It is not always possible to enhance the dynamic behaviour of a machine tool with the use of a linear direct drive. If the application requires only short moves at low weight an effective use of linear direct drives is possible. In contrast to that large machine tools need to move high weights over a long distance. This limits the possible application range for linear direct drives.
As an alternative solution it is possible to use a redundant, highly dynamic additional actor with a short range:
This structure is very similar to the well known Fast-Tools. Using the superposition of the basis axis (U) and the auxiliary axis (R) a higher acceleration at the contact point between tool and workpiece can be achieved.
To use the full potential of this arrangement it is not sufficent to control both axes. It is also necessary to find a way to divide the forecasted movement and to consider the capabilities of both axes. At the moment the development of possible procedures for the movement division in combination with suitable control systems is a field of research which is supported by the DFG (German Research Foundation).
The testbench-control is preformed by with a rapid-control-prototyping system from dSpace™. This offers the option of testing the control-algorithms in Matlab/Simulink with a model of the testbench. Afterwards, the testbench-model is replaced by the dSpace™-interface so that the control-algorithms can be verified and optimized using the real testbench.
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