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Technical Information
Pump Description
Pump Description
The pump consists of a high frequency motor driving a turbine fitted
with 8 bladed stages and 4 Macrotorr stages. The turbine rotates in
an anticlockwise direction when viewed from the high vacuum flange
end. The turbine is made of high-strength aluminium alloy, machined
from a single block. Proceeding from the high vacuum to the for
vacuum region, the turbine stages sequence is:
The Macrotorr stages are in the form of four discs.
The turbine rotor is supported by permanently lubricated high
precision ceramic ball bearings installed on the forevacuum side of
the pump.
The static blades of the stator are made of stainless steel. These are
supported and accurately positioned by spacer rings.
The Macrotorr stators are in the form of self-positioning machined
discs with pumping channels and an opening restricted by the
corresponding rotor discs. These are made of aluminium alloy.
During normal operation, the motor is fed with a voltage of 54 Vac
three-phase at 646 Hz. To reduce losses during start-up to a
minimum, the frequency increases according to a ramp with a higher
initial voltage/frequency ratio.
The pump has to be air cooled and an external fan is available.
A thermistor sensor is mounted near the upper bearing to prevent
the pump from overheating.
The pump is balanced after assembly with a residual vibration
amplitude less than 0.01 μm.
210/248
1st stage with a blade angle of 40°,
2nd stage with a blade angle of 34°,
3rd stage with a blade angle of 28°,
4th and 5th stages with a blade angle of 24°,
6th stage with a blade angle of 20°,
7th and 8th stages with a blade angle of 16°.
TV 801 Navigator Bolted Flange User Manual / 87-900-980-01
(D)
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