Good idea
Klinkhammer saves energy with supercaps on storage and retrieval machines
Klinkhammer has equipped the storage and retrieval unit of its automatic small parts warehouse with energy-saving capacitors as a storage medium. The system can be seen as a demonstration unit in the new Klinkhammer technical center. This means that Klinkhammer can now offer its customers this technology for storage and retrieval machines and save up to 40 percent energy. In addition, the reduced peak currents on the supply side mean that both the power supply lines and the transformer station can be smaller.
The new technical center of Klinkhammer Intralogistics GmbH is equipped with a storage system in which the braking energy of the stacker crane is temporarily stored directly in the drive system for the next acceleration phase. This is made possible by using supercaps as a storage medium. The capacitor bank used here can store up to 620 kWs of electrical energy. This technology allows the operator to save up to 40 percent energy, as the energy is not lost as heat in the braking resistor during braking, but is stored locally and made available again for the next acceleration process. Grid power peaks during acceleration can be absorbed by the stored recuperation energy, thereby reducing grid perturbations and improving grid quality. Infrastructure such as UPS and system components such as control cabinets or fuses can also be designed smaller and therefore offer potential savings.
Supercaps can be installed in both automated bin storage systems and automated high-bay pallet warehouses. Supercaps are capacitors with a high power density. Compared to normal electrolytic capacitors, they have a much higher capacity. Compared to lithium-ion batteries, they offer significantly more peak power and a longer service life.
In the case of storage and retrieval machines in cold storage areas, the capacitor storage unit pays for itself particularly quickly, as the regenerative energy is not converted into thermal energy, as is usually the case with braking resistors, which then has to be compensated for by the cooling system with additional energy input. Another interesting application is the modernization of existing storage and retrieval machines. In the case of retrofitting, the local capacitor storage unit offers the possibility of accelerating more dynamically or moving higher loads without changing the mains supply infrastructure.
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