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BRUEL & KJAER System V - M Echanical Over-Trave I Stops; Split Hub; Driver Coil

BRUEL & KJAER System V
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-----
----
---
Gau
ss
90
80
~
1
1
r------
70
-----
==--------=.,
60
50
~
40
-
Type
4813
30
E
20
O 10
20
30
40
50
mm
740106
Distance
ab
ove table
mounting
s
urface
O 0,5 1,0 1,5
2,0
in
ches
~!
----------~!--
----------~!----------~!~--------~!
Fig. 6. 5.
Magnetic
flux
density
above
table
top. Types
48"
.
4812.
4813
with
Type
4805
Body
6.1.4.
Mechanical
Over-travel
Stops
Over-travel
stops
are
provided
on
the
upper
and
lower
surfaces
of
the
magnetic
shields.
These
stops
permit
a
total
peak-
to-peak
travel
of
at
least
12,7
mm
(0,5
in).
The
over-travel
stops are
intended
for
emergency
use
only
. The
stops
are
designed
to
ab-
sorb
the
energy
of
an
occasional
high
velocity
impact.
Neither
the
moving
element
nor
the
resilient
pads
are
designed
for
frequent
impacts
,
and
such
impacts
should
be
avoided
since
forces
of
thousands
of
newtons
and
decelerations
of
many
thousands
of
g
can be
generated,
possibly
caus
ing
damage
to
both
the
Exciter Head
and
to
the
speci-
men
.
6.1.5.
Split
Hub
The
split
hub
is
made
up
of
four
identical
pieces,
each
machined
from
a
pure
iron
cast-
ing.
The
upper
part
of
each
piece
is a
segment
of
a
circle
Iying
in a
similar
plane
to
the
table
itself.
The
lower
part
approximates
a
tapered
quarter
cylinder
and
is
concentric
with
the
vertical
axis
of
the
Shaker
Base.
The
split
hub
has
a
dual
purpose.
It is a
part
of
the
upper
magnetic
circuit
of
the
field
and
is made a
part
of
the
,
Exciter
Head
to
provide
an
opening
into
the
center
of
the
magnetic
assembly
through
which
the
driver
coil can be
inserted
as
the
Exciter Head is
mounted
.
The
lower
part
of
the
split
hub
is
machined
to
a
fine
tolerance
fit
to
the
center
post.
This
provides
a
concentricity
guide
during
mounting,
preventing
the
driver
coil
from
rubbing
as
It is slid
over
the
centre
post
into
the
air
gap
. It
also
ensures
the
correct
positioning
of
the
driver
coil
in
the
air
gap
during
operation.
6.1.6.
Driver
Coil
The
Driver
Coil is
formed
as a
double
layer
of
rectangular.
high
purity
wire.
one
layer
wound
on
the
outside
of
the
cylindrical
part
of
the
skeleton
and
one
wound
on
the
inside.
The
wire
used
for
the
Types
4812
and
4813
is copper.
while
that
used in
the
Type
4811
36

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