+1 vote
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1 Answer

+1 vote
answered Apr 27, 2015 by chad.trinh (605 points)
For constant speed applications, you may need a damped unbalance response.  The bearing stiffness and damping characteristics should be provided for 10, 50, and 100 percent of rated gear output at the operating speed.  Bearing characteristics should be provided for the range of expected bearing clearances.

For variable speed applications, you should have a damped unbalance response showing rotor vibration level versus speed from zero to maximum continuous speed.  The bearing stiffness and damping characteristics should be provided for the speed range zero to maximum continuous for power levels of 10, 50, and 100 percent of gear rated output.  Bearing characteristics should be provided for the range of expected bearing clearances.

For synchronous motor drives and variable frequency induction motor drives, the gear unit including the gear teeth and bearing metal should be rated to withstand the peak oscillatory torque values predicted by the system transient torsional analysis of the motor starting without incurring fatigue damage or failure.
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