Posted to News on 5th Jan 2011, 11:44
Motors and drives for metal processing machinery
For reversing rolling mills and similar harsh environment applications where high duty cycles and frequent reversals are encountered, Nord can supply a range of IC410 TENV motors with straight fins and radial fin or ring fin cast iron housings that improve the natural heat convection from the motor (and also help to resist steel production debris build up when the motor is installed horizontally). The radial fin motor range is available in power ratings up to 30kW and features special windings with reduced power but very high starting torques. The kW range adequately covers the power requirements for applications near the rolling mill stand where geared motors are used for the working roller tables. Aided by the increased motor frame, these specialist motors feature larger bearing and shaft diameters than comparable industrial motors, which contributes to higher load handling and longer life in extreme environments. Additionally, the IC410 totally enclosed, non-ventilated design offers better protection against dust, dirt or water splashing.
Nord motors suited to other areas of metals production feature TEFC (totally enclosed, fan cooled) designs with horizontal cooling fins in cast iron housings to ensure maximum absorption of vibration and shock, with protection options to IP66. Typical duty classes in steel plants are S5 or S9. A wide choice of integrated brakes and heavy-duty encoders is also available. IE2 and IE3 efficiency level motors help to reduce operating costs and raise performance, with the added advantage of an increased start-up and breakdown torque, and improved safety factors and extended life.
Nord gearboxes with Unicase one-piece housings provide higher strength and much less deflection than fabricated gearbox designs, with minimal sealing that eliminates the potential for oil leakage under high load conditions. The complete range includes shaft-, foot- and flange-mounted gear units in helical, parallel shaft and bevel designs, with torque output ratings to 50,000Nm, as well as industrial gear units that comprise modular subassemblies including a large single-piece Unicase gearbox, motor and coupling mounted on a swing base for torque output to 200,000Nm. Reinforced shafts, special anti-corrosive paints, Quadralip sealing for high temperatures, labyrinth seals for increased protection and reinforced bearings are just a few of the many options available through the complete range.
Nord frequency inverters include the SK500E cabinet range for power ratings up to 160kW and the decentralised SK200 range for ratings up to 22kW. Both include all of the common bus systems for integration into automation systems with innovative safety technology and ATEX versions available, as well as servo systems with electronic gearbox functions.
