Siemens Mining Technologies Introduces New Generation of Shovel Drives
The new smaller drives were developed to meet market requirements for smaller yet efficient mining machines in the developing and fast-growing mining regions of India, Brazil, China and Russia. With over 30 years' shovel AC drive experience, Siemens Mining Technologies has created drives that operate faster and more efficiently than DC drives. The AC induction motors allow higher stall torque, faster acceleration and higher speeds in field weakening to deliver a larger area under the speed/torque curve and shorter machine cycle times.
These latest shovel drives will use the same water-cooled Insulated Gate Bipolar Transistor (IGBT) drive system supplied with haul trucks and Bucyrus' large rope shovels and walking draglines. By creating a single drive design platform for shovels, draglines and haul trucks, costs associated with operations, training, maintenance and support are substantially reduced. The IGBT technology has been shown to be capable of operating above 98% availability with Mean Time between Failures (MTBF) in the thousands of hours and a Mean Time to Repair (MTTR) of typically less than one hour.
The IGBT inverters, controlled by an updated control platform Sibas 32S platform, transform DC power at a constant voltage into AC power a variable frequency and voltage to drive the shovel motors. Unlike DC motors, AC motors have no brushes or commutators that must be maintained. IGBT power and digital Sibas control modules require no routine maintenance. They have a high overload capacity, which allows electronic protection circuits without fuses to greatly increase reliability. These latest shovels also include an updated speed sensor (tooth wheel with magnetic pickup sensor) that will be become the standard for all future shovel, dragline and truck designs.
The Siemens Industry Sector (Erlangen, Germany) is the world's leading supplier of production, transportation and building systems. Integrated hardware and software technologies combined with comprehensive industry-specific solutions enable Siemens to enhance the productivity and efficiency of its customers in industry and infrastructure. The Sector comprises six Divisions: Building Technologies, Industry Automation, Industry Solutions, Mobility, Drive Technologies and Osram. In fiscal 2007 (ended September 30), Siemens Industry generated sales of approximately EUR40 billion (pro forma, unconsolidated) with around 209,000 employees worldwide. http://www.siemens.com/...
With the business activities of Siemens VAI Metal Technologies, (Linz, Austria), Siemens Water Technologies (Warrendale, Pa., U.S.A.), and Industry Technologies, (Erlangen, Germany), the Siemens Industry Solutions Division (Erlangen, Germany) is one of the world's leading solution and service providers for industrial and infrastructure facilities. Using its own products, systems and process technologies, Industry Solutions develops and builds plants for end customers, commissions them and provides support during their entire life cycle.
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