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From: Joseph Legris
X-Mailer: Mozilla 4.77 [en]C-SYMPA (Win95; U)
Subject: Re: HELP WITH INDUCTION SETUP
Date: Thu, 14 Nov 2002 15:27:50 -0500
NNTP-Posting-Date: Thu, 14 Nov 2002 15:27:50 EST
Organization: Bell Sympatico
Gene De Guzman wrote:
> Hi. I do not have any background in Physics or Electronics and I need
> help on induction.
> I bought an induction coil kit from sciencekit.com
> with a primary coil having thick coils of approx. 100 loops and a
> secondary coil with thinner coils of approx. 1000 loops. I have
> attached a 12-Volt DC Motocycle Battery (55 Amps) to the Primary Coil
> and so far I could induce a larger voltage in the secondary coil
> (using a voltmeter for measurement connected to the secondary coil) of
> approximately 60 volts and a lower ampere whenever I turn the switch
> My goal really is to reverse the connection by connecting the Battery
> into the secondary coil (thinner coils with more loops) and induce a
> lower DC voltage and a higher ampere into the Primary Coil (thicker
> with less loops) and this is not happening. What I get is a lower
> voltage (which is expected) but the ampere induced in the Primary is
> lower too instead of higher.... what am I doing wrong? ... need your
> expertise in the construction detail.
> My goal is to use a 12DCVolt/55Amp Battery and induce a
> for a VERY SHORT PERIOD OF TIME like a half second or millisecond over
> and over again.... I thought that this is as simple as having a Coil
> with 1000 loops and another with 100 loops to get a 10 to 1 ratio and
> thereby reducing the voltage by 10 times but increasing the Ampere by
> 10 times... I guess I am missing something. How come it works when I
> try to induce a higher voltage but when I reversed it to induce a
> lower voltage with high ampere it does not work?
> Could anyone help in the setup? I would really appreciate any help.
> Thanks in advance.
A few issues you should address:
1) Is the core saturating magnetically?
2) Are the resistances of the coils low enough?
12 Volts/55 Amps = 0.22 Ohms or less (unlikely).
1.2Volts/550 Amps = 0.0022 Ohms or less (forget it).
3) How are you measuring the pulsed voltages and currents?
You really need an oscilloscope and a current probe, or else some way
of capturing and measuring the peaks.
4) A proper setup will have a primary of very heavy copper wire of maybe
10 turns and a secondary of 1 turn of heavy copper bar (maybe 1 cm
diameter or more) wound coaxially on a big closed ferrite core (probably
a few dozen sq. cm cross-sectional area)
5) You need a precisely timed pulse controller or else the result will
be dangerous. If you attempt to pulse it by pushing a button (a 55 Amp
rated button at that) any misjudgment in timing will fry the button,
burn your transformer and possibly explode the battery.
6) You can get an approximation to what you need (maybe 200 Watts
instead of 600) by taking apart a soldering gun. It runs on AC instead
of pulsed DC and can give you more than 100 Amps at a couple of volts.
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