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BRUEL & KJAER System V - St Ray Magnetic Field

BRUEL & KJAER System V
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its
axis
but
is
prevented
from
moving
sideways
or
rotating
in
any
direction.
The
inner
ends
of
the
radial
flexures
are
attached
to
the
moving
element
skeleton
. The
outer
ends
of
the
radial
flexures
are
mounted
in
pairs
to
flexure
mounting
blocks.
The
flexure
mount-
ing
blocks
are
mounted
on
the
tangential
flexures
.
The
tangential
flexures
are
mounted
on
the
frame
.
As
the
moving
element
moves
up
or
down,
the
eight
radial
flexures
bend
as a
double
cantilever
beam
.
The
outer
ends
of
the
radial
flexures,
the
flexure
mounting
blocks,
and
the
tangential
flexures
all
move
inward
as
the
moving
element
moves
either
upward
or
downward,
and
therefore
vibrate
at
twice
the
frequency
of
the
table
motion
.
A side
force
applied
to
the
top
of
the
table
normal
to
the
main
axis
tends
to
deflect
the
radial
flexures
as
beams,
but
little
deformation
results
since
the
beams
are
very
stiff
in
this
direction.
Motion
of
the
outer
ends
of
the
radial
flexures
is
resisted
by
the
high
tor
-
sional
stiffness
and
high
lengthwise
stiffness
of
the
tangential
flexures.
Each
flexure
is a
sandwich
of
metal
and
rubber
bonded
together
.
The
design
is
such
that
a
very
high
degree
of
damping
is
provided
for
the
resonant
modes
of
the
flexure
.
6,1,3,
Stray
Magnetic
Field
Magnetic
shields
are
provided
to
reduce
the
flux
density
above
the
table
top
. In
Figs.6.4
and
6.5
are
shown
plots
of
typical
steady
state
flux
density
as a
function
of
distance
above
the
table
top
.
The
alternating
flux
density
is
negligible
.
Gauss
9
8
6
5
4
3
2
!\
\T
yp
e48
11
~
~\
~
~
~
~
r--...
~
~"
~~
r=:;:
r----::::-
t--
-I-----
10
20
30
40
50
mm
Oistance above table mounting surface
o 0,5 1,0 1,5 2,0
I~----------~I------------~I------------~I------------~I
7401 05
Fig. 6. 4.
Magnetic
flux
density
above table top. Types
48",
4812,
4813
with
Type
4801
Body
35

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