> > 2. A directed movement of a part for transportation purposes could only
be
> > achived with a unsymetrical waveshape.

>I don't think this is true. There are *many*
>mechanisms where transportation will work well
>with an equal waveshape;

>* when the back/forth movement has a vertical
>component, as shown by the 20 degree angle of
>the device in your picture.

>* when the friction surface has a uneven friction
>system, like the angled plastic "carpet" fibres
>shown on the web page for that commercial system.
>Horizontal vibration is all that is required.
>-Roman

--
Hello Roman,

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.
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.

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. Of course you can additionaly change the
frequency.

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

-- Thomas

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