| Author |
electromagnet power control
|
|
|
| dear people
I have a few gel filled 12 volt batteries that are rated 7 amp hour.
iwould like very much to know if there would be a way to combine 4 of these
for a field power supply and be able to regulate the amperage and volts as
needed. i am trying to power approximately 8 electromagnets and would like
to keep the amps down. the amps seem to go way out of range on only one
coil.i have seen these magnets by themselves draw high amps off these
batterys in all types of arrange ments. i am not very privy to the type of
electronics needed to do such a thing. But would try to put together
something if someone could help with a schematic, w/ a few explanations. I
am trying to keep it simple. i would very much appreciate any insight
available.
| |
|
| jp wrote:
> dear people
> I have a few gel filled 12 volt batteries that are rated 7 amp hour.
> iwould like very much to know if there would be a way to combine 4 of these
> for a field power supply and be able to regulate the amperage and volts as
> needed. i am trying to power approximately 8 electromagnets and would like
> to keep the amps down. the amps seem to go way out of range on only one
> coil.i have seen these magnets by themselves draw high amps off these
> batterys in all types of arrange ments. i am not very privy to the type of
> electronics needed to do such a thing. But would try to put together
> something if someone could help with a schematic, w/ a few explanations. I
> am trying to keep it simple. i would very much appreciate any insight
> available.
>
>
Yes. You'll have to post the specifications you need
to get a detailed reply.
Ed
| |
|
| I'm sorry I am doing a little project {Styrofoam Cutting Station} of my
own right now & haven't been much help lately.
- On Your Battery Dilema -
~ It may help you to know these facts ~
When you place the batteries in parallel {all (+)'s together & all (-)'s
together} the current increases & the voltage remains the same.
When you align them in series {+ to - battery to battery} the voltage
increases & the current remains the same.....
Roy Q.T.
Urban Technician
[I don't make em, I just fix em]
| |
|
| Roy wrote:
> I'm sorry I am doing a little project {Styrofoam Cutting Station} of my
> own right now & haven't been much help lately.
>
> - On Your Battery Dilema -
> ~ It may help you to know these facts ~
>
> When you place the batteries in parallel {all (+)'s together & all (-)'s
> together} the current increases & the voltage remains the same.
No disagreement with your post, just further information.
Your post addresses the supply capability, but does not
address what happens at the load (the electromagnet).
In addition to what you posted, the op needs to know
what happens at the load, which is discussed below.
When you look at the circuit to see what happens at the
electro-magnet, both the voltage applied to the electromagnet
and the current through it remain the same (unless the orginal
battery is not capable of supplying all the current the load
will draw). The total current *available* increases, but if
the voltage applied to the load remains the same, the current
through the load will remain the same.
>
> When you align them in series {+ to - battery to battery} the voltage
> increases & the current remains the same.....
Again true of the *supply* voltage & current. But at the load,
both the voltage and current delivered to the load increase
if you put the batteries in series.
Ed
>
> Roy Q.T.
> Urban Technician
> [I don't make em, I just fix em]
>
| |
| Stuart 2007-10-15, 5:25 pm |
| In article <18121-47133EFE-529@storefull-3251.bay.webtv.net>,
Roy <ROYKEY@webtv.net> wrote:
> When you place the batteries in parallel {all (+)'s together & all (-)'s
> together} the current increases & the voltage remains the same.
And unless you diode them you can get large circulationg currents because
the terminal emf of one will inevitably be different to another and they
will try to charge/discharge each other
--
Stuart Winsor
From is valid but subject to change without notice if it gets spammed.
For Barn dances and folk evenings in the Coventry and Warwickshire area
See: http://www.barndance.org.uk
| |
|
| Those are very valid arguments about current flow & battery
strength....If you want to design your own electromagnet all our
comments could help, but there are some constants & materials that must
be met...Since we do not know the nature of your core or how you plan to
construct or what sort of electromagnet you have..... Here is a webpage
I found that has some very helpful & professional tips..
http://www.geocities.com/CapeCanaveral/2404/Elect67.htm
You may want to scroll down a bit & look at the schematic diagram for a
power supply model....
Roy Q.T.
Urban Technician
[I don't make em, I just fix em]
| |
|
| Some more cool stuff with electromagnets - this is rather crude mainly
fun stuff - I am going to try the Jacobs Ladder with a Neon Sign PS I
picked up the other day...
http://www.coolmagnetman.com/magelect.htm
Good Luck ! ! !
Roy Q.T.
Urban Technician
[I don't make em, I just fix em]
| |
|
|
Roy wrote:
> Some more cool stuff with electromagnets - this is rather crude mainly
> fun stuff - I am going to try the Jacobs Ladder with a Neon Sign PS I
> picked up the other day...
>
> http://www.coolmagnetman.com/magelect.htm
>
> Good Luck ! ! !
I don't know what a Jacobs Ladder has to do with electromagnets, but I
can tell you that a Neon sign transformer easily makes a truly fine
one! SIgn transformers are great because they have built in current
limiting which protects the transformer. (An arc is basically a
short!) A couple of pieces of stiff copper wire and you are ready to
make that B movie! Just be sure the two rails are close enough at the
bottom to get the arc started.
Good Luck!
| |
|
| From: bjacoby@iwaynet.net (Benj)
Roy wrote:
Some more cool stuff with electromagnets - this is rather crude mainly
fun stuff - I am going to try the Jacobs Ladder with a Neon Sign PS I
picked up the other day...
http://www.coolmagnetman.com/magelect.htm - Good Luck ! ! ! -
-----
I don't know what a Jacobs Ladder has to
do with electromagnets, but I can tell you that a Neon sign transformer
easily makes a truly fine one! SIgn transformers are great because they
have built in current limiting which protects the transformer. (An arc
is basically a short!) A couple of pieces of stiff copper wire and you
are ready to make that B movie! Just be sure the two rails are close
enough at the bottom to get the arc started.
Good Luck!
----------------
Benj ~ The webpage I posted above has alot of electromagnet stuff but
also a Jacobs Ladder idea & I am gonna try it out later on with what I
got.Thanx for the tip.
Roy Q.T.
Urban Technician
[I don't make em, I just fix em]
| |
| Don Kelly 2007-10-26, 3:25 am |
|
----------------------------
"Roy" <ROYKEY@webtv.net> wrote in message
news:3152-47146897-500@storefull-3258.bay.webtv.net...
> Some more cool stuff with electromagnets - this is rather crude mainly
> fun stuff - I am going to try the Jacobs Ladder with a Neon Sign PS I
> picked up the other day...
>
> http://www.coolmagnetman.com/magelect.htm
>
> Good Luck ! ! !
>
> Roy Q.T.
> Urban Technician
> [I don't make em, I just fix em]
>
A Jacob's ladder with a neon sign transformer as a source works very nicely.
The transformer has a high enough impedance to limit the current
sufficiently to get a dramatic arc but not an excessive one that won't go
out to start the next "ladder". If I recall correctly (been some 20 years or
more) about 1-2 inch gap at bottom and 6-8 at top is typical for a 15kV
neon transformer.
--
Don Kelly dhky@shawcross.ca
remove the X to answer
|
|
|
|