n TECHNOLOGY Safety Eng gineering Solution Auto ns omation and Contro ol Fiel sa Yo afety our t y pa trus artne sted er www.euchn 14 +44 (0)1 sales@euc ner.co.uk 2560123 cher.co.uk STOBER IS OFFERING A drive-based technology for winding applications that enables smooth winding, unwinding and rewinding using tensile force control. The technology, based on the company’s SD6, SC6 and SI6 series, uses single- and double-axis controllers to determine position, velocity and torque/force controls. When processing plastics, paper, textiles and sheet metals, it is necessary to unwind, wind or rewind continuous webs with a defined tension. A winder usually consists of a drive, a material web and a series of sensors. To prevent the material from tearing or jamming, constant tension is necessary. The diameter of the roll changes during winding or unwinding, so diameter is a key to the operation of centre winders, where the central shaft of the winder is driven. These winders are complex to design. For example, to achieve good tension control, a centre winder requires friction and acceleration compensation and the drive controller needs good torque and current control. In addition, mechanical losses need to be kept as low as possible, using a suitable motor and an efficient gearbox with low friction losses. To keep the web tension constant, either a sensor must measure the winding diameter, or the tension must be calculated using multiple system variables, and the speed of the motor controlled accordingly. The velocity of the material web and the speed of the winder axis are key factors. Stober’s centre winder technology can be used to implement indirect tension control, thus eliminating the need for costly extra measuring systems. The material’s tensile force is based on the process parameter configuration. The motor is operated with a set torque, calculated from the tensile force and winding diameter. The torque limit can be adjusted accordingly and adapted as a function of the changing winding diameter, or the fixed roller diameter of the tension control axis. As well as delivering potential cost-savings, the application allows real-time process monitoring. www.stoeber.de/en Drive-based web control technology eliminates need for extra sensors Drive-based control of web machinery can result in smooth winding, unwinding and rewinding without needing extra measuring systems
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