Solution
The new design of the actuator focussed on a radical reduction of the moving masses. For this reason, two 10mm CFK tubes were selected as guide elements and a CFK front plate. By using these materials, the constructive moving masses could be reduced from 263 grams to 45 grams compared to the conventionally (steel) designed HighDynamic linear motor module. An increase in acceleration values is only possible through a radical reduction in mass.
With regard to the selection of a suitable bearing for guiding the CFK tube, the decision was made in favour of
iglidur J bearings, whereby a total of four bearing bushes were installed in two bearing blocks (see picture below).
With these components, the newly designed actuator can, for example, implement a stroke of 160mm in just 60ms travel time, controlled by the path curve. During such a movement, speeds of 4m/s and accelerations of 200m/s
2 (20g) are achieved even on this short stroke. The pure acceleration or the braking process is already completed after a travel distance of 40mm.
In order to be able to make a statement about the long-term practical suitability of this solution, an endurance test series was started at Jung Antriebstechnik, in which the new actuator was tested under very real conditions. This showed that even after several million lifting cycles and a running distance of several thousand kilometres, no significant abrasion and wear could be detected on the CFK tubes and on the iglidur J bearings. Due to the positive results of the tests, the product was presented to the public at MOTEK 2015 at the end of testing.