Rockwell Automation Y-Series Brushless Servo Motor - Manual (Page 14)

14 Y-Series Motor Installation Instructions
Publication 1398-IN518A-EN-P — January 2001
Motor Load Force Ratings
Motors are capable of operating with sustained maximum radial or
maximum axial shaft loads. The measurement points for maximum
radial and axial load forces are shown in the figure below.
Figure 2
Load Forces on Shaft
The following table represents load factors that provide a 20,000
hour L10 bearing fatigue life for Y-Series motors. These load factors
do not account for possible application-specific life reduction factors
that may occur, such as bearing grease contamination from external
sources.
Axial load force (F)
AF
Radial load force (FR)
Radial load force (FR) applied to shaft at 2AF/3.