About one out of every two geared motors newly commissioned by the Indian steel industry in the last yearhas come from the Indian operation of German drive technology leader NORD DRIVESYSTEMS.
Pune , 2014-09-12
Roller table drives are a case in point for highly available, heavy-duty systems featuring superior resilience –they must withstand a harsh environment with high ambient temperatures, heavy shocks and vibrations andheavy loads, and have to provide stalling capability. Gears in these applications require an especially robusthousing material that accomplishes vibration absorption, typically, EN-GJL-200 (GG20) or EN-GJS-400-15(GGG40). Configuration options include reinforced shafts e.g. made from 42CrMo4, special coatings,synthetic lubricants, and special Labyrinth seal designs. Roller table motors must deliver high starting andbreaking torques, run at variable speeds, and be capable of instantly reversing direction. Frequentacceleration and deceleration is the rule; operating modes in these applications vary greatly, with S1, S5,and S9 duty most frequently required. Every roller table motor’s load torque must be high enough to reliablyhandle overload, i.e. cover for a neighboring drive system in case that unit should fail. These motors willusually be either ring-fin or straight-fin totally enclosed non-ventilated (TENV) types, which NORDmanufactures from high-strength cast iron that ensures maximum shock resistance. Featuring a largeramount of material as well as larger bearings and shafts, these systems withstand greater loads and have alonger service life than conventional industrial motors in the same performance range. However, NORD alsoprovides alternative motor solutions featuring various modes of ventilation. Ancillary components such asbrakes or incremental or absolute encoders can be supplied as well.While most areas in steel plants are hot and dry, with temperatures reaching 60 °C or more, there are alsosome like descalers, rolling stands, and sections such as cooling lines where conveyor drives mustadditionally provide IP66 ingress protection against spray water. Steam can pose a considerable corrosionthreat as well. ISO F insulation will suffice for drives in many cases, but class H motors must also beavailable on request to address particularly demanding conditions. NORD’s extensive range of dedicateddrive products and proven metals sector know-how ensure that steel industry OEMs, EPC contractors andend users always have the full range of options at their disposal.