Exactly. Bedini's promising a motor which runs itself for free and generates free power. Back EMF is a real term- but it's a well understood effect and that's not what it does at all. Back EMF is just the force where you have a 0.2 ohm DC motor coil, put 12v across it and it consumes only 500mA. Why not 12v/0.2ohms=60amps? Because while the motor is turning it produces a back EMF voltage in the winding nearly equal to the source voltage. In fact for a permanent mag DC motor you can cut off the power and measure the voltage it generates because it's acting as a generator. That's how a permanent mag DC generator works. It gives no power for free, though. Like any generator, any attempt to draw power off the windings slows down the motor shaft and it takes more energy in the form of engine torque or electrical input to sustain the speed. He tried to make it look legitimate with patents, but the US patent office no longer performs any kind of scrutiny on a patent except for document format. As long as it looks like a patent they'll file it. Wikipedia: "Bedini's electronics company markets a compact disc "clarifier" which is purported to improve the audio and video of CDs and DVDs by spinning the discs whilst bathing them with "electromagnetic beams" prior to being played. These claims have been controversial amongst audiophiles and were criticised by popular skeptic James Randi ." Danny Matthew Miller wrote: > On Sun, Oct 05, 2008 at 02:11:23PM +1300, Jinx wrote: > >> I did a quick Google and found many references to recovering or >> capturing the back EMF energy, including this lengthy submission, >> a bit too lengthy for me to read right now >> >> http://www.rexresearch.com/bedini/bedini.htm >> > > You should read that webpage with extreme skepticism. It seems the author > thinks that back-EMF is some kind of free enery what will allow electric > motors to output more work than is supplied as input. Of course, the author > doesn't say this clearly, but instead hides this behind a bunch of jargon. > > The rest of the website is full of kooky topics. Good luck to anyone finding > wheat among all the chafe on that site. > > Matthew > -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist