Compact with the sensorless Lean motor.
The system stacks the finished tube sections to the left or right of the conveyor line, depending on the quality. “Here, precise movements are less important than a compact drive design. They also have to be robust,” says STOBER expert Fabien Marinier. The Lean motor for RAVNI TECHNOLOGIES fulfills both of these requirements. It can also be used at high temperatures, as its windings can withstand up to 155 degrees Celsius.
Speed and torque can be controlled infinitely from a stalled position to maximum speed with full torque control – and the Lean motor operates completely without sensor elements. “This means that only a single-shielded standard power cable is required,” the STOBER expert explains. It reduces installation effort considerably. And because neither sensors nor fans are installed, it is also significantly more robust. With an efficiency of up to 96 percent, this series achieves energy efficiency class IE5.
“To reduce the space required in the control cabinet and thus cut costs, we rely on the multi-axis drive controllers of the SI6 series,” explains commissioning engineer Romain Forgeron. These drive controllers are suitable for high-efficiency multi-axis applications, among others. At a slim 45 millimeters, the highly dynamic drive component works inconspicuously and reliably in the background, even during demanding movements. STO (Safe Torque Off) and SS1 (Safe Stop 1) functions are integrated.
In the SI6 series, these are certified for PL e, cat. 4 in accordance with EN 13849-1 and can be used without function tests that interrupt production. A single drive controller can control up to two axes. “We have installed several SI6s. With two double-axis drives and one single-axis drive, for example, we can control seven motors,” says Fabien Marinier.
By stringing together several of these components, the number of axes to be controlled can be scaled as needed. Quick DC-Link modules connect the individual devices with each other and with the PS6 central supply module quickly and easily. This highly dynamic series achieves short recovery times with fast set value changes and load jumps. The existing Siemens PLC communicates with the STOBER drive controllers via PROFINET.
Romain Forgeron from RAVNI about the drive controller:
Romain Forgeron from RAVNI TECHNOLOGIES is enthusiastic about the solution. “STOBER supplied us with the right motors for all 18 axes of the overall system, right down to the drive controllers – for both simple and complex axes as well as for the winding station.” The drive specialists provided support from the selection of components up to commissioning on site.
STOBER technicians made final adjustments to make the production line even more efficient. Forgeron is satisfied with the cooperation with the STOBER team. “The exchange of information went smoothly. This allowed us to move the project forward more quickly. When there were difficulties, they were quickly resolved. So I was even able to treat myself to a relaxing weekend in Manhattan.”