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In order to get the maximum power possible out of the permanent magnet system it is
necessary to supply a cool air flowaround the drive coil. This air flow should be
0,42 m
3
/
min at 0,008 kg/cm
2
pressure. An ordinary vacuum cleaner will suffice
.
The
hole in the base of the PM Body is made to receive a vacuum cleaner nozzle. Note that
the vacuum cleaner should be used to suck air from the Shaker rather than blow
air
in.
The air blown from vacuum cleaners is generally
too
warm
for use as a
coolant.
It should also be noted that the base of the Body is
open.
Therefore
if the Shaker is used
in other than the upright position, for instance if it is sim
ply
laid on its side, it will be
necessary to fix a plate to the bottom in order to ensure an adequate cooling flow. If the
Shaker is suspended by using a plate fixed to the mounting holes in the bottom (see sec
tion 3 .7) then there is no problem
.
Fig. 2.7 is a bottom view of the 4805, showi ng the
placement of the mounting holes
.
~
121
±
0,2
~
83
±
0,3
8
x
11
mm
~
Air·holes
7404
12
Fig.2
.
7.
Boltom of the 4805
12
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