„Magnetaktor zur aktiven Dämpfung und Stabilisierung einer Luftlagerspindel für die Mikrozerspanung“ – ein Projekt zur Verbesserung der Prozessergebnisse beim Mikrofräsen

With the purely passive air bearing spindles mainly used in micromilling to date, the speed changes required for a constant feed per tooth lead to undesirable concentricity deviations of the tool and thus to shape deviations in the component. In order to achieve optimum results in micro-milling, the research project funded by the German Research Foundation (DFG) is supplementing the advantages of air-bearing tool spindles with the control options of an active magnetic bearing. In order to compensate for concentricity deviations, a single, actively controlled magnetic bearing is integrated into an air bearing spindle. This enables active damping and stabilization of the tool runout.

The development of the magnetic actuator and the associated control loop is initially model-based on the basis of investigations into the vibration behavior of the air bearing spindle. The control parameters are determined using an overall model and optimized again after the design integration of the magnetic actuator into the spindle system. The influence of the magnetic actuator is then validated in micro-cutting tests.