A new type of modular linear drive unit with integrated position sensing can dramatically simplify the building of gantry and XYZ handling systems. Using new IP67-rated industrial linear motor technology, linear stages can be bolted together in minutes to produce a rugged multi-axis configuration.
Compared with traditional ballscrew-based linear stages, a Servotube-based linear stage is said to be much simpler, consisting of a single off-the-shelf unit with only two parts: the forcer (the coils) and the thrust rod (permanent magnets).
Because direct-drive actuation is used, there is no need to integrate and align a gearhead, servomotor and ballscrew, thereby saving valuable engineering time.
Backlash between, say, a screw and a nut or gearhead teeth is avoided by using tubular direct-drive technology, resulting in an excellent repeatability of just 12microns. Eliminating the mechanical drivetrain also dramatically improves speed to 10m/s, which compares favourably with belt drives, but the technology delivers a more dynamic response reliably and with higher accuracy.
External position encoders require precise alignment, extra wiring and mounting area, all of which occupies valuable machine space. However, by using a built-in position sensor, the Servotube mechanical integration is simplified; this also allows the system to be used in a dirty environment such as bottling plant or food processing machinery.
Saving space is another benefit of tubular direct-drive technology.
