Dynamo-electric machine | Wikipedia audio article
Channel: wikipedia tts
Date: 2019-07-01

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Dynamo


00:00:51 1 Etymology
00:02:40 2 Description
00:03:41 2.1 Commutation
00:04:53 2.2 Excitation
00:08:13 3 History
00:08:22 3.1 Induction with permanent magnets
00:10:22 3.2 The first dynamos
00:12:25 3.3 Dynamo self excitation
00:13:25 3.4 Practical designs
00:16:20 3.5 Rotary converters
00:18:18 4 Historical uses
00:18:28 4.1 Electric power generation
00:19:17 4.2 Transport
00:19:39 5 Modern uses
00:20:12 6 See also



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SUMMARY
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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 alternator, and the rotary converter. Today, the simpler 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 power rectification devices (such as vacuum tubes or more recently via solid state technology) is effective and usually economical.