[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Request for help with air core transformer/power transfer system



Original poster: "Dr. Resonance" <resonance@xxxxxxxxxx>


You would need some type of magnetic core on both sides of the glass if you operate at 60 Hz. To do it without a mag. core would require a high freq. current.

Dr. Resonance

Resonance Research Corporation
E11870 Shadylane Rd.
Baraboo   WI   53913
----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Monday, December 06, 2004 10:00 PM
Subject: OT: Request for help with air core transformer/power transfer
system


> Original poster: David Speck <dave@xxxxxxxxxxxxxxxx> > > List, > I know this isn't directly TC related, but I hoped someone with more > transformer theory experience that I have might lend a hand, with Terry's > indulgence. Please feel free to respond privately. > > ->Sound enough like electricity transmission without wires ;o)) But > respond direct if not really related to Tesla coils) - T. <- > > I'd like to transmit about 6 volts AC at 60 Hz and 250 mA through a glass > plate about 1/4" thick without drilling a hole in the glass, and without > making any really esoteric circuitry like a high frequency drive > circuit. I don't have a lot of time for experimentation, so I though I'd > run my idea past you and see what you thought. > > I have space to put a 4 1/2" OD flat circular pancake coil (about 1/4" > thick) on each side of the glass. I figured I'd run 6 volts from a wall > wart into the primary, and have a matching secondary directly opposite it, > on the other side of the glass, from which I'd feed a diode bridge and > filter cap on the secondary side.. I know similar arrangements are used to > recharge batteries of implanted medical devices, but I don't know if they > work at 60 Hz or higher frequencies. My main concern is making an > arrangement that will not burst into flames during prolonged unattended > operation. > Questions are: Would it be better to have primary and secondary circuits > with a relative few turns of heavier wire, or lots ot turns of finer > wire. I expect that you'd get more inductance, but more resistive heating > with finer wire, but in the absence of an iron core to corral the magnetic > flux, I worry about drawing too much current from the wall wart into the > primary with a few turns of thicker wire. > Is there a way to calculate the optimum number of turns and wire size for > this arrangement? > > Is there any simple arrangement of soft iron wire or sheet that would help > to constrain/direct the magnetic flux for better energy transfer without > involved magnetic core fabrication? > > Thanks in advance for your thoughts. > > Dave > > > >