Piezo & Magnetics/flux

[rave154]

Hi all,

came across this patent the other day by chance, seems an interesting slant on the "manipulation of flux lines via coils etc" ALA hildenbrandt & Flynn & others..anybody ever tried anything like this?

Acoustic-magnetic power generator - Google Patents

[Electrotek]

Hi all,

came across this patent the other day by chance, seems an interesting slant on the "manipulation of flux lines via coils etc" ALA hildenbrandt & Flynn & others..anybody ever tried anything like this?

Acoustic-magnetic power generator - Google Patents

That's one of the projects I'm working on. (One of my contacts on another list tipped me off.) I've found it isn't as easy as the patent implies.

The first thing I discovered is that it's very hard to wind a suitable transformer on a ring magnet. I managed to get 30 turns on one side and 40 on the other. With this assembly, no sound came from the transducer unless it was in series with the coil, rather than parallel as shown. However, the large transducer stack does work in parallel with a coil from a MO fan motor. This coil has probably 300 to 500 turns.

I also found that putting the output into a small, high powered speaker doesn't produce any output sound at all. It may be there's something left out of the patent. For instance, there may need to be a 90 degree phase shift between the coil and the transducer. Logically, this is what would be needed to make the magnetic particles wobble.

At this point, the only step I can see next is to place two motor coils between two magnets and see if this will work as a transformer. Unless a signal will go through the transformer I don't see how it can be amplified. But this device warrants further work since the patent states they can be cascaded, for "power amplification". This would give considerably more power out than in.