Thomas Lehmann wrote:

> of course you are right from the electrical point of view.
> The coil of an electromagnetic vibrator accepts a
> lot of different waveforms.
> When you are looking at the mechanical waveshape of the move-
> ment of the part, it is unsymetrical.

Sorry Thomas, I thought you meant the electrical
waveform.


> The part to be moved, is accelerated from the vibrator surface against
> the force of gravity, so the part leaves the surface and will do a parabolic
> movement.
> During the "flighttime" the vibrator surface moved back a little and
> the part falls down to the surface and is accelerated again.
>
> If the acceleration of the parts is low (ex.: heavy mass) they did not leave
> the surface and
> movement of the parts could be achived through the difference between
> slipping and sticking friction.
>
> So in both cases you can get a movement of the parts in a predefined
> direction.

Sure, you definitely need asymetrical mechanical
movement.

 > In a transportation system you must be able to change the speed and
the
> movement direction
> of the moved parts (forward and backward like a conveyor) and this is IMHO
> only possible with
> unsymetrical electrical waveshapes.

Ok, but the picture of the device you posted only
works in one direction? Looking at the angle of
the vibratory movement it would only need to be
oscillated, and the moved parts would always travel
in the same direction. Are you saying it is suitable
for both directions?

> By the way I have build your current limited SMPS on my workbench with great
> success; more publications
> like this please :-).

Thanks! :o)
-Roman

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