Motors, gearboxes and drives for harsh environment applications
02 December 2010
For reversing rolling mills and similar harsh environment applications where high duty cycle and frequent reversals are essential requirements, Nord can supply its IC410 totally enclosed unventilated motors with straight fins but also with radial fin or ring fin cast iron housings that improve the natural heat convection from the motor.
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 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 power industrial motors, which helps contribute to higher load handling and longer life in extreme environments. Additionally the IC410 non-ventilated design offers best protection against dust, dirt or water splashing.
Nord motors suited to other areas of metals production feature 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 allow reduced operating costs and higher performance with the added advantage of an increased start-up and breakdown torque with improved safety factors and extended life.
Nord's 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 50,000 Nm as well as industrial gear units that comprise modular sub-assemblies 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.
To complete the picture, Nord's frequency inverters include the SK500E cabinet range for power ratings up to 160 kW and the decentralised SK200 range for solutions up to 22 kW. 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.
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