Are generators built like an alternator of a generator

[frankiee]

Are power generators such used for home emergency power and the generation of power by a nuclear power plant built such as an alternator or like a generator where the armature revolves??

 

[itsmoked]

No. The rotating member is a rotor with a static magnetic field,(varies for control), that sweeps the fixed stator coils where the resultant output is delivered from.

Most all modern machines use this format.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[waross]

Yes, as Keith says, The the power windings are in the stator. The magnetic field is in the rotor. It was not always this way. I used to run across old stationary field gen-sets where the power was produced in the rotor. The power was taken off with slip rings. A good friend of mine ran one as prime power for his home until about 7 or 8 years ago when he was able to connect to the grid. As I remember it was about 12 KW, diesel powered. We were all glad to see it go.
Historically, a small rotating field machine would have a small DC generator on the end of the shaft to produce exciting current. You had one set of brushes on the commutator taking the DC current off and another set of brushes supplying the DC to the rotating field. Compared to that, some manufacturers opted for a stationary field and used slip rings to extract the output energy from the rotating main windings.
With the perfection of silicon diodes brushless exciters became more common. There are many larger machines (20 KW and up) with rotating magnetic fields that have been converted from brush excitation to brushless excitation and are still in service.
The stationary field machines have not, to my knowledge, been built for many years, and very few remain in service.
respectfully