Why alternator is preferred to dc generator?

Answer 1

DC generators are always useful in case of power outages. Many commercial companies use generators as back up units. DC generators are also energy efficient.

Answer 2

Advantages and disadvantages of AC and DC generators?

(1) AC Generators are mostly Maintenance free,no brushes
2) Transmission easy, easily step up & step down
3)Transmission cable size can be thinner because of step up feature
4)Size of the Generator comparatively smaller than Dc machine
5) Generator cooling is easy with Hydrogen because of brushless no sparking.
6) Losses are comparatively less than DC machine
7) Ac Generator breakers are comparatively smaller than Dc breakers
8)Ac Generator are silent operator compare with Dc Generator.
9) Dc Generator, Dc used machine Speed control is very precession any RPM we can achieve with controller, where as Ac we can achieve by Gears only.I hope I

have given few important points many more we can add.

Answer 3

An alternator can charge the battery with the engine idling. Unlike a generator that only charges when the engine is running at higher rpms. The alternator also can support higher amperages that is needed in modern cars with lots of electronics. The alternator is also more reliable than a generator with far fewer failures. Most alternators have the voltage regulator built into the alternator unlike the generator that uses an external voltage regulator that fails quite often.

Answer 4

AC is preferred for power transmission because changing the voltage to a high value for transmission over a long distance, and then back down again for the users, is easy with a transformer. Transformers don't work with DC.

Answer 5

See : http://www.allpar.com/eek/alternators.html

Answer 6

'Alternator' is simply another name for an a.c. generator.

Answer 7

It isn't. A DC generator is better if you want DC, but an AC generator is better if you want AC.