Experience with bendini motor

I have just came across the bendini motor but it doesn’t make sense. I get the two coils which act as a transformer in capturing the high voltage emf spike but don’t get the use of the magnet on a wheel. YouTube shows lots of people using them for battery charging yet I feel that that high voltage emf spike could be used to power another coil. The configuration would be a low voltage coil that generates a current as the magnet passes and feeds that low voltage to bifular coil. The bifular coil would generate a high voltage spike that is fed to another coil that repels the magnet. To clear things up a bit the first coil (generator )is at 0 degrees and the second coil ( motor / pusher coil ) is at 15 degrees. The bifular coil is located elsewhere. The power output is regulated by the power requirements of the generator. So that if the generator is receiving a input power of 100 watts and and the generator requires 120 watts to operate the bifular coil is fed enough voltage to generate the extra 20 watts needed Using the emf spike. Think of a low shaft input power situation. Could that low shaft power be aided by the emf spike. If total generator capacity is 120 watts and 20 watts is diverted to the bifular coil to aid shaft power while generator out put is still at 100 watts is it not an advantage to capture that back emf and return the power to the shaft. For example the generator produces 12 volts and 2 volts are diverted to the coil to create extra shaft power or the alternative is to have a slower shaft speed and lower generator out put. With the bendini motor why aren’t they feeding that emf spike into another coil and creating shaft horsepower.

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Sounds like a scam to me…

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It works. It’s not over unity but I can’t work out why it’s not configured to add that high voltage emf back to a coil. Why is it not adding power back to a shaft as in a electric motor with a generator coil. Two in one.

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Hi Rodney
Sort of agree with Rooppoor212784 here. The laws of Physics say you can never get more out of a device than you put in. In fact you get less as there are always some losses present. If you could get more or as you put it be “over unity” you would have “perpetual motion” and people of great intelligence have been trying to achieve this for centuries.

I think the closest approach to this would be the old CRT TV sets where the “flyback” voltage developed with the collapsing field in the deflection coils was utilised to generate the EHT voltage for the CRT.
Cheers Bob

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No-one is suggesting that this is perpetual motion. OP is simply wondering why the available power from the EMF spike is not used. “…is it not an advantage to capture that back emf and return the power to the shaft.” (emphasis added). Even the EBay advertisers are careful to call them ‘pseudo perpetual motion’.


That’s the question. Not an electronics guru so don’t understand why it is configured why it is.

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Hi Rodney,

Great question, definitely more in the physics realm.

Not quite, the limiting factor of the whole system will be the input power, to get a better understanding of how each of the components work I’d suggest checking out some circuit simulating software such as Falstad or LTSpice.

As soon you a second coil is added (now making a transformer), a higher impedance will be present on the coil(you have to energise the coupled coil as well, along with the subsystem connected to it).
Check out this video by Tom Stanton using Eddy currents to move a bike, this is a very extreme version of trying to pull every bit of energy using magnets and coils (a solid slab of metal, a shorted coil).

You’ve most likely used motors that use a similar technique to power the rotor: AC motor - Wikipedia


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