Bearing size selection
The bearings size should be as small possible, partly to reduce loss
but most importantly to reduce torque loss at startup and low tsr. The
upper bearing will only take radial load, while the lower bearing will
take both axial and radial load. The highest load is the radial load acting
on upper bearing.
The maximum radial load is much lower than the allowable static load
rating. At static condition when rotor not rotating, only axial load (rotor
weight) is acting on lower bearing. This axial load of .009kN is small
compare to the recommended allowable load of 25% of static load rating.
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