Coventry/UK (Andantex) – High-speed coil winding requires the use of a tensioner between the feed coil and the receiving coil (end product). Fine control and the trend towards using larger-diameter wires to meet the high demand for electrical equipment such as transformers means that tension control solutions are required which offer high torque density as well as easy torque control. Altic, inventor of the modern tensioner and a benchmark for the sector, has selected EMP electromagnetic brakes from Merobel for its entire electrical and electronic range. Today’s high-throughput production machines routinely attain speeds of more than 30m/s for wires that are only a few hundredths of a millimetre in diameter. The forces applied to these wires are of the order of a few tenths of a newton, and must be controlled very precisely. The task is rendered even more complicated by the fact that the tension to be applied must be above the elastic limit of the wire (to give it rigidity) yet below its breaking point (to avoid any break leading to production shutdown).

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