Improve the accuracy of the speed control of the Koepe friction winder. The resolution of the existing inductive gear wheel scanning solution no longer meets customer requirements, so that a new sensor system is needed. The Koepe principle sees a Koepe wheel rotate around a fixed axle. Consequently, the magnetic scale of the speed measuring sensor cannot be attached to a rotating shaft as would be the case with a drum winding engine. The task was made even more difficult by the fact that the Koepe wheel runs out of true (eccentricity) by several millimeters, which is something the measuring system must compensate.
Koepe friction winder
An encoder system was developed to meet the exact requirements of the application. This consists of a pulse wheel with a diameter of 1300 mm and magnetic scale. The pulse wheel has a split design consisting of two halves to considerably simplify its installation. Both pulse wheel halves are precisely bolted to an equally split adapter ring, which is fastened to the Koepe wheel. The sensors are well-protected in a scanning head, which is fastened to a fixed part of the Koepe friction winder. Optimized at the maximum gap between the pulse wheel and scanning head the measuring system supplies 2460 square pulses per revolution.