Extrusion International 2-2021

38 Extrusion International 2/2021 DRIVE TECHNOLOGY duty timing belt. Substantially higher overall efficiency is the result. This makes it possible to use lower-out- put motors with reduced operating costs, leading to several intrinsic ad- vantages: • Optimization of drive performance with a motor-driven application and in a single system or department, in the entire plant or company, in one industry, nationally and internation- ally; • Standardization of new services, products, and business models re- lated to the IoT trend “networking and digital transformation in drive technology”. The advantages of the overall drive system are the same as for all modularization efforts. • For machine developers: lower de- velopment costs, economies of scale in production, multiple series of the same type, and consistent and there- fore simpler assembly processes. • For machine operators: the ability to exchange single faulty modules makes repairs fast and economical. Compatibility and reuse of compo- nents minimizes spare-part stocking expenses. • Consistent modularity greatly in- creases clarity and acceptance both on the manufacturer (sales, assem- bly, startup, spare parts service) and user (purchasing, operation, mainte- nance) sides. What rolewill classical mechanics and electronics play in the digital era? Networking and digital transforma- tion, combined with business models based on new service opportunities are very important for any national economy. But solutions designed to boost sustainability of resources, energy efficiency, or the recycling economy will continue to grow in sig- nificance. Accordingly, mechanics as well as electrical, drive, and mobility technology will remain the heart of industrial production. Author: Juan Carlos González Villar, Owner Kabel.Consult.Ing Kabel.Consult.Ing Reststrauch 55, 41199 Mönchengladbach, Germany www.kabelconsulting.de therefore minimization of energy costs; • Optimization of generator output with a generator-driven application and therefore maximization of en- ergy output; • Standardization of the drive com- ponents on an individual machine, poor suboptimum optimum poor suboptimum optimum highest ef fi ciency fi eld 75%-15% 75%+15% Ef fi ciency 100% highest ef fi ciency fi eld A++ A+++ A A+ μ (n) = 0,9 x nominal speed μ (n) = 0,75 x nominal speed μ (n) = 0,6 x nominal speed μ (rpm) 25% 60% 90%100% Load Typical characteristic curve from the cable industry (Source: Kabel.Consult.Ing) Applicationwith „constant torque drive“ and 1Motor / 1 Gear unit / 1 Controller installed power (kW) net power requirement (kW) Torque [Nm] Rotation (rpm) Motor T max [rpm] max. break forth torque of motor torque characteristic of extruder f (rpm, friction, shear strength etc.) f (n, Tmax) f (n, T[66%] f (n, T[33%] Motor n max [rpm] Ef fi ciency curve of a motor (Source: Kabel.Consult.Ing)