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Rockwell Automation Publication 2198-UM004A-EN-P - October 2019
351
Motion Control Applications
Chapter 12
E-Cam Curve
The electronic cam curve is a function between the position of the master axis
and the slave axis. The electronic cam is built in a variety of ways and can be built
using other mathematical software tools. Several commonly used construction
methods are also provided in KNX5100C software. Regardless of the tool
construction method, the equation is eventually converted into position points
stored in the data array. A single electronic cam curve can have up to 721 data
(720 segments), meaning that the highest resolution is 0.5 degrees. Multiple sets
of E-Cam curves can be stored at the same time, as long as the total number of
points does not exceed the upper limit of the data array (800). The slave axis
curve between the two data points is interpolated with a cubic curve to smooth
the motion at the endpoint.
Take Figure 176 as an example, if a mechanical cam is to be replaced by an
electronic cam, the mechanical cam must be divided into several equal parts. The
greater the division, the higher the accuracy. This example divides it into 8 equal
parts. Each part is separated by 45 degrees (this is an example, the actual
application must be fine-cut, otherwise the path will be seriously distorted), and
each distance between cam shaft and edge is filled into the data array. The
starting point of 0 degrees and the last point of 360 degrees is the same point, but
all must be filled in the data array to complete the mechanical cam curve in one
cycle. Therefore, a total of 9 pieces of data must be filled in to create the table of
the electronic cam curve.
Figure 176 - E-Cam Curve Table Creation
You can use KNX5100C software to create electronic cam curves. Click on the
E-Cam in the software toolbar to open the electronic cam editing window,
shown in Figure 177 .
The first page of the edit window lets you choose the approach to create the E-
Cam table. Currently, there are seven methods, including: manual, speed fitting,
cubic curve, automatic rotary shear, automatic rotary shear with fixed sync zone,
automatic rotary shear with adjustable sync zone, and automatic rotary shear with
intermittent printing machine.