Publicité
17
Technical Information
Pump Used in Presence of Magnetic Fields
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Figure 42
Pump Used in Presence of Magnetic Fields
Magnetic fields induce eddy currents in the rotor of a turbomolecular
pump that tend to oppose to its rotation.
The result is increased electrical power consumption by the motor,
most of which is dissipated in the rotor.
Since the rotor is not in contact with the stator the above power can
leave the rotor mainly by radiation and hence the rotor may be
overheated while static parts of the pump remain cool.
This effect is strongly dependant from the intensity, time function
and distribution of the magnetic field.
In general, therefore, an increase in pump power can be expected.
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Purge gas line
Pressure regulator
Gas purge valve
Gas purge port
Forevacuum pump
TV 401/301 MS pump
Purge layout
TV 401/301 MS User Manual / 87-901-013-01
(A)
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