Hub dynamo
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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
A Schmidts Original Nabendynamo (SON) brand hub dynamo
Another SON dynamo
A Shimano dynamo hub
Stator within the hub shell. The gap between them is barely visible.
Bottle dynamo
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A bottle dynamo or sidewall dynamo is a small electrical generator for bicycles employed to power a bicycle's lights. The traditional bottle dynamo is not actually a dynamo at all, but a low-power mag
Hub dynamo
…at 12 volts. The market was largely pioneered by Sturmey-Archer with their Dynohub of the 1930s–1970s. This competed effectively with contemporaneous bottle dynamos and bottom-bracket generators, but the Dynohub was heavy with its steel housing and was discontinued in the 1980s. Around 2009, Sturmey-Archer released…
Bottle dynamo mounted on a bicycle
Dismantled bottle dynamo. Left: Housing with internal permanent magnet rotating together with the friction wheel. Right: Induction coil