The new ERS rotary module from Schunk is the successor of the proven STM module. Compact dimensions, and a center hole for cable feed-through, are ideal preconditions for designing compact and orderly arranged high performance systems. It is multi-functional and can be used as a freely programmable rotary indexing table, as a workpiece support for laser welding machines, or as a axis of rotation for grippers in gantries. It is very flexible, and any intermediate position can be approached at a repeat accuracy of 0.02°. Even the use of the highly efficient module in existing systems and plants is a good alternative: If it replaces conventional pneumatic rotary modules, it can increase the energy efficiency of the plant and significantly broadens the range of usage.
The ERS is available in three sizes with diameters 135, 170 and 210 mm. It is currently the most compact electric rotary module on the market. The height of size 170 measures 66 mm, and it achieves a convincing torque of 5 Nm. An optionally integrated pneumatic holding brake ensures that individual positions can be reliably fixed. The core piece of the ERS module is a torque motor with hollow shaft, which allows the module to be lightweight, more compact, wear-free, and is extremely reliable. In contrast to rotary modules with conventional servo motors, the module has no additional interfering contours. Moreover, elasticity due to scope and friction do not apply. Therefore, dynamic, precision, and positioning resolution are increasing. The ERS module works more quietly, precisely, and efficiently than comparable servo motors. Since there is no loss of friction, the efficiency factor achieves 80%. Due to the high compact performance, operating costs can be remarkably reduced.
As regards control and regulation strategies, the user is very flexible with the ERS: beside a 560 V DC version for standard drives from Bosch or Siemens, a 48 V DC version is also available for the use with the proven Schunk-Motion-Controller MCS-12. The module can be used as a direct servo axis in a multi-axis system, and as a stand-alone rotary module for special tasks.