Innovative Approaches for Optimising Tension Control

Klaus Feldmann & Andreas Dobroschke

Demands on the quality of winding products have continuously increased during the recent years. In order to produce high-quality coils with the required electrical properties manufacturers are forced to optimise the winding process. One of the most important factors influencing the quality of a coil is the tensile force, which has to be kept within tight tolerances. Especially processing wire diameters below 20 µm the tensioners usual in trade are unsatisfying as they do not have a closed control loop. But there are certain stages of the process that require a change of the desired value.

For the innovative prototypes of tensioners different actuators are used adapted to the manufactures’ requirements. For changing the desired value during the winding process a cheap stepper motor with rather low dynamic is sufficient. In contrast for keeping the tensile force constant while bobbins with a rectangle cross section are processed high dynamic actuators are necessary. Here a piezomotor is an appropriate compromise between dynamic and operator convenience.

In this paper different solutions for both – optimising the course of the tensile force during the process and changing the desired value – are presented. Keeping the tensile force within restricted tolerances is an important contribution to facilitate a perfect layer winding and to reduce the mechanical stress of the wire.

Dipl.-Ing. Andreas Dobroschke

Lehrstuhl für Fertigungsautomatisierung und Produktionssystematik

Friedrich-Alexander-Universität Erlangen-Nürnberg

Egerlandstr. 7-9

91058 Erlangen

Tel.: +49 9131 85 - 2 79 62

Fax: +49 9131 30 25 28

mailto:dobroschke@faps.uni-erlangen.de

http://www.faps.uni-erlangen.de <http://www.faps.uni-erlangen.de/>