To best meet urgent local needs and harsh conditions with massively improved lead times, SEW-EURODRIVE is on a mission to localise its modular drive concept for a variety of industrial drive applications. Jonathan McKey highlights a few of the advantages this presents for the power generation sector.
The company’s expanded local capability from its new Aeroton facility will include the assembly of its latest X.e Series industrial gear units (IGs); its modular air-cooled condenser units (MACCs); standard, VSD- and servo-driven gearmotors; along with customer specific drive-train packages. For the power industry these include conveyor, cooling tower and ash drives; girth-gear solutions; fans; pump drives; and many other purpose-built modular solutions.
X.e Series gear units
Modular X.e Series units, the latest evolution in the IG range, are now even more robust, reliable, efficient and easy to maintain than their predecessors. Significantly increasing the number of possible torque/speed combinations and fine-size graduations enables solutions to be custom-built to suit client specification precisely. Additional modular features and options include motor adapters; integral and load sharing backstops; sealing; and shaft systems. All these add to the ease of use and reliability of X.e Series drive solutions.
The X.e series offers an optimised choice of gear unit sizes, reduced gear unit weight and sufficient centre distances. In addition, when the drive needs to be operated at low speed during maintenance, for example, the drive package can be equipped with a directly mounted slow-speed auxiliary drive to advance the system while the main drive is switched off.
The new X.e range is also ideal for girth gear applications, where the new generation units have become the global standard for use with the company’s segmented mill drive solution.
MACC Series drives
MACC drives are purpose designed for driving the modern fan-based air-cooled condenser (ACC) systems used in steam-driven power generation plants. ACCs need to generate huge air flows to cool and condense exhaust steam from turbines. “Our modular air-cooled condenser (MACC) drives have specific optimisations to make them tailor-made to best suit these applications,” McKey explains. “These include a stiffer case with built-in cooling veins for improved cooling; the internal extended bearing distance (EBD) system, which better enables the gearbox bearings to accommodate the very high axial and radial forces transferred through the fan; and the drive shaft.
“These are compelling reasons for power stations to replace faulty ACCs with our MACCs. To make this easier for plant operators, we build customised adapter plates to enable our design to be easily retrofitted as a direct replacement for any older-generation boxes currently in use. We also customise the output shaft length to perfectly match the ACC infrastructure onsite and to establish the ideal fan position for maximum efficiency,” he continues.
The typical lead time for imported large industrial gearboxes by most gearbox OEMs can range from 18 to 24 weeks or more. Once the company’s assembly plant is complete and operational, it will be able to assemble most common modular designs locally at capacities of approximately three to five per week.
Electric motors, gearmotors and VSDs
Supporting drive trains for the power generation and other industrial sectors are the SEW electric motors, which are available in the power range from 0,09 to 375 kW, and in efficiency classes IE1, IE3 and IE4. “Our IE3 DRN motors have now replaced our IE2 range, and we can also supply premium efficiency DRU motors which meet IE4 efficiency requirements if requested,” notes McKey. “All of these motors are directly compatible with SEW’s modular approach to drive packages, either in combination with an industrial gear unit – as directly coupled to a helical or bevel-helical gear unit or as part of a complete drive package on a base-plate – or fully incorporated into a gearmotor unit.”
SEW-EURODRIVE’s inverters, controllers and other electronic systems, including AGVs, will also be locally assembled in a clean and static-free area of the new Johannesburg factory. These are perfectly tailored to control the speed, torque and application-specific functions of drive systems to get the most out of the company’s modular drive trains and gearmotors in terms of energy efficiency and functionality.
“Local assembly of these modular systems demonstrates our commitment to being part of solving South Africa’s long lead supply problems, while also attracting business from across the world from those experiencing long delays in meeting urgent needs,” McKey concludes.
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