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Chapter 7 Motion Control Functions
Please refer to the table below to know the differences between a machine cam (physical cam)
and an electronic cam (virtual cam).
Structure
Smooth
Performance
Position
Accuracy
Long Distance
Motion
If master axis
can be
eliminated
Replacement
Maintenance
Other
Revision January 2011
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Machine Cam (Physical Cam)
Return to the original position
after one rotation.
Determined by actual process
precision
The position accuracy is very
precise (under the condition of
no vibration)
When the motion distance is
longer, the system needs bigger
machine cam. Making a big
machine cam is not easy.
Master axis can not be
eliminated
Need of replacement or repair.
It will cost money.
Machine will wear. Maintenance
is necessary.
Mater axis will occupy the space
and consume the power.
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Electronic Cam
After E-Cam rotates 360 degrees (one
revolution), it can return to the original
position and also can display by spiral
form like mosquito coil incense.
Three curves can be interpolated
between two positions upon software.
The position accuracy is very precise,
but the actual motor position will be a
little deviated due to the delay time.
Only need to change the values of E-
Cam curve. It is applicable for the
application of long motion distance.
Master axis can be eliminated for
constant speed motion application.
Users can use the signals that
generated by the servo drive.
No need of replacement or repair. Users
only need to reset the parameter
settings.
Maintenance is not necessary.
Space and energy saving. Good for
environmental protection.
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