hi my name is Jose Luis Jimenez and
today I'll be demonstrating the basic
principles of how magnetic levitator
works so similar materials we use were
an electromagnet an Arduino a permanent
magnet and the most important thing the
linear Hall effect sensor some of the
basic principle of how electromagnet
works is that an electromagnet I made by
applying a current through a conductor
this creates a magnetic field and this
magnetic field can increase by adding
more turns to the coil or just adding a
bolt. These devices are used
on motor generators and many other
electromechanical systems so some of the
basic principles of how a Hall effect
sensor work is that these type of
sensors are used to measure magnetic
field intensity and the output of this
device is the voltage that is
proportional to the applied magnetic
field so today we're going to be looking
at an application of this type of sensor
with magnetic levitation so the whole
effect principles were discovered by
American physicist Edwin Hall in 1879 he
found out when a moving current passes through a
conductor and a magnetic field is
introduced perpendicular to the current
the electrons flowing on the conductor
began to begin to deflect
due to the Lorentz force this is a
result places on the negative and
positive charges opposite to one another
on the plate this basic principle is
what generates the output voltage that
is known as the hall voltage so to
figure out this hall voltage would use
the Lorentz force when the charge is
being deflected by the magnetic field
reaches a steady-state so better arrange
force is zero and we can solve for the
electric field this electric field is
just the negative drift speed times the
magnetic flux in the same direction
so
you find this hall voltage we use the
electric field we just arrived in an
equation from the notes on page 2 point
37 integrating this value we get that
the whole voltage is equal to the
negative drift speed times the magnetic
flux in the Z direction types of length
so now to solve for these tip speed we
use an equation on page 2.48 from the
notes and so we get that the whole
voltage produced is directly related to
the magnetic flux that is why this
voltage can vary depending on how far
the magnet is to the sensor now that we
know how an electromagnet and a whole
effect sensor work let's look at the
basic principle of how an
electromagnetic levitation works this
works by having the electromagnet
attract the permanent magnet and when
the magnet is close enough the hall
effect sensor detects it and turns its
solenoid off so the magnet falls back down
and when this magnet is very low the
sensor doesn't detect it anymore
and turns a collar back on which
attracts the magnet again on this
happens so fast and we see magnetic
levitation all right so let's see it in
action we weren't exactly able to make
it let me tell you we tried many
different electromagnets Hall sensors
and different codes but it just wouldn't
work for us however we did get it to
balance real nice so we'll see that
 
