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A servomotor example application

01 January 2009

In this example unwind, process, and rewind operation, the two winding drives at the ends are powered with three-phase asynchronous motors driven by frequency inverters.

(This is an illustration for the article Servo Motors: The Muscle for Automation Tasks. To link to the main article see below.)

The six servo drives in between are networked with the inverters and interact with them.

On the one hand they are connected by the DC-bus so that they can interchange electrical energy. This reduces the total power consumption of the machine, because some drives, when they are decelerating, act in regenerative mode, generating power to the machine.

The speed for the winding drive is coupled by an electronic shaft to the servo drives, so the winding drive provides the master speed and angle information and all other drives synchronise their speed and angle to the master.

Take, for example, the servo motors on top, used for the linear motion such as painting, gluing or cutting the film. Their linear motion is synchronised to the moving film (they are, after all, ‘shooting at a moving target’).

This synchronisation is made by the special function called ‘flying saw’ inside the servo drives.

In an similar manner the servo drive with the slotter cylinder synchronises its speed to the film, so that the slots are cut precisely into the film. This synchronisation is made by the special function ‘cross cutter’ which is also a part of the servo drive’s software.

—Dr.-Ing. Carsten Fräger, Team Leader Portfolio Roadmap Management, Servo Drives & Motors, Lenze Hameln.


For the main article, “Servo Motors: The Muscle for Automation Tasks” CLICK HERE


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