Reinoud: to show the very strong effect of a second magnet, if you place a
larger cube magnet just beneath the single moving magnet in yor coil, you
will instantly see anf hear and mostly feel the sudden increase in power
output in newtons or grams. I have considered using an Halbach array at the
bottom of the entire display rather than separate stationary Power Magnets
for each actuator, but at this point it would mess up the straightforward
interconnections which are so simple at this point, so why disturb them. If
I can figure another equally easy way to interconnect the actuators to keep
manufacturing simple as it now is, I would go with the Halbach array, but
for now it is individual Power Magnets for each actuator, and after all,
this does just fine as it is.
Notably, as one might expect, the Moving Magnet pushes upward away from the
like pole of the Power Magnet until it hits the stops. However, it takes no
more power to move the Moving Magnet downward than it does to move it
upward. This might seem counter-intuitive since it has to overcome the
repulsive force of the Power Magnet, but so it is. So, anything in the
waveform below the zero-line if the lower part is equal to the upper part of
the waveform is a waste of energy. So, the waveform might be a sawtooth
with most of its duty cycle above this zero-line, and only a portion below
the line. It does save a lot of energy. The more, the better.
Charles
-----Original Message-----
From: Marie-Aline Oliver
Sent: Tuesday, May 19, 2015 6:33 AM
To: optacon-l@xxxxxxxxxxxxx
Subject: [optacon-l] Re: Reinoud, how many coils and their relationship to
the permanent magnet?
Very impressive Charles and Reinoud. Keep up the great work gentlemen!
--MAO
On 18-May-15, at 8:58 pm, C. Pond wrote:
Thanks, Reinoud. The function of the second stationary magnet
positioned
below the moving magnet is to act as a kind of flux booster. It
adds flux
density and intensity to the entire magnetic circuit, like a big
second
battery adding power to a motor already connected to a first smaller
battery. The combination of the two coils, the moving magnet and this
stationary "power magnet" completely saturates the flux gap, so
adding more
magnetism does nothing more. Adding this second magnet gave the
tactuator
such a lot more power that it was shocking; like day and night. So,
between
the two coils resonating and moving the "moving magnet" and the "power
magnet", the force generated by the actuator is very high. It can
generate
more force than the R2 optacon's entire 100-pin bimorph-based
display. and
each actuator is in overdrive when using 200mV. The impedance of each
actuator I haven't measured or calculated; their static resistance is
meaningless, but it is about 1.6 to 2 ohms. I think the
electromagnetic
oscillating field does not move the moving magnet; it moves the
flux, which
in turn moves whatever is in the flux field. Like waves of water in
turn
moving a boat afloat upon the watery waves. The boat does not move
itself;
the waves of water move the boat.
Charles
-----Original Message-----
From: reinoud
Sent: Monday, May 18, 2015 6:33 PM
To: optacon-l@xxxxxxxxxxxxx
Subject: [optacon-l] Re: Reinoud, how many coils and their
relationship to
the permanent magnet?
