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5. December 2016

Linear direct drives for belt conveyors

A novel drive concept for belt conveyors is under development at ITA in cooperation with IAL. Linear direct drives shall facilitate longer conveying distances and higher mass flows – with decreasing belt stress and tension as well as energy demand.

Whether in dispatch warehouses or in production: Conveyor belts have to transport more and more goods over increasingly longer distances. For this reason, the Institute of Transport and Automation Technology (ITA) and the Institute for Drive Systems and Power Electronics (IAL) are jointly working on alternative drive concepts (see Fig. 2).
In linear drives, feeding force is directly induced by the electromagnetic field. Thus, the belt tension and the belt stress from the motional resistance can be reduced significantly compared to conventional drives. In intralogistics, linear synchronous motors are already in use, for example in sorting systems – in contrast, for today’s belt conveyors this drive principle is not applied, yet.
Considering conventional flexible conveyor belts, the researchers pursue the principle of a hybrid motor (see Fig. 3). Combined with integrated permanent magnets, the excited stator induces a changing electric field. That way, the secondary elements are moved. They are made of magnetically soft material and are mounted to the conveyor belt. Based on this principle, the researchers developed a demonstrator (see Fig. 4). In the next step, they want to validate their development by experiments and compare it with conventional belt conveyors. 

by Mišel Radosavac

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At a glance

  • Novel drive concept for belt conveyors
  • Linear direct drive for distributed feeding force directly induced into the conveyor belt
  • Use of conventional flexible conveyor belts possible
  • Longer conveying distances and higher mass flows
ITA_Lineardirektantrieb_Bild1_Quelle_WGTL_01
Figure 1: Belt conveyor in intralogistics. (Photo: WGTL picture library)
ITA_Lineardirektantrieb_Bild2_EN
Figure 2: Alternative drive concepts for belt conveyors. (Photo: ITA)
ITA_Lineardirektantrieb_Bild3_EN
Fig. 3: Operating principle of a hybrid motor. (Photo: ITA)
ITA_Lineardirektantrieb_Bild4_EN
Fig. 4: Demonstrator with linear direct drive. (Photo: ITA)
ITA_Lineardirektantrieb_Bild5_EN
Fig. 5: Hybrid motor with guidance. (Photo: ITA)
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Dipl.-Ing. Mišel Radosavac

+49(0) 511 762-2545

Misel.Radosavac@ita.uni-hannover.de

www.ita.uni-hannover.de

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