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accordance with signals from three Hall-effect devices mounted at 120
degrees around the motor.
The IC also limits the motor current on
start up and produces dynamic braking to stop the motor quickly.
contaminants are kept out of the drive by mounting the motor inside a
heavy aluminum housing, bolted to the base casting.
Two conductive
ferro-fluid magnetic seals prevent outside air from entering the drive
through the bearing core or along the bearing shaft.
Motor components
are processed and coated to eliminate dust, chips, and oxides, and
final assembly is in a Class 100 clean room environment.
EMI (Elec-
tromagnetic Interference) and electrostatic discharge (ESD) are
reduced by grounding the rotating shaft with a brush of conductive
teflon.
2.1.7
Air Filtration
The Q250 and Q280 are Winchester drives with a nominal flying height
of 11 microinches .
. 3 MICRON CIRCULATION
FILTER
Figure 2-2: Inside View of Drive, Showing Air Filtration
2-3
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