Electronic cam


In the past, mechanical cam disks were always used for harmonizing complex movement sequences in cyclical machinery.

With this method, a centrally driven shaft, the bevel-gear shaft, ensured synchronous operation of all cam disks. The speed
of this bevel-gear shaft could determine the production speed of the machine. However, this mechanical solution is very inflexible
and can no longer cope with the requirements of modern production and processing machines.

As a result, mechanical cam discs in system and mechanical engineering are increasingly being replaced by electronically controlled
drives called electronic cams.

Electronic cam applications can be found in the following sectors:

  • Packaging industry

  • Timber industry

  • Materials handling

  • Handling technology

  • Printing machine technology

The figure displays a typical example of electronic cam application. Freshly filled yogurt pots at the end of a conveyor belt
are transferred to an adjacent conveyor belt for further processing. The tines of the rake are inserted between the yogurt
pots, lifting and transferring them. The electronic cam can be used to realize a motion sequence ensuring that the pots are
lifted smoothly.

The solution for the drive application with MOVIDRIVE® is based on a special software that is integrated into the “MOVIDRIVE® drive inverter with electronic cam” unit series. The entire motion sequence is controlled in the inverter. External control
is not required for the electronic cam.
A user-friendly cam editor will support you during startup. Using a movement plan, you define the curve profile of the slave
drive based on various movement types. You also have the option of importing existing cam data. You can use a physical drive
or a virtual master encoder as the master drive. You can also set application-specific parameters for the engagement and disengagement
phases of the slave drive using the cam editor. For example, the slave drive can be engaged as either event-driven or position-based.
Disengaging can also be event-driven or can occur after a predefined number of cycles.

After you have created the curve, you can represent the three derivations speed, acceleration, and jerkiness. You can thus
use your PC to optimize the curve profile for smooth running.

The curve editor generates the curve point table based on the curve profile. This curve point table is the basis for the dependence
of master and slave drives. You can also import an existing curve profile in the form of a curve point table.

A significant feature of the MOVIDRIVE® drive inverters that comes into play with the electronic cam is the integrated IPOSplus® positioning and sequence control system. An IPOSplus® program in MOVIDRIVE® controls the entire motion sequence in MOVIDRIVE® as machine-oriented as possible. In addition, further system-specific functions can be controlled with this IPOSplus® program.

  • Wide range of functions

  • High system flexibility

  • User-friendly electronic cam editor

  • Import option for curve data

  • Optimization of smooth running, maximum acceleration and oscillation tilt

  • Monitor mode for optimum diagnostics

  • Virtual encoder can be used as the master encoder

  • Either terminal control or fieldbus control

  • Units can be linked with the existing standard system bus

  • All movement control is carried out by the IPOSplus® program in MOVIDRIVE®
  • Decentralized concepts can be implemented more easily

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