Right: Induction coil. A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights.
3 volt: Often supplied by 2 AA or C/D cell batteries. 6 volt: Sometimes 4 AA batteries or lead-acid batteries are used; also supplied from a bottle- or hub dynamo. 9 volt: Sometimes supplied by a PP3 battery. 12 volt: Mostly supplied by sealed lead-acid batteries. The main advantage with this voltage is versatility of the electric system, such ...
The Dynohub was Sturmey-Archer's hub dynamo (generator) for bicycles. The initial GH12 12-volt model was introduced in 1936 and followed two years later by the GH8. This 8-volt unit was discontinued in 1941 and replaced in 1945 by the lighter-weight GH6 6-volt version, which remained in production until 1984.
"Dynamo Electric Machine" (end view, partly section, U.S. patent 284,110) A dynamo is an electrical generator that creates direct current using a commutator.Dynamos were the first electrical generators capable of delivering power for industry, and the foundation upon which many other later electric-power conversion devices were based, including the electric motor, the alternating-current ...
Demonstration hand-cranked magneto made circa 1925, on display at the Musée d'histoire des sciences de la Ville de Genève. 2kW Société de l'Alliance magneto generator for arc lamps, of around 1870. A magneto is an electrical generator that uses permanent magnets to produce periodic pulses of alternating current.