Rockwell Automation Motion Analyzer Software - Manual (Page 83)

Rockwell Automation Publication MOTION-UM004B-EN-P - October 2012 83
Sizing Your System Chapter 2
2.1.1. Linear Loads
For a Linear application, the load moves in a straight line.
Figure 66 - Linear Load Type
Table 49 - Linear Load Parameters
Parameter Description
Load Mass Mass of the linear load.
Applied Force
Any external force (+/-) acting on the load. Positive force acts to oppose positive
movement; down the inclination surface if inclination is non-zero. The arrow on the
graphic indicates the force direction.
Coeff of Friction
Coefficient of friction (μ). It is a unitless value, which is used to calculate the force of
friction. It is largely dependent on the nature of the surfaces in contact with each other.
Typical values for the coefficient of friction can be found in engineering tables. This value,
along with the load mass (for example, Load weight + Table/Slide/Carriage weight),
determines the amount of motor force or torque necessary to move a slide or table, for
example.
Inclination
Angle of inclination from the horizontal. The limits for this value are 0 and 90°. In the
horizontal case (0° inclination), the Table Mass, Belt/Chain Mass, and/or Slide Mass are
not affected by gravity, whereas in the vertical case (90° inclination), only the table mass
is affected by gravity. Values for Table Mass, Belt/Chain Mass, and/or Slide Mass may be
entered on the Mechanism tab (a future step in the workflow) if a Belt Drive, Lead Screw,
Chain and Sprocket, or Rack and Pinion are selected.
If the Inclination angle is between 0 and -90°, you must enter the angle as a positive
number and invert the motion profile. For example, enter a 45° angle value on the Load
tab and a negative velocity in
More Options Profile Editor Mode on page 142 . Failure to do
this will result in an under-calculation of the regenerative energy.