| The Di Pietro Motor
(Rotary Air Engine) |
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The
Di Pietro motor concept is based on a rotary piston. Different
from existing rotary engines, the Di Pietro motor uses a simple
cylindrical rotary piston (shaft driver) which rolls, without
any friction, inside the cylindrical stator. The space between
stator and rotor is divided in 6 expansion chambers by pivoting
dividers. These dividers follow the motion of the shaft driver
as it rolls around the stator wall. The motor shown is effectively
a 6 cylinder expansion motor.
The
cylindrical shaft driver, forced by the air pressure on its
outer wall, moves eccentrically, thereby driving the motor
shaft by means of two rolling elements (not shown) mounted
on bearings on the shaft. The rolling motion of the shaft
driver inside the stator is cushioned by a thin air film.
Timing and duration of the air inlet and exhaust is governed
by a slotted timer which is mounted on the output shaft and
rotates with the same speed as the motor.
Variation
of performance parameters of the motor is easily achieved
by varying the time during which the air is allowed to enter
the chamber: A longer air inlet period allows more air to
flow into the chamber and therefore results in more torque.
A shorter inlet period will limit the air supply and allows
the air in the chamber to perform expansion work at a much
higher efficiency. In this way compressed air (energy) consumption
can be exchanged for higher torque and power output depending
on the requirements of the application.
Motor
speed and torque are simply controlled by throttling the amount
or pressure of air into the motor. The Di Pietro motor gives
instant torque at zero RPM and can be precisely controlled
to give soft start and acceleration control.
Angelo
Di Pietro Director of R & D said:
"There
is no other motor as good as ours, years of research and analysing
other motors around the world gave me the confidence and obligation
to say so. Obligation in the sense that people have been waiting
for ages in relation to efficiency in order to take care of
our environmental situation.
100%
more efficiency than our competitor is a very serious claim
and should not be confused with some kind of publicity stunt
were the interest is purely to try and make money out of some
ridiculous claim.
The
invention has a long list of important improvements over other
motors.
The
concept has the capability to change the method we use for
transportation, apart from the benefits of energy saving in
stationary applications.
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