Wirelessly Powered Tesla Desk Lamp
by macakcat, published
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Wirelessly powered desk lamp operating at 6.5MHz. This particular coil is optimized to power a 25W, vintage, Tesla globe-style light bulb.
Nikola Tesla's wireless power transmission was my inspiration for this project.
Featured article at 3DPrint.com: http://3dprint.com/46711/tesla-desk-lamp/
- Short video and explanation at https://www.youtube.com/watch?v=YBIbn9LA6PQ
Designed by David Choi
In order to power this lamp, you will need to construct at least a 30W resonant induction transmitter. My transmitter is powered by a 30VDC supply. In my setup, I chose 6.5MHz and built the transmitter into the underside of the table. The transmitter is tunable as the receiver is not for aesthetic reasons.
Do not rescale! I printed with a 5th Gen Replicator. The resonant frequencies will change depending on the inductor geometry. I printed with 3 shells, 15% in-fill and 0.2mm resolution. The parts fit together fine for me. Some CA glue in certain areas will be necessary.
The receiving spiral inductor is made with ~7.5ft of 1/8" OD copper tubing and has a final form inductance of approximately 14.1uH. The primary inductance coil is a center-tapped 1/4" copper tube of 2 winds and is approximately 0.34uH. An "extra" resonant coil is put into place beneath the table, whose inductance is not important but area is more so, and is tuned to 6.5MHz as well. This 1/4" OD coil improves efficiency. The power is transferred from the secondary resonator to a single copper loop coupling to the resonator which is directly wired to the bulb. Without going into much detail, two important factors must be addressed. In order to power anything efficiently impedance matching must be top priority. In addition, one helpful equation is the ratio of primary to secondary inductance and input and output voltages given by: Vout = Vin*Sqrt[Ls/Lp], where Lp is the primary inductance and Ls is that of the secondary.
If there is interest in the circuit I will disclose it, but that is beyond the interests of this website.
I intentionally chose a vintage Tesla globe-style bulb reconstruction as a commemoration for his work in wireless power transmission. Were I to have chosen an Edison or Marconi bulb, Tesla would be rolling in his ashes. :)
One of the lamp legs is built in two pieces and has a conduit for the bulb wiring. If you can construct a transmitter, I expect construction of the lamp base to be straight forward.
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Wirelessly Powered Tesla Desk Lamp by macakcat is licensed under the Creative Commons - Attribution - Share Alike license.
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