Optimal control of servo motors of high-speed presses

Servo spindle presses must provide the highest precision when supporting cutting, bending and drawing processes. The SD2 drive controller from Sieb & Meyer can make a decisive contribution to this. Up to four servo axes can be controlled synchronously with the SD2 per servo spindle press, allowing systems to be designed for a pressing force of up to 1000 kN.

Accuracy is essential for pressing applications. However, precise regulation or control is also necessary to ensure the repeatability of processes and their documentation. The SD2 drive controller from Sieb & Meyer can do this particularly well: It enables flexible process design and meets the highest requirements in terms of precision and dynamics. The SD2 also offers application-specific interfaces and functions that make it easier to develop an individual overall system.

A well-known supplier of servo lifting presses has been relying on the servo amplifiers from the Lüneburg specialists for control technology and drive electronics for more than three decades. The servo spindle presses are equipped with highly efficient AC servo motors, a powerful control system, AC servo feeds, a pinion system and the SD2 drive controller from Sieb & Meyer. The ram movement of the presses is generated by combining a servo direct drive with a thread roller drive. The special design of the drive unit means that the pressing force is available over the entire stroke.

Precise control for optimal results

The SD2 drive controller from Sieb & Meyer is an essential component of these systems. The highly precise control by the SD2 takes place via a bus converter from EtherCAT to SERVOLINK4, which Sieb & Meyer developed together with the manufacturer. In this case, up to four servo axes can be controlled synchronously per servo spindle press, allowing systems to be designed with a pressing force of up to 1250 kN.

“Each axis has its own servo amplifier,” explains Ralph Sawallisch, Key Account Manager Drive Electronics at Sieb & Meyer. "The SD2 series is designed as a multi-axis system. If several axes are moved, the central power supply module PS2 supplies the connected SD2 servo amplifiers. This results in significant energy savings compared to devices with individual power supplies. We currently offer numerous device variants in the power range from 7 to 138 kVA."

In this specific application, only water-cooled versions of the SD2 are used because the devices are exposed to ambient temperatures of > 40° C in summer. The drive controllers must also be as robust as possible in order to be able to operate around the clock under harsh industrial conditions - requirements that the SD2 meets perfectly.