DC motor damping: A strategy to increase passive stiffness of haptic devices. (English)
Ferre, Manuel (ed.), Haptics: Perception, devices and scenarios. 6th international conference, EuroHaptics 2008, Madrid, Spain, June 10‒13, 2008. Proceedings. Berlin: Springer (ISBN 978-3-540-69056-6/pbk). Lecture Notes in Computer Science 5024, 53-62 (2008).
Summary: Physically dissipative damping can increase the range of passive stiffness that can be rendered by a haptic device. Unlike simulated damping it does not introduce noise into the haptic control system. A DC motor can generate such damping if it’s terminals are shorted. We employ a configuration of the H-bridge which can cause this damping to impart stability to our haptic device. This results in an increase in passive wall stiffness of about 33.3\% at a sampling rate of 100Hz and 16.6\% at 1kHz over the performance of an undamped DC motor. We have also attempted to implement the system on the hybrid haptic control system [1], it was seen that a perceivable change in the performance of this system was not observed by the use of DC motor damping.