Siemens Mining Technologies Introduces New Generation of Shovel Drives

(PresseBox) ( Munich, )
Siemens announces a new drive designed for smaller electric mining shovels with a 20-30 m3 bucket load. In conjunction with Bucyrus International, Inc., Siemens has received orders for several of these new units to be supplied on machines destined for operations in Asia and South America. Additional orders are expected for delivery over the coming year.

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.
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