Welcome to
Science a GoGo's
Discussion Forums
Please keep your postings on-topic or they will be moved to a galaxy far, far away.
Your use of this forum indicates your agreement to our terms of use.
So that we remain spam-free, please note that all posts by new users are moderated.


The Forums
General Science Talk        Not-Quite-Science        Climate Change Discussion        Physics Forum        Science Fiction

Who's Online Now
0 members (), 181 guests, and 2 robots.
Key: Admin, Global Mod, Mod
Latest Posts
Top Posters(30 Days)
Previous Thread
Next Thread
Print Thread
#37061 01/12/11 04:00 PM
C
cwherbs
Unregistered
cwherbs
Unregistered
C
I'm trying to set up a magnetic generator with copper coils. I'm brand new to electronics.

I've read that the coils will create AC current, but I've also read that it will create DC current which can go straight to a battery. Now the AC current must so through something to switch it to DC before the battery right?

I need some reliable information here. Has anyone done anything like this or know enough about current to help out? I'm thinking about using an old car alternator. That will put out AC current right?

How do you create DC current alone?

Thank you for any help!

.
#37068 01/13/11 02:51 AM
Joined: Dec 2010
Posts: 1,858
B
Megastar
Offline
Megastar
B
Joined: Dec 2010
Posts: 1,858
Using an alternator off of a car there is no problem. The
alternator has diodes in it that rectify the AC to DC.
Old generators on cars used brushes to do the job, but
after the development of diodes that would do the job it
got a whole lot better.

Bill Gill

Bill #37150 01/20/11 02:55 AM
Joined: Oct 2004
Posts: 1,696
Megastar
Offline
Megastar
Joined: Oct 2004
Posts: 1,696
Originally Posted By: Bill
Using an alternator off of a car there is no problem. The
alternator has diodes in it that rectify the AC to DC.
Old generators on cars used brushes to do the job, but
after the development of diodes that would do the job it
got a whole lot better.

Bill Gill


Originally Posted By: Mike Kremer


Bill is quite right. A car alternator bought from a scrap yard. Will generate an AC current/voltage when turned by an external source. (14 volts at 15 Amps say)
All AC motors when turned externally....will produce an AC voltage/current..
Those AC motors that do not have Magnets surounding the
rotor, will have a seperate field winding (surounding the rotor). Their Field winding may need to be connected to a 6v-12 volt battery ....to provide the required Magnetic field.
However all DC motors, especially small model car motors, model train motors and similar...all have Magnets surounding their rotor. So if you connect a DC voltage to them of between 3-12 volts, they will run at quite a High speed.
Now all these type of Model motors will generate a DC output voltage, when driven externally.
A bicycle , or a propellor fixed to its shaft will generate the equivalent Voltage (that the motor originaly used to run with) back. If you only use a low powered item like a torch bulb, The motor will turn in a light wind, and lite the bulb. A heavier load will make your model motor progressivly harder to turn.
Idea-
For a simple experiment...grab a 12volt brushless computer fan...blow a hair dryer into it....It should give out a + or - ve voltage dependent on which way you use the hair dryer to blow the 'puter fan round. It will only output a few milli-amps ...check it out with your DC voltmeter.



.

.
"You will never find a real Human being - Even in a mirror." ....Mike Kremer.



Link Copied to Clipboard
Newest Members
debbieevans, bkhj, jackk, Johnmattison, RacerGT
865 Registered Users
Sponsor

Science a GoGo's Home Page | Terms of Use | Privacy Policy | Contact UsokÂþ»­¾W
Features | News | Books | Physics | Space | Climate Change | Health | Technology | Natural World

Copyright © 1998 - 2016 Science a GoGo and its licensors. All rights reserved.

Powered by UBB.threads™ PHP Forum Software 7.7.5