6.3.3.
Other
Features
Specific
to
the
Type
4815
The
construction
of
the
Type
4815
is
sim
ilar
to
that
of
the
Type
4814
in
that
the
force
produced
in
the
Driver
Coil is
directed
to
a
single
mounting
point
in
the
center,
the
upper
radial
flexure
is
one
piece
and
the
Driver
Coil is
formed
of
aluminum
wire.
However,
the
total
peak-to-peak
travel
is
only
12,7
mm
(0,5
in).
Magnetic
shields
are
provided
to
reduce
the
flux
density
above
the
table
top
.
Figs.6.14
and
6.15
are
plots
of
typical
steady
state
flux
density
as a
function
of
distance
above
the
table
top.
The
alternating
flux
density
is
negligible.
Gauss
30
40 50
mm
Distance above Reference Accelerometer
o 0,5
1,0
1,5
2,0
inches
I
!
I
740109
Fig
.
6.
14.
Magnetic
flux
den
sit
y
above
the
reference
A
ccelerometer.
Type
4801
Body
Gauss
8or---------,----------r---------,----------.---------~
70
r-
----
----~~~~---r--------~----------+---------~
60r---------~---------r--------~~~~~--
+-
--------~
500~--------~10----------2
L
O--------~30----------4~0--------~50
mm
Distance above Reference Accelerometer
o 0,5 1,0 1,5 2,0
inches
IL-
__________
-L!
____________
~I
____________
~!
____________
~I
740110
Fig.6.
15
.
Magnetic
flux
density
above
the
reference
Accelerometer.
Type
4805
Body
42
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