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2. Bottle dynamo - Wikipedia

   en.wikipedia.org/wiki/Bottle_dynamo

   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. Hub dynamo - Wikipedia

   en.wikipedia.org/wiki/Hub_dynamo

   Bicycle dynamos instead use permanent magnets to eliminate the need for a battery to excite the field and initiate electrical generation. Shimano offers a variety of hub dynamos under the "Nexus" brand, such as the DH-3N70/DH-3N71, advertised as having significantly less drag than the Nexus NX-30. SRAM manufactured the i-Light hub dynamo until ...

4. Dynamo - Wikipedia

   en.wikipedia.org/wiki/Dynamo

   "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 ...

5. List of bicycle parts - Wikipedia

   en.wikipedia.org/wiki/List_of_bicycle_parts

   Hub dynamo: a generator inside one of the hubs for powering lights or other accessories Hub gear : a gearbox mounted inside the hub, 3-speed is common, 5, 7 are available ("Sturmey-Archer"), Enviolo makes a CVT , and Rohloff makes a 14-speed hub.

6. Schmidt Original Nabendynamo - Wikipedia

   en.wikipedia.org/wiki/Schmidt_Original_Nabendynamo

   Schmidt hub dynamo disk brake. ... (SON) is a manufacturer of high-efficiency and low-drag bicycle hub power generators and other electric bicycle gear. [1] [2] [3 ...

7. Magneto - Wikipedia

   en.wikipedia.org/wiki/Magneto

   Most commonly, a small magneto, termed a bottle dynamo, rubs against the tire of the bicycle and generates power as the wheel turns. More expensive and less common but more efficient is the hub dynamo that rotates neodymium magnets around a copper coil in a claw pole cage inside the hub of a wheel.