Winding on non-circular cylindrical, near elliptical bodies creates web length changes between the material support point and the deflector roller. These were previously compensated mechanically or by a variable winding speed. The new Siemens Motion Control solution for prismatic winding calculates cyclically in advance the support points of the material on the deflector roller and winding body, and feeds these into the controller. The machine constructor benefits from higher winding quality, higher machine speed and process reliability.
The new self-learning LECo application replaces the previous dynamic position controllers. These correct position errors of the process axes caused, for example, by a mechanical shock, but only after a delay. By continuously monitoring the process axes, the new Siemens solution quickly detects deviations, calculates the pre-control value on the basis of the following error, and feeds this into the controller in the next cycle. Deviations are already largely compensated for after the first cycle. In the following cycles, a learning algorithm continuously monitors the result of the compensation, fine tunes the drive control, and thus also increases the process accuracy.
Further information about converting can be found at www.siemens.com/converting