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Anisotropic Magnet:
it is a magnet that
has a favourite
direction of
magnetic
orientation, so that
the magnetic
characteristics are
optimal in that
direction.
Coercive Force,
HC:
it is the force of
demagnetization,
measure in Oersted,
needed to reduce the
B induction to zero,
after the magnet has
been previously
taken to saturation.
Curie
Temperature:
it is the
temperature at which
the magnets are not
able to keep
magnetization
anymore.
Flux:
it is the condition
that exists in a
magnetized and
undergone to a force
piece. This is
characterised by the
fact that the
electromotive force
is produced in a
direction that
surrounds the flux
at every moment.
Flux unity: 1 Wb
(Weber) = 1 Vs (Volt
per second) = B (A =
surface).
Gauss, Gs:
it is the density
unity of magnetic
flux of the GSC
system, the magnetic
flux line per
aligned inch. The
induction unity is
Gauss in the GCS
system.
Hysteresis Curve:
it is a one sluice
curve obtained by a
material, tracing
and corresponding
the magnetic
induction value, B
(on the abscissa),
against the force
magnetization, H (on
the ordinate) = (B)max
Induction, B:
it is the magnetic
flux for a normal
sector of a normal
section to the flux
direction. The
induction unity is
Gauss in the GCS
system.
Intrinsic
Coercive Force, Hci:
it is an intrinsic
capacity of a
material to resist
the demagnetization.
Its value is
measured in Oersted
and it is
correspondent to
null intrinsic
induction of the
material after the
saturation. The
permanent magnets
with the high
intrinsic coercive
force are called
permanent magnets,
that usually are
associated with a
high stability of
temperature.
Irreversible
loss:
it is defined as a
magnet partial
demagnetization
caused by external
causes or other
reasons. These loss
can be recovered
only by
remagnetisation. The
magnet can be
stabilised to avoid
performance
variations caused by
irreversible losses.
Isotropic
Magnets:
it is material of a
magnet whose
magnetic properties
are the same in any
direction. They can
be therefore
magnetised in any
direction without
loss of magnetic
characteristics.
Magnetic Force:
it is the
magnetomotive force
for length of an
unity in any point
of a magnetic
circuit. Oersted
unity is the
magnetic force of
the GCS system.
Maximum Energy
Product, (BH) max:
there is a point in
the hysteresis loop
where the product
magnetizes the H
force and the B
induction reaching a
maximum. The maximum
value is called the
Maximum Energy
Product. This point
is the magnet
required value to
program an energy.
This parameter is
usually used to
describe how strong
this permanent
magnetic material
is. Its unity is
Gauss Oersted. One
MGOe means 1.000.000
Gauss Oersted.
Oersted, Oe:
it is an unity to
magnetize the force
in the GCS system.
One Oersted is equal
to 79.58 A/m in HE
system.
Remainder, Bd:
it is the magnetic
induction that
remains in a
magnetic circuit
after the removal of
an application,
magnetizing the
force. If there is
an aerial difference
in the circuit, the
remainder will be
lower than the
remaining induction,
Br.
Residual
Induction, Br:
it is the value of
the induction in a
point of the
hysteresis loop, to
whom the hysteresis
wrap crosses up, the
one of the B axis to
zero that magnetizes
the force. The Br is
the product of the
maximum magnetic
flux density of this
material without an
external magnetic
field.
Saturation:
it is a condition
for which the
induction of a
ferromagnetic
material has reached
its maximum value
with the applied
increase,
magnetizing the
force. All the
magnetic flux are
oriented in one
direction to the
state of saturation.
Stability:
it is the capacity
to resist a
demagnetization
during an operation.
This influence of
demagnetization can
be caused by high or
low temperatures or
by external magnetic
fields.
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