Dynamo copertina

Dynamo

Dynamo

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A dynamo is an electrical generator that creates direct current using a commutator, and uses self-powering electromagnets for the stator field rather than permanent magnets. Dynamos are self-starting by using residual magnetic field left in the iron cores of the electromagnets (i.e. field coils). If a dynamo were never run before, it was usual to use a separate battery to excite or flash the field of the electromagnets to enable self-starting. Dynamos were the first practical 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 alternator, and the rotary converter. Today, the simpler and more reliable alternator dominates large scale power generation, for efficiency, reliability and cost reasons. A dynamo has the disadvantages of a mechanical commutator. Also, converting alternating to direct current using rectifiers (such as… Read by JohnAnkerBow. Recorded January 7, 2020; the article may have changed since. The article as it stood when recorded: https://en.wikipedia.org/w/index.php?oldid=934641900 Article today: https://en.wikipedia.org/wiki/Dynamo Original recording: https://commons.wikimedia.org/wiki/File:Dynamo.ogg License: CC BY-SA 4.0 (https://creativecommons.org/licenses/by-sa/4.0). This episode is a format-shifted (MP3) copy redistributed under the same license. This show is an independent community project, not affiliated with or endorsed by the Wikimedia Foundation.
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