Normal Force Actuator for a Tactile Display Using a Micromechanically Built Spring Element Made of Polyimide
M. Rechel, Leibniz Universität Hannover, Garbsen, Germany
V. Hofmann, J. Twiefel
Leibniz Universität Hannover, Hannover, Germany
M. Wurz, Leibniz Universität Hannover, Garbsen, Germany
We present a tactile display able to induce normal and shear forces into the human fingertip within the same pin. This is realised by combining an electromagnetically driven normal force actuator with a piezoelectrical driven bending actuator to induce shearing forces. To design a normal force actuator with high performance and low energy dissipation in heat a hybrid solution of micro and precision mechanics is employed. This innovative approach leads to an actuator with small dimensions in the planar level with a pin to pin distance of 2.4 mm, combined with high flux densities resulting in high forces at low applied currents. Dimensioning of the system includes geometric, mechanic, electromagnetic and thermal aspects of the normal force actuator. Characterization is done by measuring the amplitudes over a specific frequency band with a Laser Doppler Vibrometer and by determining the blocking forces with a prestressed resistance strain gauge. The results are
compared to the requirements of such a system.
ACTUATOR 2016 Manuscript B2.3
Publication date: 01/06/2016
Manuscript B2.3 published in Conference Proceedings ACTUATOR 2016
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