The Engineer's Place for News and Discussion®

 Previous in Forum: Electrically Conductive Glue for a Carbon Brush Next in Forum: Faraday Homopolar Generator - Current Flow Question

Subscribe to Discussion:

CR4 allows you to "subscribe" to a discussion
so that you can be notified of new comments to
the discussion via email.

Anonymous Poster

Excitation current

03/08/2009 8:43 PM

Why is DC used to excite a generator field?

Interested in this topic? By joining CR4 you can "subscribe" to
Guru

Join Date: Oct 2008
Location: 34° 34' 21.60" N, 92° 55' 42.28" W
Posts: 20948
#1

Re: Excitation current

03/08/2009 9:52 PM

Because AC won't.

__________________
Luck comes and goes. Skill is forever. Intelligence either is, or it ain't. lyn
Power-User

Join Date: Dec 2007
Location: Sydney Australia
Posts: 478
#2
In reply to #1

Re: Excitation current

03/08/2009 10:07 PM

I was going to say..."Because it feels Better!"

Regards,
Sapper.

__________________
It's all about the Boom! - MythBusters
Guru

Join Date: Mar 2007
Posts: 2550
#4
In reply to #2

Re: Excitation current

03/08/2009 10:13 PM

or you want poles apart.

__________________
Fantastic ideas for a Fantastic World, I make the illogical logical.They put me in cars,they put me in yer tv.They put me in stereos and those little radios you stick in your ears.They even put me in watches, they have teeny gremlins for your watches
Power-User

Join Date: Dec 2007
Location: Sydney Australia
Posts: 478
#3

Re: Excitation current

03/08/2009 10:13 PM

A Generator works by passing a Conductor through a stable Magnetic Field.

A magnetinc field produced by AC will fluctuate and\or the poles reverse depending on the frequency.

A DC field on the other hand is stable, doesn't fluctuate or vibrate and always has the poles in the same place.

As such DC is always preferable to power the magnetic coils used to provide the excitation of the generator.

Regards,
Sapper

__________________
It's all about the Boom! - MythBusters