14-12-2012, 02:57 PM
SPECIAL PURPOSE MACHINES
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ABSTRACT:
Day by day the interest on
special machines increases. Because
these machines serves for several
applications.For instance,the nano
generator could drive biological sensors
by making use of wind energy or water
flow,eliminating the need for external
batteries.This not only reduces the
device cost but also at the same time
reduces the entire equipment size.
Integrated starter generator
which is used in electric vehicles acts as
a bidirectional energy converter as a
motor when powered by the battery or a
generator when driven by the
engine.Linear motors are used to propel
high speed MagLev trains.Micro motors
plays an important role in computer hard
drives,optics,sensors and actuators.A
special type of outer rotor motors used to
drive the polygonal rotating mirrors
which are mounted directly on the rotor
in laser printers.
Nano generator
Researchers have
demonstrated a prototype nanometerscale
generator that produces continuous
direct-current electricity by harvesting
mechanical energy from such
environmental sources as ultrasonic
waves, mechanical vibration or blood
flow. The nanogenerators take advantage
of the unique coupled piezoelectric and
semiconducting properties of zinc oxide
nanostructures, which produce small
electrical charges.
MagLevTraction Motors:
The principle of
the linear induction motor is used to
propel high speed Maglev (Magnetic
Levitation) trains which float on a
magnetic field created by electromagnets
in the trackbed under the train . A
separate set of trackside guidance
magnets is used to control the lateral
position of the train relative to the track.
Thus the maglev train uses
electromagnetic forces for three different
tasks, to suspend, to guide and to propel
the train.
Conclusion:
All these special machines
plays a key role in their respective
fields.These machines reduces the time
of operation of the system and at the
same time provides smooth
operation.The researchers of nano
generator said, “You could envision
having these nanogenerators in your
shoes to produce electricity as you walk.
This could be beneficial to soldiers in
the field, who now depend on batteries
to power their electrical equipment. As
long as the soldiers were moving, they
could generate electricity.”This
statement indicates the importance of the
special machines.