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Magazine
drive&control
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Highly energy-efficient package distribution system
With Rexroth’s support, Wegener + Stapel has realized a largescale package distribution system for a leading logistics enterprise. It is capable of handling up to 4,500 packages, weighing up to 32 kilograms each, every hour. One of the pivotal functions in such systems is performed by a so-called rotary diverter, which redirects packages from one roll conveyor to another. For three years now, the conveyor and handling specialists have employed Rexroth technology and know-how.
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Package distribution system
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Intelligent motors
"In view of this requirements profile, we decided to deploy the IndraDrive Mi system for the 41 rotary diverters and their drive units," recounts Karl-Heinz Gebhard, sector manager in the Rexroth General Automation division. This technology offers a wide range of advantages. Since the drives can be connected in series, wiring requirements are reduced by up to 85 per cent.
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Conveyor belt
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More performance - less energy
This sorting system sets new standards in energy efficiency: even though it uses up to 35 per cent less energy, the system's handling capacities are significantly greater than for configurations with conventional drives. This considerable enhancement in system efficiency is due to a number of factors. For example, the concept makes systematic use of the kinetic energy present in the plant.
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Rotary diverter
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Retaining energy in the system
A modern power supply concept contributes to further energy savings. This unit is capable of feeding excess power back into the mains, which means that the braking energy not used by the system is available for other uses. In a package sorting system this effect can quickly add up to savings of around 20 per cent, as a great deal of braking energy is reclaimed that would otherwise be lost in the form of heat.
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Decisive factor
Altogether, the energy-saving schemes have had a major effect: assuming 300 workdays per year and twelve hours of operation per day, the system uses around 23,400 kWh less power. At a price of € 0.12/kWh for electricity, this translates into savings of about € 2,800 and a reduction in CO2 emissions by over fourteen metric tons. Thus energy efficiency is a key competitive factor.
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